Small armature inductance high-speed permanent-magnet brushless DC motor control system without position sensor

Abstract

Small armature induction high-speed permanent magnetism brushless D.C. motor non - position transducer control system is composed of amplitude limiting multiplepath switching unit, program control amplifier comparator, electric isolation circuit, current transducer, filter circuit, small armature induction permanent magnetism brushless D.C. motor, triphase inversion bridge and digital controller etc part. When PWM has larger duty ratio, comparing no conduction phase terminal voltage with supply voltage reference value, outputting phase conversion signal, when PWM has less duty ratio, comparing no conduction phase terminal voltage with armature winding midpoint voltage, outputting phase conversion signal, when armature winding and inversion bridge is disconnected due to fault, said digital controller still capable of obtaining motor rotor positional information. The present invention effectively solves phase conversion controlled problem, raising driving parts reliability and precision.

Description

technical field [0001] The invention relates to a position sensorless control technology of a small armature inductance high-speed permanent-magnet brushless DC motor, which can be used as a highly reliable and high-precision control method for the driving parts of the attitude control actuators of spacecraft such as satellites and space stations. Background technique [0002] The driving components of the attitude control actuators of spacecraft such as satellites and space stations require high reliability and high precision to ensure the stable and efficient operation of the spacecraft. At present, the driving components used in attitude control actuators generally adopt permanent magnet brushless DC motors with position sensors. The control system of the permanent magnet brushless DC motor obtains the position signal of the rotor through the position sensor, and performs commutation and speed regulation according to the position signal. However, since there are many wir...

AI Technical Summary

Problems solved by technology

[0007] The technical problem solved by the present invention is to overcome that when the existing position sensorless control technology is applied to a small armature inductance high-speed permanent magnet brushless DC motor, it is impossible to obtain accurate rotor position information at an excessively high speed, so as to perform effective commutation Control shortcomings; and overcome the shortcoming that the commutation signal cannot continue to be detected after the armature winding and the three-phase inverter bridge fail to disconnect, and provide a position sensorless high-speed permanent magnet brushless DC motor with small armature inductance Control system, the system has the advantages of high reliability and high precision

Images