Rare earth permanent magnet brushless motor
The additional power of the motor is 55W, the additional voltage is 24V, the working condition is short-time operation, the additional speed is 1800rpm, the planning mode is square wave planning, and the motor is twelve slots and two pairs of poles. The trough shape is a trapezoidal slotted fan slot. The winding mode is a three-phase star-six condition, and the slot fullness is 52%. The rotor magnet is bonded with NdFeB and is radially magnetized. The detailed parameters of the magnetic steel are as follows: Br>6000Gs, Hc>5000Oe, [BH]max>8MG•Oe, Hjc>10000Oe. In the finite element analysis, the motor practice electromagnetic torque is 0.2394 N•m.
Controller
The main control unit of the controller selects TI's DSP chip TMS320LF2407A. The main control unit needs to detect the current signal and rotor orientation signal of the motor, and supply six PWM drive signals to the drive board. Therefore, control a brushless DC motor, requiring 6 PWM output, one ADC conversion, three capture units.
About the TMS320LF2407A processor, because it has two things manager (EVA and EVB), each thing manager has 3 capture units and can output 6 PWMs, so the chip can directly work together for two brushless DC motors. Supply control signals. Because the control chip peripheral circuit is more sophisticated, but it has a large program memory, therefore, related to the hardware, to complete the flexible control of the motor, focusing on the software side.
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