Method for detecting initial position of permanent magnet synchronous motor
A technology for permanent magnet synchronous motors and detection methods, which is applied in the direction of control of generators, motor control, motor generator control, etc., can solve the problem that it is difficult to distinguish the N/S poles of the rotor, so as to ensure accuracy, improve reliability, The effect of simple process
Active Publication Date: 2016-02-24
SOUTHEAST UNIV
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Problems solved by technology
However, the initial position extracted by this method is symmetrical, and it is difficult to distinguish the N / S poles of the rotor, and the rotor is also susceptible to slight rotation due to the injection pulse.
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[0031] Embodiments of the present invention will be specifically described below with reference to the accompanying drawings.
[0032] A method for detecting the initial position of a permanent magnet synchronous motor according to an embodiment of the present invention includes the following steps:
[0033] Step 1: A set of assumed rotor position sequence θ is sequentially given to the permanent magnet synchronous motor in the controller ass (n), θ ass (n)=2nπ / N, n=0, 1, 2,..., N-1; N is an integer greater than 1; each assumed rotor position corresponds to an assumed rotor coordinate system; in each assumed rotor coordinate system Next, the d-axis voltage reference value U d_ass Given as a normal constant, the q-axis voltage reference value U q_ass Given as 0. Each assumed rotor coordinate system consists of a d-axis and a q-axis. Although in theory, the larger N is, the higher the detection accuracy is. However, the larger N is, the longer the detection time is. Consi...
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The invention discloses a method for detecting the initial position of the permanent magnet synchronous motor, and the method comprises the following steps: 1, sequentially giving a supposed rotor position sequence to the permanent magnet synchronous motor; 2, extracting the n-th supposed rotor position, and calculating a three-phase duty ratio; 3, generating a switching signal through the comparison of the three-phase duty ratio with a triangular wave; 4, measuring a three-phase current of the motor through a current sensor; 5, calculating and obtaining a d-axis current in a supposed rotor coordinate system at step 2; 6, returning to step 2, calculating the d-axis current in the supposed rotor coordinate system till the d-axis currents in the supposed rotor position sequence are measured completely, and forming a d-axis current sequence; 7, enabling the supposed rotor position corresponding to the maximum value in the supposed rotor position sequence to serve as the actual initial position of a rotor. The method can guarantee the detection accuracy of the initial position.
Description
technical field [0001] The invention belongs to the technical field of motor drive and control, and in particular relates to a method for detecting the initial position of a permanent magnet synchronous motor. Background technique [0002] Due to the advantages of high efficiency, high torque density, and high power density, permanent magnet synchronous motors (PMSM) have attracted much attention in recent years. In the permanent magnet synchronous motor drive system, the rotor position is particularly critical, and is generally obtained by a mechanical position sensor. For example, resolvers and optical encoders. However, the use of position sensors increases the size and cost of the PMSM drive system. In addition, the presence of position sensors also reduces system reliability. Therefore, position sensorless control has become a hot topic in recent years, and many positionless control methods have been proposed. [0003] In order to realize positionless control, the i...
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Login to View More IPC IPC(8): H02P21/32H02P21/18
CPCH02P2203/03H02P2207/055
Inventor 王伟张景皓程明
Owner SOUTHEAST UNIV