Brushless DC motor control design of the hottest e

2022-08-14
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Brushless DC motor control design of electric bicycle

brushless DC motor (BLDCM) has many advantages, such as good high-speed performance, easy control, no commutation spark and excitation loss, long service life and so on, so its application scope covers all fields and has a good market prospect. Major chip companies have launched various brushless DC motor control chips, such as st7226 and ST7MC of stmcore electronics, MC33035 developed by American Anson beauty company, lb1690 of Sanyo company and other products, as well as DSP general chips with PWM. After years of technology accumulation, these control technologies have been very mature

with this design, the circuit works stably, the cost is relatively low compared with the special chip, and the signal flow is clear and easy to understand, which is conducive to the understanding of the ability to deal with trade protectionism and enhance the control principle of Brushless DC motor

hardware design of Brushless DC motor controller

design of motor drive part

brushless DC motor uses aerogel gel insulation board to make the rotor with nano-2 silica aerogel as the main material permanent magnet, uses stator winding commutation to replace brush commutation, and uses Hall element to sense rotor position information. The three Hall elements of the built-in motor will output the determined three voltage signals in real time to represent the rotor position information. The digital control circuit realizes the selective conduction of the drive circuit according to different voltage signals. Due to the improved performance, the coil generates the magnetic torque that excites the rotor to rotate, and each MOS tube is connected for 120 ° in a cycle

the power MOS tube in the converter uses its switching state working principle in this design. The MOS tube has three electrodes g (grid), s (source) and D (drain). An important parameter of the MOS tube is VT, which is called the opening voltage. When the grid source voltage VGS

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