Abstract:

According to the requirements for the measurement of the torque and rotation speed of power machinery,a motor torque speed tester is designed using the motor torque and speed sensor to achieve a high-precision measurements of the motor torque and speed.As for the hardware,microcontroller (R8C/25) is used as the data processing core,the linear DC power supply is designed using isolation transformer to reduce the electromagnetic interference caused by traditional switching power supply,and the sensor output signal is isolated by high-speed optocoupler to improve the anti-jamming capability.As for the software,timing pulse count is adopted taking advantage of the microcontroller event counting function and the external interrupt function synchronous torque and speed pulse signal to calculate the torque value and speed values,and then calculate the shaft output power.Measured values are displayed real time on the digital tube.The sensor calibration results verify the correctness of the system design.

Key words: Torque and speed sensor;torque speed tester;microcontroller