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Back electromotive force testing device and method in commutation process of permanent magnet synchronous motor

A permanent magnet synchronous motor, back electromotive force technology, applied in motor generator testing, measuring devices, measuring current/voltage and other directions, can solve the problem that the back electromotive force cannot be directly observed, and achieve the optimal feedback control coefficient and improve the control accuracy. Effect

Active Publication Date: 2019-01-04
ZHEJIANG DONGFANG ELECTROMECHANICAL
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Problems solved by technology

[0005] Another object of the present invention is to provide a back electromotive force testing device and method during the commutation process of a permanent magnet synchronous motor. technical problem

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  • Back electromotive force testing device and method in commutation process of permanent magnet synchronous motor
  • Back electromotive force testing device and method in commutation process of permanent magnet synchronous motor

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Embodiment Construction

[0028] The present invention will be further described in detail below in conjunction with the accompanying drawings, so that those skilled in the art can implement it with reference to the description.

[0029] It should be understood that terms such as "having", "comprising" and "including" as used herein do not entail the presence or addition of one or more other elements or combinations thereof.

[0030] Such as Figure 1-2 As shown, the present invention provides a counter electromotive force testing device in the commutation process of a permanent magnet synchronous motor, including: an inverter circuit, an absorbing circuit, a drag motor and a controller.

[0031] The inverter circuit is composed of three pairs of upper and lower bridge arms. The inverter circuit is a three-phase full-bridge inverter. Each bridge arm is provided with a reverse diode D. The output end of the inverter circuit is connected to the permanent magnet synchronous The three-phase stator winding...

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Abstract

The invention discloses a back electromotive force testing device and method in the commutation process of a permanent magnet synchronous motor. The device comprises an inverter circuit which is formed by three pairs of upper and lower bridge arms, an absorption circuit, a dragging motor which is selectively connected to a rotor shaft of the permanent magnet synchronous motor, and a voltage collector which collects voltages in stator windings of three phases, wherein each of the bridge arms is provided with a reverse connection diode, an output end of the inverter circuit is connected to the three-phase stator winding of a permanent magnet synchronous motor, a first end of the absorption circuit is connected to a corresponding phase stator winding, a second end of the absorption circuit isconnected between each pair of bridge arms, two ends of the absorption circuit are provided with a reverse switch, and the absorbing circuit includes a first switch Td. According to the invention, atechnical problem that the reverse electromotive force of the permanent magnet synchronous motor cannot be directly observed during the commutation process of the stator windings is effectively solved.

Description

technical field [0001] The present invention relates to the technical field of control of permanent magnet synchronous motors, and more specifically, the present invention relates to a counter electromotive force testing device and method during the commutation process of permanent magnet synchronous motors. Background technique [0002] In recent years, with the rapid development of power electronics technology, microelectronics technology, new motor control theory and rare earth permanent magnet materials, permanent magnet synchronous motors have been rapidly popularized and applied. Compared with the traditional electric excitation synchronous motor, the permanent magnet synchronous motor, especially the rare earth permanent magnet synchronous motor has the advantages of less loss, high efficiency and obvious power saving effect. The permanent magnet synchronous motor provides excitation with permanent magnets, which makes the structure of the motor relatively simple, red...

Claims

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Application Information

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IPC IPC(8): G01R31/34G01R19/00
CPCG01R19/00G01R31/34
Inventor 郑秋吴金富
Owner ZHEJIANG DONGFANG ELECTROMECHANICAL
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