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. The specific parameters of the magnetic steel are as follows: Br>6000Gs, Hc>5000Oe, [BH]max>8MG•Oe, Hjc>10000Oe.
In the finite element analysis, the actual electromagnetic torque of the motor is 0.2394 N•m. The distribution of parameters such as motor flux and magnetic induction is shown in Figure 3 and Figure 4. It can be seen from Fig. 4 that the magnetic induction intensity distribution of the air gap of the motor is basically a square wave distribution, and the average value is basically consistent with the design result of the electromagnetic scheme.
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 front drive of the power tube adopts IR motor drive chip IR2130. The chip integrates functions such as drive, dead zone and overcurrent protection. It can complete the driving of six power tubes with a single power supply. It is very convenient to use. Suitable for small power drive applications.
The combination of rare earth permanent magnet brushless DC motor and DSP control technology is an important development direction of brushless motor.
If you want to buy a medical device motor, please pay attention to Motors For Medical Applications.
