Auto detection method for increment photoelectric code disk mounting position on permanent magnet synchronous motor
A permanent magnet synchronous and photoelectric code disc technology, applied in the control of electromechanical transmission, motor generator control, electronic commutation motor control, etc., can solve the problems of low positioning accuracy, inability to match permanent magnet synchronous motors, troublesome operation, etc.
Inactive Publication Date: 2005-03-30
南京埃斯顿工业自动化有限公司
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[0003] The present invention aims to solve the problem that the existing permanent magnet synchronous motor is troublesome to operate and the positioning accuracy is not high when adjusting the installation position of the incremental photoelectric code disc. At the same time, it also solves the problem that the servo driver cannot match the permanent magnet synchronous motors of different motor manufacturers. The problem
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[0009] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0010] exist figure 1 In the method of asynchronous dragging, a three-phase sine wave current with a frequency lower than 5 Hz is passed into the stator U, V, and W three-phase windings of the permanent magnet synchronous motor (3) by the servo driver (1), so that the permanent magnet The synchronous motor (3) rotates in one direction. Use a binary reversible counter (2) to count the rising and falling edges of the A and B quadrature pulse signals of the incremental photoelectric code disc (4), and use the C pulse signal of the incremental photoelectric code disc as a binary reversible counter (2) Clear signal. When the servo driver (1) detects the C pulse signal of the incremental photoelectric encoder (4), it continues to rotate the permanent magnet synchronous motor (3) until the current of the U-phase winding of the stator reaches a 90° phase, mai...
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In the method, servo drive inputs a low frequency harmonic AC in three phases to windings of stator in three phases of permanent magnet synchronous motor, making motor rotate in one direction. Counting is carried out for A, B orthogonal pulse signals of increment type opto-electronic coded disc by using binary reversible counter. C pulse signal of coded disc is as reset signal of reversible counter. When servo drive has detected C pulse signal of coded disc, rotation of motor is continued till current of winding in U phase of stator reaches phase in 90 degrees. Keeping current in three phase unchanged makes rotor of motor fix at axial line of winding in U phase of stator. At this point, count value of the reversible counter denotes position of rotor of motor related to C pulse signal of coded disc. Since servo drive is able to detect installation position of coded disc, thus, increment type opto-electronic coded disc can be installed at any position.
Description
technical field [0001] The invention relates to an automatic detection method for the installation position of an incremental photoelectric code disc installed on a permanent magnet synchronous motor. Background technique [0002] At present, the incremental photoelectric encoder has high detection accuracy, low price, relatively smooth output signal, and the amplitude is not affected by the motor speed, so it has been widely used in high-performance permanent magnet synchronous motor vector control systems. However, the current servo driver cannot automatically detect the installation position of the incremental photoelectric code disc installed on the permanent magnet synchronous motor. It can only be adjusted to install the code disc at a specific position, that is, the code disc installation cannot be arbitrary. Otherwise, the motor cannot run normally. The operation of adjusting the installation position of the code disc is also very troublesome. First, use another mot...
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IPC IPC(8): H02P21/18
Inventor 王帆王晓伟
Owner 南京埃斯顿工业自动化有限公司