Operation principle of the hottest brushless DC mo

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Operation principle of Brushless DC motor

based on the detailed introduction of the traditional "back EMF method" position sensorless control technology, an improved "back EMF method" is proposed. This method detects the rotor position accurately and has a wide adjustable speed range. Finally, an experimental platform is built and the experimental results verify the correctness and feasibility of this method

during the operation of Brushless DC motor, it is necessary to use the position sensor to detect the rotor magnetic field position signal, and use its output signal to conduct the power devices and drive the normal operation of the motor according to a certain logical sequence through the electronic commutation circuit with the release of many raised and invested production capacity in the coming year. Traditional position sensors such as Hall components and resolvers need to be assembled inside the motor to detect the rotor position signal. Due to the special motor structure design, its installation and maintenance are extremely inconvenient. Therefore, the research of Brushless DC motor sensorless technology is increasingly attracting people's attention, and the back EMF method is a relatively mature method among many sensorless control technologies. The improved back EMF method proposed in this paper requires simple hardware, accurate and stable control. Through further research, a series of new graphene functional materials with better performance will be obtained. The actual experiments show that this method is correct Valid

when there are too many oxide scales, this paper takes the three-phase six state brushless DC Panasonic exchange servo motor with star connection and two two conduction as the research object. Figure 1 shows the control principle block diagram of Brushless DC motor. The inverter works in PWM modulation mode, and the controller takes greeneale 56f8013 as the core

for three-phase six state 120. Conduction mode: the conduction sequence of each power tube is sos3, SOS5, $2s5, $2s1, $4s1, $4s3. When the power tube sos3 is turned on, the current flows in from phase a through S0 tube, flows out from phase B, and returns to the negative bus of the power supply through S3 tube. At this time, a rotating magnetic field is generated in the motor stator winding, causing the rotor to rotate. In this way, under the cyclic conduction of the above six states, the rotor rotates continuously. Changing the conduction sequence of each power tube can change the rotation direction of the motor

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