Dynamometer Selection

Based on load mechanism, they can be categorized as:

• Magnetic Powder Dynamometer – Suitable for medium/low-speed, high-torque testing; fast response and stable control.
• Hysteresis Brake Dynamometer – Suitable for high-speed, low-torque testing; fast response and stable control.
• Servo Motor Dynamometer – Capable of four-quadrant operation (motoring/braking), high-precision control, ideal for high-speed dynamic load testing and regenerative energy systems.
• Prony Winding Brake – Suitable for motors under 20 W with high rotational speed; no coupling required, significantly improving measurement accuracy for very small motors.

Key considerations include:

1. Motor power and torque range (determines dyno capacity).
2. Maximum test speed (must match motor’s design speed).
3. Test purpose (R&D, durability, production line, performance curve).
4. Required control modes (constant speed, torque, power, 4-quadrant simulation).
5. Data acquisition accuracy and software interface.
6. Cooling system (water-cooling or air-cooling), depending on continuous duty needs.
7. Space and installation conditions (horizontal/vertical axis, fixture size).

4-Quadrant (4Q) dynamometer can operate in four states: forward/reverse rotation and motoring/braking.
It can simulate real-world operating conditions such as acceleration, deceleration, and regenerative load. Common applications include:

• EV motor performance & regeneration tests
• ECU response verification
• Energy recovery system tests

These systems are typically based on servo motors or DC motors, paired with high-precision torque sensors and advanced control software.

Common test results include:

• Torque (N·m)
• Speed (RPM)
• Power (W / kW / HP)
• Efficiency (%)
• Input voltage/current (V / A)
• Motor temperature rise, noise, vibration
• Load curve, startup curve, BEMF curve
• Durability and stability performance
• Regenerative energy efficiency (if applicable)

Torque is the core parameter for calculating power and efficiency.
If measurement error exceeds ±0.2%, performance curves may be misinterpreted. High-precision torque sensors provide:

• More stable closed-loop control
• Accurate power calculations
• Reduced data drift and cumulative error

This is especially important for R&D and calibration testing.

Yes.
Using the control system, one can set acceleration/deceleration profiles, slope simulation, variable-frequency loads, and resistance simulation.
With dedicated software, users can create custom test scripts (profiles) to apply different torque or speed values in stages to replicate real operating environments.

Modern dynamometers support multiple communication interfaces (CAN, EtherCAT, RS485, MODBUS). They can integrate with:

• Motor controllers (MCU / Inverter)
• Power supplies and load banks
• Temperature, flow, and pressure sensors
• DAQ systems, LabVIEW, PLC
• Durability testers and environmental chambers

1. Set the target speed or torque condition.
2. Measure input electrical power (Pin = V × I × PF).
3. Measure output mechanical power (Pout = Torque × RPM × k).
4. Efficiency = Pout / Pin × 100%.

The dynamometer can generate real-time efficiency maps for motor optimization.

A properly used dynamometer can last over 10 years.
Recommendations:

• Check cooling system, pump, and bearing lubrication every 6 months.
• Calibrate the torque sensor annually.
• Release load and keep the system dry before long-term storage.
• For regenerative systems, regularly inspect insulation and overload protection of the energy recovery unit.

• Integrated test platform for motors, rotors, and controllers.
• Supports servo-type four-quadrant regenerative systems.
• Equipped with high-precision torque sensors and multi-protocol communication.
• Self-developed control software with automated test scripting.
• Custom fixtures and safety protection designs available.
• Applicable to EV motors, BLDC motors, ACIM, and other applications.