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Device and method for back electromotive force test during commutation of permanent magnet synchronous motor

A technology of permanent magnet synchronous motor and back electromotive force, which is applied in the direction of motor generator testing, measuring devices, measuring current/voltage, etc. It can solve the problem that the back electromotive force cannot be directly observed, achieve the goal of optimizing the feedback control coefficient and improving the control accuracy Effect

Active Publication Date: 2020-11-24
ZHEJIANG DONGFANG ELECTROMECHANICAL
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  • Claims
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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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  • Device and method for back electromotive force test during commutation of permanent magnet synchronous motor
  • Device and method for back electromotive force test during commutation of permanent magnet synchronous motor

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Embodiment Construction

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

[0029] It should be understood that terms such as "having", "including" and "including" used herein do not equate 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 back-EMF test device during the commutation process of a permanent magnet synchronous motor, which includes an inverter circuit, an absorption 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 terminal of the inverter circuit is connected to the permanent magnet synchronous The three-phase stator winding of the m...

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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 device and method for testing back electromotive force 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 promoted and applied. Compared with traditional electrically excited synchronous motors, permanent magnet synchronous motors, especially rare earth permanent magnet synchronous motors, have the advantages of less loss, high efficiency and obvious power saving effects. The permanent magnet synchronous motor uses permanent magnets to provide excitation, which makes the motor structure simpler, reduces the processing and ass...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/34G01R19/00
CPCG01R19/00G01R31/34
Inventor 郑秋吴金富
Owner ZHEJIANG DONGFANG ELECTROMECHANICAL
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