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Three-phase synchronous motor drive control system and control method

A three-phase synchronous, drive control technology, applied in the direction of single motor speed/torque control, etc., can solve the problems that are not seen in permanent magnet synchronous motors

Active Publication Date: 2015-11-25
ZHUHAI GREE REFRIGERATION TECH CENT OF ENERGY SAVING & ENVIRONMENTAL PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially in the permanent magnet synchronous motor, there is no application of switching winding connection mode

Method used

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  • Three-phase synchronous motor drive control system and control method
  • Three-phase synchronous motor drive control system and control method
  • Three-phase synchronous motor drive control system and control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Taking the permanent magnet motor as an example, the implementation of the three-phase synchronous motor drive control system is described with reference to the accompanying drawings.

[0054] The present invention provides a three-phase synchronous motor drive control system, such as figure 1 As shown, the system includes a three-phase synchronous motor 1, a stator winding connection switching device 2 and a frequency converter 3, and the frequency converter 3 is electrically connected to the three-phase synchronous motor 1 and the stator winding connection switching device 2 respectively, wherein:

[0055] The three-phase synchronous motor drive control system includes a motor drive circuit; the three-phase synchronous motor drive control system is controlled by a three-phase synchronous motor 1, a motor drive circuit composed of a stator winding wiring switching device 2 and a frequency converter 3, such as Figure 1a Analysis of the schematic structure of the motor ...

Embodiment 2

[0080] Refer below Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 The three-phase synchronous motor drive control system provided by the second embodiment of the present invention is described.

[0081] Embodiment 2 is similar to the structure of the three-phase synchronous motor drive control system in Embodiment 1, but the structure and circuit of some parts of the system are not completely the same. Among them, the structure of the connection relationship between other components and various devices is the same, and the similarities will not be repeated. .

[0082] Embodiment two:

[0083] The specific technical features about the winding connection method in the second embodiment are specifically defined in the first embodiment about the winding connection method.

[0084] Specifically, when the motor is lower than the preset operating frequency, the stator winding adopts a connection method with fewer parallel branches. When the motor reache...

Embodiment 3

[0094] Taking the reluctance motor as an example, the implementation scheme of the three-phase synchronous motor drive control system is described with reference to the accompanying drawings.

[0095] In the third embodiment of the present invention, the structure of the three-phase synchronous motor drive control system in the third embodiment is similar to that in the first embodiment, but the difference is that the three-phase synchronous motor in the system is a reluctance motor, and other components and various The structure of the connection relationship between the devices is the same, and the similarities will not be repeated here.

[0096] Further, the stator windings are star-connected when the motor is lower than the preset operating frequency, and when the motor reaches or exceeds the preset operating frequency, the stator winding connection switching device is used to change the connection mode of the motor windings to a delta connection. The specific switching pr...

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PUM

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Abstract

The invention discloses a three-phase synchronization electric motor drive control system and control method. The method comprises: detecting the running frequency of an electric motor in real time, when the running frequency of the electric motor is lower than a preset running frequency, controlling a stator winding wiring switching device to select a wire counterelectromotive force constant or a winding connection mode with quite high inductance for an electric motor winding; and when the running frequency is equal to or greater than the preset running frequency, controlling the stator winding wiring switching device to select a wire electromotive force constant or a winding connection mode with quite low inductance for the electric motor winding, and selecting electric motor driving parameters corresponding to the winding connection mode for performing driving control. According to the invention, by changing the winding connection mode of an electric motor, the electric motor is enabled to employ a winding connection mode with a high counterelectromotive force during low-frequency running for reducing winding current and reducing loss of a controller; and during high-frequency running, a winding connection mode with a low counterelectromotive force is adopted so that the maximum running frequency of the electric motor can be ensured, and the overall energy efficiency of the electric motor and the controller is improved at the same time.

Description

technical field [0001] The invention relates to the technical field of motor equipment, in particular to a three-phase synchronous motor drive control system and control method. Background technique [0002] Due to its high efficiency and good speed regulation performance, the permanent magnet synchronous motor is more and more widely used. In the design of the existing permanent magnet synchronous motor, in order to ensure that the motor can maintain sufficient output speed and output when the maximum terminal voltage is fixed. The design of torque, motor back EMF and inductance parameters has the maximum limit, [0003] The maximum speed of the permanent magnet synchronous motor is inversely proportional to the back EMF: [0004] Ω max = u lim p ( ψ f - ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P6/08
Inventor 肖勇唐成文
Owner ZHUHAI GREE REFRIGERATION TECH CENT OF ENERGY SAVING & ENVIRONMENTAL PROTECTION