Driving of rare earth permanent magnet brushless motor
The drive link circuit of the motor control system adopts a full bridge structure, and the motor voltage and current waveforms are modulated by controlling the opening and closing of six power components. PWM modulation of the motor voltage is accomplished by utilizing four separate 16-bit general purpose timers and six full comparators included in the TMS320LF2407A. The TMS320LF2407A includes programmable dead-time control. Any of the six full comparators is used with the general-purpose timer and dead-band control unit to isolate a pair of PWM outputs with programmable deadband and output polarity. There are twelve such PWM outputs. Each of the six outputs can be used to control the brushless DC motor and complete the DSP control of the two motors.
IRF540 power tube is selected. The maximum operating voltage of the equipment is 100V, the maximum operating current is 28A, and the maximum power loss is 150W, which fully meets the power requirements of the system. The freewheeling diodes D1～D6 use fast recovery diodes; the capacitors C1～C3 are used to absorb DC busbars. The spike voltage on the upper pole prevents the excessive bus voltage from breaking through the power tube; the resistor R2 is used to detect the current on the DC bus of the motor to avoid the overcurrent fault of the motor. The overcurrent signal Isence is processed and input to the front stage of the power bridge. In the driver chip and the DSP processor, the gate drive signal can be blocked in time when overcurrent.
The front drive of the power tube uses IR motor drive chip IR2130. The chip integrates functions such as drive, dead zone and overcurrent maintenance. It can be used to drive six power tubes with a single power supply. It is very convenient to use. Suitable for small power drive applications.
The motor running status is indicated by the global variables RUN_STATE_A and RUN_STATE_B. 088H indicates that the motor is running, 00H indicates that the motor is running, and 0FFH indicates that the motor is stopped.
The combination of rare earth permanent magnet brushless DC motor and DSP control technology is an important development direction of brushless motor.
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