Building a motion simulator should lead to great racing. But between the first moving platform and a dependable rig, many builders encounter the same frustrations: a battery they would rather not have indoors, motors that stop responding, overheating components, and wiring that becomes increasingly difficult to troubleshoot.
Energy360 grew out of that experience. The battery was the biggest hurdle. Then came motor issues, dropouts, burnt-out motors, and the challenge of bringing all the wiring together into something understandable and maintainable.
A battery-free motion simulator is achievable. The key is to plan the power supply, regenerative energy handling, motor control, capacitor charging, and feedback wiring as one connected system.
The first hurdle: why does my simulator need a battery?
A battery can serve useful purposes in a motion system. It can supply brief bursts of current and accept energy returned by the motors. That helps explain why batteries appear in many DIY simulator designs.
However, installing one also introduces considerations that go well beyond finding somewhere to put it.
Lead-acid batteries are heavy, occupy space, require appropriate charging, and eventually need replacement. They also introduce acid and gas hazards into an installation that may sit in a spare bedroom, basement, or games room.
Lead-acid batteries can release flammable hydrogen. If ventilation is poor, that gas can accumulate and form an explosive mixture. The electrolyte is corrosive, and a short circuit across the terminals can release substantial current.
These concerns depend on battery type and operating conditions. Different battery chemistries have different requirements and risks.
For Energy360, the question was straightforward:
Could we build a dependable motion simulator without keeping a battery alongside it?
The answer required more than disconnecting the battery. We needed to account for the jobs it had been doing.
Choosing the right power supply: power quality affects motion quality
A power supply can make a simulator move without being well suited to the demands of realistic motion.
It is tempting to choose a supply by voltage, advertised wattage, and price. But a motion simulator presents a rapidly changing load. Motors accelerate, reverse, resist the weight of the platform, and respond to changing commands—sometimes across several axes at once.
The supply must support those demands while maintaining a stable output. Its wattage rating is only part of the picture.
A rig that moves is not necessarily responding correctly
Two supplies with similar power ratings can behave differently when the load changes suddenly. Transient response describes how a supply responds to those changes, including how far its voltage drops and how quickly it recovers.
If the available voltage falls or the system reaches a current limit, the motors may no longer deliver the acceleration requested by the motion controller. Larger disturbances can cause protection trips, interruptions, or a brownout of connected electronics.
The less obvious problem is a rig that keeps moving but struggles to follow its target.
Instead of a crisp, well-timed response, the driver may feel delayed, softened, or inconsistent movement. The controller is asking for motion that the electrical system cannot deliver at that moment.
For someone seeking realistic simulation, this matters. A braking cue, traction-loss event, or rapid direction change needs to arrive at the right time. Movement that lags behind the event can feel sluggish or unnatural.
The goal is to reproduce the requested motion consistently—not simply to keep the platform moving.
An unsuitable supply can become an expensive compromise
An undersized or poorly matched supply may repeatedly enter current limiting, shut down, or struggle thermally during demanding sessions.
Operating beyond its specified limits, with inadequate cooling, or without suitable management of returned motor energy can stress the installation and contribute to premature failure. A properly functioning supply may protect itself by shutting down instead, but repeated shutdowns still leave the builder with an unreliable simulator.
These symptoms can also send troubleshooting in the wrong direction. Builders may change PID settings, replace motors, or reduce motion intensity when the power system is part of the limitation.
Before trying to tune around weak or inconsistent movement, establish whether the supply voltage remains stable under load.
Why Energy360 uses compatible server-grade supplies
Compatible server supplies such as the Dell L1100A family provide a practical foundation for Energy360 builds: substantial 12 V output capacity in a compact package, with dedicated cooling and control features.
Server equipment operates under demanding electrical loads, making this class of supply worth considering for a motion system. However, the exact model still matters. Output regulation, transient performance, ripple, protection behaviour, and available power must be checked for the particular unit and installation.
Low electrical noise is also desirable, especially around sensitive control and feedback circuits. Supply ripple is only one contributor, though. Motor switching, grounding, cable routing, and feedback wiring still need careful attention.
A suitable server supply is one part of a well-designed power system. Its nameplate alone does not establish the performance of the complete rig.
Match the supply to the complete installation
When choosing a power supply, consider:
- Operating voltage: compatibility with the motors, controller, and other components.
- Continuous output: sufficient capacity for sustained operation, with appropriate headroom.
- Changing loads: voltage stability and recovery during sudden current demands.
- Protection behaviour: what happens during overload, overheating, or abnormal voltage.
- Cooling and condition: adequate airflow, clean fans, and the condition of refurbished equipment.
- Connections: suitable terminals, cable sizes, and secure mounting.
- Regenerative energy: a deliberate way to handle power returned by the motors.
