Microstep subdivision driving control method and circuit of fixed-frequency PWM full-bridge motor

Abstract

The invention relates to a microstep subdivision driving control method and circuit of a fixed-frequency PWM full-bridge motor. The microstep subdivision driving control method comprises the steps offirstly, dividing natural step of a stepping motor used by a solar sailboard driving mechanism to microsteps; secondly, allowing a D/A conversion circuit of a control circuit to generate a stepping motor winding current reference sine and cosine signal and a microprocessor to generate a phase sequence signal, and sending the reference sine and cosine signal and the phase sequence signal to a driving circuit so that the two-phase winding of the stepping motor is approximate to step wave currents of a sine function and a cosine function and a low-speed rotation magnetic field is further generated in the motor; and finally, combining the reference sine and cosine signal and sawtooth wave of a fixed frequency, further modulating the current to a PWM control signal, and completing microstep subdivision driving control of the fixed-frequency PWM full-bridge motor.

Description

technical field [0001] The invention relates to a micro-step subdivision driving control method and circuit of a fixed-frequency PWM full-bridge motor. Background technique [0002] Due to the high requirements for attitude accuracy and attitude stability of GEO orbiting earth observation satellites, it is necessary to minimize the interference caused by rotating parts to the satellite, so the solar panel driving device is required to have high rotation accuracy when driving the solar panel to rotate And the speed is steady. [0003] In response to this demand, the solar panel driving device adopts the scheme of indirect drive by stepping motor through gear deceleration plus sine and cosine subdivision. Due to the use of indirect drive, the installation is relatively complicated. At the same time, the level of the input shaft of the reducer and the output shaft of the motor is introduced. The effect of connection conditions on the stability of mechanism drives. When the me...

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Problems solved by technology

But the disadvantage is that the current overshoot is relatively large at low frequencies, and the vibration and noise of the motor are large; there is low-frequency resonance

[0006] The thesis "Design of Two-phase Hybrid Stepping Motor Subdivision Controller" (2015 master thesis of Zhejiang Sci-Tech University, Tang Jiawei) uses a combination of chopper constant current drive and H-bridge drive circuit, and the operation stability is relatively poor. Moreover, its power drive circuit directly adopts the integrated chip L6506 and its peripheral circuits, which can only drive small power motors.

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