Dynamometer The dynamometer is designed to test the parameters of electric motors. It is designed for both BLDC and DC motors or other types of control that are variable. The device includes a drive matrix for BLDC motors, but it can also be fitted with a different type of driver, for example, servo motor control. The main component is the electronic brake that simulates the engine load. An application that controls its behavior is delivered to the dynamometer. In short, the device works by taking the engine to set the control type, linking the motor to the electronic brake, setting the motor operating voltage, for example 8V, and setting the torque range in [mNm] from 0.1 - 9 mNm. The user can choose his / her own measurement points to have more information at a particular point on the curve, or he can choose default settings. The test runs and we get the required parameters. In addition to automatic mode, the dynamometer also works in manual mode without a PC, this mode is designed for a one-off test of the engine.

Tested motor parameters and curves

  • Torque curve M [mNm]
  • Motor speed N [1/min]
  • Current I [mA]
  • Efficiency F [%]

Dynamometer properties

  • Supply voltage of the dynamometer and brake electronics max 24V / 0.3A
  • External source 12-30V / 5A, internal power converter converts voltage for motor power up to 60V
  • Brake load up to 50mNmv
  • The STOP Emergency Stop button instantly disconnects the power supply in an unexpected state. There is a risk that the user will not realize that he has launched the application and then begins to manipulate the engine interface with the brake.
  • The basic version of the dynamometer is designed for motors up to 20W
  • The dynamometer can be fitted with three power lines of electronic brakes, up to 100W engine power

Front panel

Front panel Used to set parameters in manual mode as well as for one-time testing of motors. In auto mode, the buttons are blocked, except the up-down arrows that select the rows of currently tested parameters, which can be seen in the following figure.

Back panel

Back panel On the rear panel there are fans to remove the heat generated during testing, mainly from the motor brake and power electronics. All connectors are provided for both external power supply and computer communication via USB, electronics supply, earthing clamps and safety STOP button.

It is important that the user can connect their own power supply motors.

Top panel

Top panel In the top window you can see 2 LEDs that indicate correct motor connection, either for DC (No driver) or BLDC motors (Driver), according to selected parameters.

3 terminals for BLDC and 2 for DC motors. The motor is mounted using a special clutch to the electronic brake. The coupler is more than the size of the motor shaft diameter.

SW – computer application

Computer application After the motor is connected to the dynamometer, the driver selects the driver according to the type of the motor tested, currently the DC (no driver) or the BLDC (driver). The range and density of the torque point are selected. The test starts with the play button, everything is done automatically, at the end of the test we can print a standard A4 protocol with the required curves and parameters of the test motor.