The supply must also work with the capacitor bank and its charging arrangement. Capacitors can buffer short events, but they cannot compensate for a sustained shortage of power.
Likewise, server-grade construction does not mean a supply can safely absorb regenerative energy. That requirement must be addressed separately through the controller’s supported configuration and suitable components.
Validate performance during real motion
Check the system during representative acceleration, reversals, and simultaneous axis movement—not just while stationary or moving gently.
Observe supply voltage, controller status, motor response, and temperatures. Brief disturbances may require measurement equipment capable of capturing them; a steady reading on a basic meter does not necessarily reveal every transient.
Reliable, believable motion begins with a power system that can deliver the response the controller requests.
Understand the two directions of power flow
It is easy to think of a simulator as a system in which electricity flows from the power supply to the motors.
During motion, energy can also travel in the other direction.
When a motor slows a moving load, or the mechanism drives the motor, it can act as a generator. A regenerative motor controller can return that energy to the DC power bus.
Many power supplies are designed to deliver power, rather than absorb returned energy. A battery-free system therefore needs a suitable way to manage regeneration.
For example, the Sabertooth 2×32 supports battery-free operation using its configurable auxiliary outputs with correctly selected regenerative clamp resistors. The controller’s configuration and resistor installation must follow its documentation.
The power supply feeds the system. The regeneration circuit handles returned energy. Both need to be planned.
The next hurdle: motors that drop out—or burn out
A rig may move correctly during a gentle test and then lose motion during a demanding corner, a fast reversal, or an extended session.
That is frustrating, particularly when the fault disappears before you can identify it.
In our own development, motor dropouts and burnt-out motors became major obstacles. They also reinforced an important lesson: similar symptoms can have different causes.
A motor that stops responding might be affected by a supply interruption, controller protection, a connection fault, feedback problems, or a motor fault. Excessive mechanical loading and unsuitable control settings can create further problems.
Replacing components without understanding the cause can become expensive.
A better approach is to examine the complete system:
- Do the motor and gearbox suit the moving mass and lever geometry?
- Can the power supply support the expected load?
- Are current limits appropriate for the motor and installation?
- Is the linkage free to move throughout its intended travel?
- Is position feedback stable and correctly configured?
- Are cooling and ventilation adequate?
- What happens to voltage, current, feedback, and controller status when the fault occurs?
Removing the battery does not automatically solve motor problems. Dependable operation also requires suitable mechanics, motor selection, protection, and tuning.
What a capacitor bank contributes
A motion simulator’s power demand changes rapidly. Acceleration and changes in load can produce brief current demands that are much higher than the average.
A capacitor bank provides a short-term energy buffer on the DC bus. It can contribute current during brief events and help reduce sudden voltage changes.
Its capacity is finite. It cannot sustain a motor load indefinitely, and it does not make a continuously undersized power supply adequate.
It also does not replace the need to manage regenerative energy.
Think of these as separate responsibilities:
- Power supply: provides the operating power.
- Capacitor bank: buffers short-duration changes in demand.
- Regeneration circuit: manages energy returned by the motors.
The components must be selected and configured to work together.
Solve startup before adding more capacitance
A discharged capacitor bank presents another challenge: charging it.
Connecting a large discharged bank directly to a supply can create a substantial inrush current. If the supply cannot support that initial demand, its output voltage may fall or protection may activate.
Controlled charging limits the initial demand while the bank charges, before establishing the normal operating connection.
Energy360’s main-board capacitor control and soft-charge components are designed to manage this startup process as part of the complete system.
Adding capacitance should be a planned change, with suitable charging control, voltage ratings, wiring, and protection.
Position feedback: the controller can only respond to what it measures
A motion controller needs to know where the mechanism actually is. It compares the requested position with the measured position and adjusts motor output to reduce the difference.
If that measurement is noisy, inconsistent, or mechanically inaccurate, the controller is working from misleading information.
The result can be unnecessary corrections, jitter, inconsistent positioning, or difficulty tuning the rig. Increasing motor power or changing PID settings cannot repair a slipping sensor connection or an unreliable feedback signal.
Good motion starts with a trustworthy measurement of position.
Why choose a Hall-effect position sensor?
A conventional resistive potentiometer measures position using a moving contact, or wiper, on a resistive track. This is simple and economical, and a quality position-feedback potentiometer can perform well.
However, a simulator repeatedly moves through the same operating region. Over time, contact wear or contamination can affect the signal.
A Hall-effect rotary position sensor measures a magnetic field instead of relying on a sliding electrical contact. Removing that contact eliminates a source of wear in the sensing element—an important advantage for a mechanism that continually changes direction. Shaft bearings and mechanical couplings still have their own service-life limits.
