Motor driver, motor and application

Abstract

The invention discloses a motor driver, a motor and application, which are characterized in that the motor driver is provided with: a back electromotive force zero-crossing point output circuit for filtering a fast follow current signal or a back electromotive force zero-crossing point output circuit with an electronic switch or a fast follow current output circuit; and a phase line high level taking circuit, wherein the electronic switch is provided with a control end, the control end is electrically connected with the fast follow current output circuit or the phase line high level taking circuit or the single-chip microcomputer. The two zero crossing point output circuits are provided with Schmidt trigger circuits, the electronic switch is located between the signal of a phase line and the zero-crossing point output circuits, the two zero-crossing point output circuits are electrically connected with the single-chip microcomputer, and the fast follow current output circuit comprisesan output circuit with the phase line level higher than a power supply level or an output circuit with the phase line level lower than a power supply ground wire level. The motor driver particularly relates to the advantages of non-inductive closed-loop high-speed driving of a stepping motor, large output torque, low temperature rise, no resonance of the motor and the like.

Description

technical field [0001] The present invention relates to the field of motor drivers, to the field of sensorless drives such as brushless motors, permanent magnet motors, stepping motors, and low-speed synchronous motors, and to technical inventions in the fields of automation equipment driven by motors, electric appliances, vehicles, etc. . Background technique [0002] In the existing sensorless three-phase brushless motor driver, electronic commutation is usually adopted. The commutation signal comes from the integration of three-phase voltages after delay, and the integrated voltages of the three phases are connected together through resistors to form a common point. , the voltage after the integration of each phase and the common point output the commutation signal through the comparator. Since the phase voltage is the voltage in PWM mode, the voltage is alternately formed by high level and low level. After integration, it is integrated when it is high level The level of...

AI Technical Summary

Problems solved by technology

[0003] In the field of existing stepper motor drives, due to the time delay, the precise commutation of stepper motors is still unprecedented. They all use time commutation and drive with a fixed current to increase the temperature of the motor and generate The motor vibrates at low frequency, the torque is small at high speed, and the electrical efficiency is low.

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