Brushless DC motor commutation circuit based on position sensorless

Abstract

The invention discloses a brushless DC motor commutation circuit based on position sensorless. The brushless DC motor commutation circuit comprises a power main circuit (5) and a digital signal processor (DSP) controller (6) and also comprises a counter potential detection and filter circuit (1), an isolation amplification circuit (2), a zero-point capture circuit (3) and a position detection circuit (4). A special position sensor is not needed to be arranged at a brushless DC motor end, a complicated detection circuit is prevented, the motor cost is reduced, the motor installation volume is reduced, and the commutation accuracy and the reliability are improved.

Description

technical field [0001] The invention relates to a phase commutation circuit of a brushless direct current motor, in particular to a phase commutation circuit of a brushless direct current motor based on a position sensor. Background technique [0002] Brushless DC motors have the advantages of small rotor inertia, high power density, high efficiency, small size, and brushless, and have superior performance compared to DC motors. They are widely used in high-performance motion control fields such as robots and CNC machine tools. With the rapid development of control theory and power electronic devices, brushless DC motors are more and more widely used, and the control performance of brushless DC motors depends critically on the accuracy and reliability of the motor commutation circuit. [0003] The existing brushless DC motor commutation circuit is mainly divided into two parts: the commutation circuit based on the position sensor and the commutation circuit based on the non-...

AI Technical Summary

Problems solved by technology

The advantage of these two circuits is that the detection accuracy is relatively high, and the disadvantage is that the cost and volume of the motor are increased, and there are many lead wires, which reduce the anti-interference and reliability of the system.

The commutation circuit based on the position sensor does not realize the commutation of the motor by collecting parameters such as voltage, current, and speed, and combining the mathematical model and related parameters of the motor to realize the commutation of the motor. The advantage is that the mechanical position sensor can be omitted. , to reduce the size and cost of the motor, the disadvantage is that the algorithm is complex, the real-time performance is poor, and the implementation is difficult, and due to the uncertainty of the motor parameters and mathematical models, the calculation accuracy of the commutation point of the motor is reduced

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