For a new build, a suitable Hall-effect sensor is worth considering for its contactless operation and potential for consistent performance over repeated movement.
But “Hall effect” alone does not establish accuracy. Check the sensor’s specified linearity, repeatability, temperature behaviour, response time, and electrical output. Magnetic alignment also affects performance, particularly in designs where the builder installs the magnet separately.
Linearity, accuracy, and resolution are different things
These terms describe different parts of measurement quality:
| Property | What it means for the simulator |
|---|---|
| Linearity | How closely the electrical output follows the intended position relationship throughout the travel. |
| Accuracy | How closely the reported position agrees with the actual position. |
| Repeatability | Whether returning to the same physical position produces the same reading. |
| Resolution | The smallest change the complete measurement system can distinguish. |
| Latency | How much time passes before a position change appears in the feedback reading. |
A sensor can provide a smooth-looking signal while still reporting position inaccurately. Likewise, a high-resolution sensor does not guarantee a high-resolution result if the controller’s analogue input, wiring noise, or mechanical backlash becomes the limiting factor.
Choose an electrical measurement range that suits the mechanism’s actual travel. Using only a small fraction of the sensor’s output range also uses only a fraction of the controller’s available input range.
Check the complete signal path, including sensor supply voltage, output voltage range, controller input limits, and reference arrangements.
Mechanical mounting is part of the measurement
Even an excellent sensor will give poor results if its bracket moves or its shaft connection slips.
The sensor should measure the intended motion without supporting the mechanism’s load. Its mounting needs to remain rigid relative to the part being measured.
Aim for closely aligned shaft centre-lines. Avoid forcing the sensor shaft sideways or pushing and pulling it along its axis. Check that the mechanism cannot drive the sensor beyond its permitted travel.
A sound installation needs:
- A secure bracket that resists movement and vibration.
- A coupling that grips both shafts without slipping.
- Minimal backlash when the direction reverses.
- Clearance throughout the mechanism’s travel.
- Cable strain relief that does not pull on the sensor.
A small amount of movement in the mounting can look like a position error to the controller.
Where a universal joint helps
A suitable universal joint can accommodate angular misalignment between the driving shaft and sensor shaft, making the connection less mechanically demanding than forcing misaligned shafts into a rigid coupling.
Keep the working angle small and align the shafts as closely as practical. A joint should accommodate the remaining misalignment, rather than compensate for an avoidably poor mounting arrangement.
Check the coupling’s capabilities: accommodating angular misalignment does not automatically mean it accommodates parallel shaft offset or axial movement.
Also consider the joint’s effect on measurement. A conventional single universal joint operating at an angle does not maintain a perfectly uniform input-to-output angular relationship. Larger angles can therefore introduce an additional position-mapping error.
After assembly, slowly move through the intended travel and check for binding, shaft loading, backlash, and changes in alignment.
The sensor connection needs to transmit position faithfully while allowing the mechanism to move freely.
Explore the universal joint kit ↗ · Explore sensor mounts ↗
Treat feedback wiring as measurement wiring
A position-feedback cable carries information that the controller uses to move the rig. Route and terminate it with that responsibility in mind.
Use good-quality shielded twisted-pair cable with suitable flexibility and secure connections. Twisting a signal conductor with its intended return reduces the loop area that can pick up interference. Shielding addresses another part of the interference problem; its effectiveness depends on correct termination.
Follow the board’s wiring plan for conductor pairing and shield connections. A twisted pair connected to a single-ended input does not gain the same noise rejection as a properly designed differential receiver.
Keep sensor wiring separated from motor leads and other high-current switching circuits where practical. Avoid long parallel runs, unsupported connections, and cables that repeatedly flex at a terminal.
The shield or drain wire should not substitute for the designated sensor return conductor.
Explore shielded position-sensor cable ↗
Ground loops and shared return paths
A feedback signal is measured relative to an electrical reference. If unwanted current changes that reference, the controller may interpret the disturbance as a position change.
Multiple ground connections can create unintended current paths. Motor current sharing part of a sensitive sensor return can also introduce measurement error.
Plan the relationship between sensor return, controller ground, supply negative, chassis, cable shields, and USB connections. Avoid adding ground connections experimentally without understanding the paths they create.
Shield termination depends on the installation and interference frequencies involved. Follow the documented grounding arrangement rather than applying a universal rule that every shield must be connected at one end—or both ends. Protective-earth connections must remain intact.
Apply instrumentation-style calibration
A dependable feedback system deserves more than setting its endpoints and assuming the middle is correct.
Use the same disciplined approach expected of a measurement system:
- Establish the mechanics. Secure the mounting, check alignment, and remove slipping or excessive backlash.
- Verify the electrical range. Confirm that the sensor output remains within the controller’s permitted input range.
- Confirm direction. Check that feedback changes in the expected direction before enabling closed-loop movement.
