Speed detection method and circuit for non-inductive brushless motor
A technology for speed detection and brushless motors, which is applied in motor control, electronic commutation motor control, electrical components, etc. It can solve the problems of non-smoothing effect of speed detection, narrow motor speed detection range, and poor anti-software interference ability. Achieve the effects of increasing the rotor speed detection range, improving anti-interference ability, and improving accuracy
Inactive Publication Date: 2019-12-31
NO 43 INST OF CHINA ELECTRONICS TECH GRP CETC
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Problems solved by technology
[0006] The shortcomings of the above-mentioned motor speed detection method are: (1) it cannot eliminate the influence of the frequency interval asymmetry of the back electromotive force zero-crossing signal pulse caused by the asymmetry of the stator coil; (2) the algorithm has poor anti-software interference ability, and the speed The detection does not have a smoothing effect; (3) The motor speed detection range is narrow
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[0032] like figure 1 As shown, a motor speed detection circuit based on counter electromotive force zero crossing, including a neutral point voltage calculation circuit 1, a neutral point voltage comparison circuit 2, and a zero crossing processing circuit 3.
[0033] Among them, the neutral point voltage obtaining circuit 1 uses the terminal voltage information of the three phases of the motor stator to obtain the three-phase neutral point voltage of the motor, which provides support for the subsequent voltage signal comparison circuit. Due to the complex composition of the terminal voltage signal, it is easily affected by phenomena such as armature reaction, PWM chopping, freewheeling, and line parasitic parameters, resulting in the amplitude of the terminal voltage signal greatly exceeding the power supply voltage range, which may damage the subsequent chip in severe cases. , therefore, the terminal voltage signal needs to be processed by a clamp circuit to provide a reliab...
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The invention relates to a speed detection method and circuit for a non-inductive brushless motor. The detection method includes the following steps: (1) capturing a motor three-phase terminal voltagepulse signal; (2) obtaining a back-EMF zero-crossing point pulse signal according to the voltage pulse signal; (3) calculating a time interval between the voltage pulse signal and the zero-crossing pulse signal, setting a rotor cycle, and storing the value of a counter in a preset register; and (4) according to the current value of the register and in combination with the value of a current channel previous stage storage register, calculating the total value of the register in the entire rotor cycle, and obtaining the current speed of the motor according to the value of the register. The method improves the speed detection accuracy and expands a detection range, and without reducing the real-time condition of the speed detection, fully improves the accuracy of the speed calculation, fullycancels out the influence caused by the asymmetry of a stator winding and the rotor, and improves the anti-interference ability of speed software speed detection.
Description
technical field [0001] The invention relates to the technical field of brushless DC motor control, in particular to a speed detection method and a detection circuit of a non-inductive brushless motor. Background technique [0002] The speed calculation is the core unit in the speed loop control of the positionless motor. It mainly uses the three-phase terminal voltage signal of the motor to obtain the zero-crossing pulse signal of the back electromotive force. After proper algorithm processing, the real-time calculation of the motor speed is realized. This method can be used It is widely used in position sensorless servo motor control system. [0003] Due to military fields such as aerospace, ships, weapons, electronics, and industrial applications such as electric vehicles, robots, and drones, motors need to work in very harsh environments, such as high temperature, high pressure, low temperature, strong vibration, etc. (The function of the sensor has been Failure), or som...
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IPC IPC(8): H02P6/182
CPCH02P6/182H02P2207/05
Inventor 王朝庆尚玉凤杨扬周晶庄永河袁宝山
Owner NO 43 INST OF CHINA ELECTRONICS TECH GRP CETC