Build a Mini Motor Dyno Using SOLO
More than 60% of electric motor projects fail at the prototype stage due to lack of proper testing. This simple but powerful insight tells us that motor testing is not optional—it’s essential.
If you’re a robotics developer, a DIY enthusiast, a university engineering student, or part of a startup designing electric vehicles, understanding how your motors perform under load is critical. And the best way to do that? Build a mini motor dyno using the SOLO Motor Controller.
What Is a Mini Motor Dyno?
A mini motor dyno is a small-scale motor testing setup used to measure:
- Torque (Nm)
- Rotational speed (RPM)
- Electrical current (A)
- Voltage (V)
- Mechanical and Electrical Power (Watts)
- Efficiency (%)
- Motor heating and stability under load
Using a motor dynamometer helps you analyze how your motor behaves under different loads, speeds, and control methods. A mini version is compact, budget-friendly, and perfect for labs, home workshops, or prototyping setups.
Why Use the SOLO Motor Controller?
The SOLO Motor Controller is a compact, intelligent, and plug-and-play motor controller that works with:
- DC Brushed Motors
- BLDC Motors
- PMSM Motors
It supports both sensor-based and sensorless Field-Oriented Control (FOC), offering precision, flexibility, and real-time feedback, making it the perfect match for building your own motor dyno.
Complete Guide: How to Build a Mini Motor Dyno Using SOLO
Materials and Components
| Component | SOLO Motor Controller | Test Motor | Load Motor | Torque Sensor | Encoder / Rotational Speed Sensor | Power Supply | Data Logger / SOLO Studio GUI | Mechanical Frame & Couplings | Cooling Fan or Heat Sink |
|---|---|---|---|---|---|---|---|---|---|
| Purpose | Controls and monitors the test motor | Motor under examination | Acts as the brake to simulate load | Measures torque generated by the motor | Tracks the speed of the motor shaft | Powers both the test motor and load motor | For visual monitoring and logging performance data | Mounts and aligns both motors and sensors | Prevents overheating during long test sessions |
Mechanical Assembly and Wiring Overview
- Mount both motors on the frame: Use stable rigid construction like a T-Slot plate
- Mount a Torque Sensor and attach it between test and load motor shafts using couplings
- Add a Rotational Speed Sensor to test motor shaft
- Connect SOLO Motor Controller to your test motor
- Connect Power Supply to SOLO and load motor (through another SOLO or different driver), check that the power matches voltage/current requirements for both motors
- Make sure that the system has any safety loop to prevent mechanical failures during tests (Use SOLO Safe Torque Off or learn more about safety in our articles)
- Use SOLO Studio GUI via USB or UART to configure parameters and view live data
- For testing use manual control via SOLO GUI or either a specific test profile can be provided using CAN line
Applications of a Mini Motor Dyno with SOLO
| Use Case | Motor Research & Development | Education & Learning | DIY Robotics | EV Prototyping | Quality Control |
|---|---|---|---|---|---|
| How It Helps | Validate performance under load conditions | Perfect for labs and courses on mechatronics or motor control | Helps hobbyists tune motors for mobile robots and drones | Test motors for e-bikes, scooters, and small electric vehicles | Ensure motors meet torque, speed, and thermal criteria |
Advantages of Building a Mini Motor Dyno Using SOLO
| Feature | SOLO Test Bench Software | FOC Sensorless + Encoder Modes | Real-Time Data Monitoring | SOLO Studio GUI | Multi-Motor Compatibility | Safe and Scalable | Cost-Effective |
|---|---|---|---|---|---|---|---|
| Advantage | Works in parallel with load side motor controllers and provides logging and real time data acquisition for such characteristics like: Rotational Speed (RPM), Mechanical Torque (Nm), Consumed Current (A), Lane Voltage (V), Mechanical and Electrical Efficiency (%), Temperature (C) and others | Flexible setup based on budget or precision needs | Adjust control strategies and see immediate feedback | User-friendly interface for beginners and pros alike | Supports DC, BLDC, PMSM motors out of the box | Small form factor, over-current and over-temperature protections built-in | Much cheaper than lab-grade dynamometers |
Dyno Build Challenges (and How to Solve Them)
| Challenge | Mechanical misalignment | Data noise from sensors | Load motor control complexity | Heat buildup in motors or controller | Torque sensor cost or inaccuracy |
|---|---|---|---|---|---|
| Why It Matters | Can cause vibration, which affects test results and damage couplings and motors | Leads to incorrect efficiency readings | Can over-brake or under-brake the test motor | Shortens test time, may damage electronics | May distort performance testing |
| How to Solve It | Use rigid frame and precision mounts | Use shielded cables and grounding techniques | Use matching load motor to allow the test motor show its full performance | Add fans, heat sinks, or even water cooling if necessary | Ensure sensor range matches the measurement limits to prevent over- or under-saturation errors |
Pros and Cons Summary Table
| Pros | Professional-grade motor testing at low cost | Modular and easy to expand | Live monitoring and adjustable parameters | Accurate testing of motor torque and efficiency | Compatible with multiple motor types |
|---|---|---|---|---|---|
| Cons | Requires basic understanding of mechanical system building and electrical wiring | Needs careful alignment to avoid extra mechanical stress | Setup can be time-consuming for absolute beginners | Limited by sensor quality and load motor response | High-speed or high-power testing requires additional safety |
Educational Tip: Understanding Key Motor Dyno Terms
| Term | Torque (Nm) | Rotational Speed (RPM) | Efficiency (%) | Back EMF | Regenerative Braking |
|---|---|---|---|---|---|
| What It Means | Rotational force generated by the motor | Revolutions per minute - how fast the motor shaft spins | How well the motor converts electrical energy to mechanical energy | Voltage generated when motor shaft rotates (useful in sensorless control) | Technique where the load motor returns energy to the system |
Sample Output Metrics You Can Measure
| Parameter | Rotational Speed vs Torque | Power Consumption | Motor Temperature | Voltage & Current | Efficiency Curve |
|---|---|---|---|---|---|
| Why It’s Useful | Shows Mechanical Performance under load | Understands electrical efficiency | Prevents thermal failures and Examine Durability | Tracks power quality | Visualize peak motor performance |
Expandability and Add-ons
You can take your dyno even further with:
- Arduino or Raspberry Pi integration for custom logging
- LabVIEW or MATLAB Simulink for advanced data visualization
- Battery emulators for real-world power source simulation
- Wi-Fi or Bluetooth modules for wireless monitoring
Conclusion
By using SOLO Motor Controller, you gain a high-performance, flexible, and user-friendly motor testing platform. It helps you build, test, and tune motors for robotics, EVs, automation systems, and education—all from your bench or lab.
Additionally, SOLO helps you to receive a motor performance curve in a very short time, which makes the motor evaluation faster and easier.
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