Device and method for measuring rotational speed ripple and torque ripple of motor
A technology of motor speed and torque ripple, applied in measurement devices, torque measurement, linear/angular velocity measurement, etc., can solve the problems of motor torque fluctuation, affecting application, affecting the output performance of motor drive system, etc. Effect
Inactive Publication Date: 2017-02-15
TIANJIN POLYTECHNIC UNIV
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Problems solved by technology
Torque ripple will cause torque fluctuation and speed fluctuation of the motor, which in turn will generate vibration and noise
If the torque ripple of the motor system is too large, it will greatly affect its application in high-performance occasions such as servo drive
[0003] The torque ripple of the motor directly affects the output performance of the motor drive system, which limits its wide application in various fields
Method used
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[0018] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.
[0019] Such as figure 1 As shown, the tested motors, encoders, integrated chips and circuit components used in the present invention can be obtained from the market. For example, the motor under test can be a switched reluctance motor, the encoder can be an absolute encoder, and the frequency-voltage conversion chip can be a chip such as LM2907.
[0020] Due to the existence of torque pulsation when the motor is running, the output analog voltage signal of the encoder output pulse signal reflecting the motor operating condition contains the average voltage value and the voltage pulsation value after passing through the frequency-voltage conversion circuit. Among them, the average voltage is determined by the input frequency of the frequency-to-voltage conversion circuit and the circuit design parameters, and satisfies u 0 =Kf; In a torque ...
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The invention relates to a device and a method for measuring the rotational speed ripple and torque ripple of a motor. The device comprises a to-be-measured motor, an encoder, a rectifier circuit, a frequency voltage conversion circuit, a filter circuit, a data collection module and a host platform. Through measurement of motor rotational speed ripple, the torque ripple is measured indirectly. When a motor rotates, the encoder connected with the motor coaxially transmits a pulse signal; the frequency of the pulse signal can reflect the instantaneous rotational speed of the to-be-measured motor; and the pulse signal is converted to an analog voltage through a frequency-voltage conversion circuit. The rotational speed ripple is measured by measuring the change amount of the analog voltage. By means of the relation between the torque ripple and the rotational speed ripple, the analog voltage reflecting the rotational speed ripple is converted into the torque ripple through calculation, thereby achieving indirect measurement of the torque ripple. The device and the method can measure the rotational speed ripple and the torque ripple of the motor in real time and provide reliable basis for research on motor torque ripple reduction.
Description
technical field [0001] The invention relates to the technical field of motors, in particular to a measuring device and method for motor speed pulsation and torque pulsation. Background technique [0002] When the motor runs stably at a certain speed, the instantaneous output torque fluctuates up and down with time, which makes the output torque of the motor fluctuate around a certain average value, thereby generating torque ripple. The generation of torque ripple is determined by factors such as motor structure, control strategy and various disturbances in the operation process. Torque ripple will cause torque fluctuations and speed fluctuations of the motor, which in turn will generate vibration and noise. If the torque ripple of the motor system is too large, it will greatly affect its application in high-performance occasions such as servo drives. [0003] The torque ripple of the motor directly affects the output performance of the motor drive system, which limits its ...
Claims
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IPC IPC(8): G01P3/481G01L3/00
CPCG01L3/00G01P3/481
Inventor 蔡燕徐海南杨庆新姜文涛
Owner TIANJIN POLYTECHNIC UNIV