- Set usable limits. Leave appropriate margin before mechanical stops and sensor limits.
- Check intermediate positions. Compare readings with independently measured physical positions throughout the travel.
- Check both directions. Approach the same positions from opposite directions to reveal backlash or hysteresis.
- Check under operating conditions. Compare stationary readings with readings during motor operation, and repeat after the system warms up.
- Record the results. Keep the sensor model, wiring arrangement, calibration values, and observations with the build documentation.
Endpoint calibration corrects the overall range and offset. It does not automatically correct nonlinearity, coupling geometry, backlash, or electrical noise.
“Instrumentation-style” describes this careful process. Claims of instrument-grade accuracy require measured results and an appropriate reference.
Reliable feedback supports believable motion
The sensor, mounting, coupling, wiring, controller input, and calibration form one measurement system. A weakness anywhere in that chain can limit the result.
Choose a suitable sensor, connect it without mechanical strain, preserve its signal, and verify what the controller actually sees.
That gives tuning a sound foundation—and helps the simulator reproduce the motion being requested.
Then comes the wiring nightmare
Once the platform moves, the wiring often grows around it.
A power connection is added here. A sensor cable is extended there. A temporary terminal block becomes permanent. Wind fans, emergency-stop connections, and extra axes introduce more cables.
Eventually, a simple question—“Where does this wire go?”—can take far too long to answer.
Motion rigs combine high-current motor wiring with sensitive position-feedback signals, USB connections, and control electronics. Poor routing, insecure connections, and unclear grounding arrangements make troubleshooting harder.
The goal is a layout you can understand, test, and service months or years later.
That means:
- Clearly identified connections and documented cable routes.
- Appropriate separation between power wiring and sensitive signals.
- Suitable feedback cable and shielding arrangements.
- Strain relief so movement does not pull on terminals.
- Secure mounting with room for airflow and maintenance.
- Wiring protected against rubbing, pinching, and repeated flexing.
Purpose-built connection boards can bring these details together and reduce the amount of improvised wiring around the controller.
Circuit protection: protect both motor leads
Both wires between a reversing motor controller and the motor need to be considered in the protection plan. The controller reverses the voltage across these leads to change motor direction, so neither lead is a permanent negative return.
In the recommended Energy360 configuration, fit one 30 A DC circuit breaker in each motor lead—two breakers per motor. This provides overcurrent protection on both motor leads. Choose protection suitable for the wiring, equipment, DC voltage, and available fault current, and follow the wiring plan for your build.
Circuit breakers are part of the protection system; they do not replace correctly configured controller current limits, suitable wiring, or motor-temperature checks.
A practical route to a battery-free build
1. Define the mechanical demands
Start with the moving mass, number of axes, intended travel, linkage geometry, and motor requirements. These decisions influence the electrical system.
2. Choose the controller and supply together
Confirm compatibility, operating voltage, current requirements, protection behaviour, and the manufacturer’s provisions for battery-free operation.
3. Plan regenerative energy handling
Identify how returned motor energy will be managed. Select and install the required components according to the controller documentation, including their heat-dissipation requirements.
4. Plan capacitor buffering and startup charging
Choose the bank configuration for the system voltage and intended use. Include a suitable controlled-charging arrangement.
5. Design the wiring before assembling it
Map the power, motor, sensor, control, and emergency-stop connections. Plan the enclosure, cable routes, strain relief, ventilation, and circuit protection.
6. Commission the system progressively
Verify wiring and feedback before demanding motion. Confirm motor direction, sensor direction, travel limits, and stop behaviour. Begin with conservative settings and increase demands gradually.
7. Validate it under representative use
A rig moving successfully once is the beginning. Check temperatures, connections, supply behaviour, and repeatability over longer sessions. Record settings and investigate faults before increasing the load.
Where Energy360 fits
Energy360 provides purpose-built boards, mounts, wiring accessories, and kits for DIY motion simulator projects.
The main circuit board brings the Sabertooth 2×32, Arduino Uno R3, position-feedback connections, and other system connections into a defined layout. Depending on the selected configuration, it also supports capacitor-bank control, soft charging, emergency-stop connections, and wind simulation.
Power-interface boards provide connections for compatible server supplies. Capacitor banks, resistor kits, sensor boards, and mounting hardware help complete the installation.
These components support a more organised build. They work alongside appropriate motor selection, mechanical design, controller configuration, and careful commissioning.
More time on the sim
For us, the journey started with wanting to remove the battery. Motor problems and wiring frustration then showed how closely the rest of the system was connected.
The result is an approach built around managing power properly, making connections clearer, and keeping the finished rig serviceable.
Build the system thoughtfully, understand how its parts work together, and give yourself more time to enjoy the simulator.