Method and system for zero position measurement of permanent magnet synchronous motor
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A technology of permanent magnet synchronous motor and zero position, which is applied in the direction of electronic commutator, etc., can solve problems such as non-correspondence, angle θ deviation, and inability to obtain accurate results, etc., to achieve improved accuracy, significant improvement, and significant current waveform Effect
Active Publication Date: 2016-11-23
BYD CO LTD
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[0008] It can be seen from the above coordinate transformation relationship that if there is a deviation in the zero position value of the motor, there will be a deviation in the value of the angle θ, which will lead to the non-correspondence of the variable control position sequence in real-time high-precision control and the inability to obtain accurate results.
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[0046] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.
[0047] In the description of the present invention, it should be understood that the terms "first" and "second" are used for description purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of said features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.
[0048] In the descr...
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Abstract
The invention discloses a method for zero position measurement of a permanent magnet synchronous motor. The method includes a static testing step and a dynamic calibration step. According to the static testing step, S11, q-axis currents are provided, and d-axis currents are set to be zero; S12, whether a sampling value of a position sensor fluctuates near a fixed value or not is judged, and if yes, the step S13 is executed; S13, the sampling value of the position sensor is used as a middle zero position. According to the dynamic calibration step, S31, the motor is dragged to rotate at set rotating speed; S32, the d-axis currents are increased, and the q-axis currents are set to be zero; S33, whether the torque of the motor is kept near zero all the time or not is judged, if yes, the step S34 is executed, and if not, the step S35 is executed; S34, the middle zero position serves as a final zero position of the motor; S35, the middle zero position is corrected, and the torque of the motor is maintained near zero. According to the method, the middle zero position is obtained after the static testing step, the middle zero position is calibrated again in the dynamic calibration step, and therefore the obtained zero position of the motor is more accurate. The invention further discloses a system for zero position measurement of the permanent magnet synchronous motor.
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