Motor rotor position measuring method with compensation capability and device employing same

Abstract

The invention relates to a motor rotor position measuring method with a compensation capability and a device employing the same. The motor rotor position measuring method is technically characterized in that three Hall sensors are added at a certain angle on a code disc combined by a traditional code disc and three sensors; and motor position signals are sampled, the ascending edges of original output signals serve as the ascending edges of finial output signals, the ascending edges of the added Hall sensors are changed into the descending edges of the final output signals, and the ascending edges not changing together with the rotational speed variation are adopted to measure the motor rotor position. Therefore, the position measuring compensation is realized and the measuring precision is not affected by the rotational speed variation.

Description

technical field [0001] The invention relates to a motor rotor position measurement method with compensation capability and a device thereof, which belong to motor and electric control technology, and relate to motor position detection technology. Background technique [0002] With the expansion of the application field of high-speed motors, the means of detecting the rotor position of the motor with high precision must also be improved to meet the needs of the application. For motors such as switched reluctance motors and permanent magnet synchronous motors, the rotor position signal is the most important control basis, and all require high-precision motor rotor positions. Therefore, the accuracy and response speed of the detection device signal are very high, and Currently limited by the technology of position sensor devices, the response time is slow and asymmetrical, which is the most important factor affecting the measurement accuracy. [0003] The position sensors curr...

AI Technical Summary

Problems solved by technology

However, when the Hall position sensor is measured at a high speed, due to the influence of the response time and the hysteresis effect, the delay of the rising and falling edges at different speeds is inconsistent, resulting in an asymmetrical output signal, and the duty cycle is often less than 45% or greater than 55%. The use of quadrature encoding circuit is easy to cause large errors. Although proper compensation can be made by adjusting the motor code disc, it is only suitable for fixed-speed motors. For variable-speed motors, multiple measurement compensations are required, which is time-consuming and laborious, and the effect is not good.

In addition, in order to ensure the measurement accuracy, the requirements for the accuracy of the processed code disc teeth are very high, which is difficult for general equipment to meet.

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