Outer rotor type permanent magnet motor with rotor position sensor, method for detecting rotor position and servo motor system

Abstract

The invention discloses an outer rotor type permanent magnet motor with a rotor position sensor, a method for detecting a rotor position and a servo motor system. The motor comprises 4N sensor windings for position detection, N is an integer larger than zero, the sensor windings are wound on at least 4N salient poles in a stator respectively, the 4N sensor windings are divided into two sets, each set of sensor windings comprises an upper-section winding and a lower-section winding, the upper-section windings are connected in series, the lower-section windings are connected in series, the fundamental wave phase position of combination inductance generated after the upper-section windings of the two sets are connected in series and the fundamental wave phase position of combination inductance generated after the lower-section windings are connected in series differ by 180 degrees and are connected in series, the fundamental wave phase positions of the upper-section windings of the two set of windings differ by 90 degrees, the sensor windings are connected in parallel, and the parallel connecting point of the sensor windings is an excitation signal input end. The series connecting points of the upper-section windings and the lower-section windings of the two sets of windings are the output ends of position signals. A servo motor can achieve corner detection under a high-temperature and high-vibration environment.

Description

technical field [0001] The invention relates to a rotor position angle detection technology of a servo motor, in particular to a rotor position detection technology of an outer rotor type permanent magnet motor. Background technique [0002] At present, the detection of the rotor position angle of the servo motor is mainly carried out by means of an optical encoder or a resolver. These two methods have defects and deficiencies in practical applications: [0003] 1. Optical encoder method: This method requires an optical encoder to be installed on the rear shaft of the motor in order to detect the rotor angle. However, since optical encoders are composed of optical devices and semiconductor devices, the lifetime of the semiconductor devices is shortened when used in a high-temperature environment, and the reliability is poor. At the same time, when used in a strong vibration environment, the optical device is easily damaged, resulting in the failure of the detection function...

AI Technical Summary

Problems solved by technology

However, the resolver has 6 leads, which increases the wiring and needs to be installed at the rear of the motor, making it difficult to reduce the thickness of the motor

Images