Principle and composition of permanent magnet brushless DC motor drive system
The electric dental seat has two degrees of freedom, pitch and lift. The servo system uses two rare earth permanent magnet brushless DC motors as the main components of motion control, and is driven separately for two degrees of freedom. As shown in Fig. 1, the motor A is a pitch motor, and the motor B is a lift motor.
Motor
The rated power of the motor is 55W, the rated voltage is 24V, the working state is short-time operation, the rated speed is 1800rpm, the design mode is designed according to square wave, and the motor is twelve slots and two pairs of poles. The trough shape is a trapezoidal slotted fan slot, the winding form is a three-phase star six state, the slot full rate is 52%, the rotor magnet is bonded with neodymium iron boron, and the radial magnetization is performed.
Controller
The main control unit of the controller adopts TI's DSP chip TMS320LF2407A. The main control unit needs to detect the current signal and rotor position signal of the motor and provide six PWM drive signals for the drive board. Therefore, to control a brushless DC motor, 6 PWM output, one ADC conversion, three capture units.
drive
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.
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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