Permanent magnet synchronous motor, control method and control device for permanent magnet synchronous motor
A technology of permanent magnet synchronous motor and control method, which is applied in the direction of motor generator control, electromechanical transmission control, electronic commutation motor control, etc., and can solve problems such as inability to provide energy for the motor and unstable operation of the controller
Active Publication Date: 2017-11-10
GD MIDEA AIR-CONDITIONING EQUIP CO LTD +1
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Problems solved by technology
But in the non-electrolytic capacitor driver, because the DC bus voltage fluctuates with the grid voltage, and at the trough of the DC bus voltage, the motor cannot be supplied with energy due to the low DC bus voltage, especially when the DC bus voltage is lower than the motor’s When the equivalent counter electromotive force is used, the motor will be in the state of power generation, so that the DC bus voltage and input current will generate harmonics, making the controller work in an unstable state
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[0033] 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 designate 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 and are intended to explain the present invention and should not be construed as limiting the present invention.
[0034] The following describes the control method of the permanent magnet synchronous motor, the control device of the permanent magnet synchronous motor and the permanent magnet synchronous motor according to the embodiments of the present invention with reference to the accompanying drawings.
[0035] figure 1 is a flowchart of a control method for a permanent magnet synchronous motor according to an embodiment of the present invention. like figure 1 As shown, the control method of the permanent magnet synchronous motor inclu...
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The invention discloses a control method of a permanent magnet synchronous motor, comprising the following steps: during the running process of the motor, calculating the voltage vector V1 of the motor according to the d-axis current id and the q-axis current iq of the motor; controlling the q-axis current iq It is 0 to obtain the minimum value V1m of the voltage vector of the motor according to the voltage vector V1 of the motor; judge whether the minimum value V1m is greater than or equal to the times of the DC bus voltage Vdc; and if the minimum value V1m is greater than or equal to the times of the DC bus voltage Vdc, then control the driver The active component output to the motor is zero. The control method can effectively ensure that the permanent magnet synchronous motor works in the electric state during the whole power cycle. The invention also discloses a control device of the permanent magnet synchronous motor and a permanent magnet synchronous motor.
Description
technical field [0001] The invention relates to the technical field of motors, in particular to a control method for a permanent magnet synchronous motor, a control device for a permanent magnet synchronous motor and a permanent magnet synchronous motor. Background technique [0002] With the improvement of users' energy-saving requirements for electromechanical products, variable frequency motor drives with higher efficiency have been more and more widely used. [0003] Usually, the DC bus voltage of the variable frequency motor driver is in a stable state, and the inverter part is relatively independent from the input AC voltage such as the grid voltage, so that the control of the inverter part does not need to consider the instantaneous change of the input AC voltage, which is convenient for the realization of the control method. In order to ensure that the DC bus voltage is in a stable state, electrolytic capacitors with large capacitance are usually equipped, but this w...
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IPC IPC(8): H02P21/26
Inventor 肖有文
Owner GD MIDEA AIR-CONDITIONING EQUIP CO LTD