改进的M法转速测量

A Novel Approach to Measuring Rotating Speed

针对电机低速时M法转速测量在检测周期内所记录的脉冲数较少导致相对误差较大以致无法保证测量精度的问题,采用一种改进的M法进行测速。分析M法的测速原理,总结出M法不适合高速以外的范围,并且速度越低,其测量精度越低。所采用的基于速度预估的M法测速能在电机高速转动时不失M法的实时性,同时在高速以外的速度范围能够保持与高速相同的测量精度。电机转速测量实验中,改进的M法具有很好的应用,测量精度能够达到M法测量精度的10倍。

A novel approach to the M method is used to solve the problem that the measured precision cannot be guaranteed which is caused by the less recorded numbers of the pulses in a testing time when the motor is at a low speed. After analyzing the theory of the M method, the conclusion that the M method is not suitable except for the high speed is summed up. The lower the speed is, the lower the precision is. The novel approach to the M method is based on estimating the speed, without losing the real-time of the M method at a high speed, which can maintain the same precision in all measuring range. The novel approach to the M method is used as a good application in the motor speed measurement experiment, and the measuring precision of the novel approach to the M method can reach 10 times as that of the M method.