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Variable frequency energy saving device for low-voltage three-phase asynchronous motor control system

An asynchronous motor, three-phase asynchronous technology, applied in the direction of AC motor control, control system, starter of a single multi-phase induction motor, etc., can solve the problem of load power factor and load power cannot be adjusted.

Inactive Publication Date: 2012-02-29
ANHUI HETIAN ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] In view of the above defects, the present invention provides a frequency conversion energy-saving device for a low-voltage three-phase asynchronous motor control system, which solves the problem that the existing three-phase asynchronous motor control method cannot adjust the power factor of the load and the load power

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  • Variable frequency energy saving device for low-voltage three-phase asynchronous motor control system
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  • Variable frequency energy saving device for low-voltage three-phase asynchronous motor control system

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Embodiment Construction

[0029] Such as image 3 As shown, a structural schematic diagram of a specific embodiment of a frequency conversion energy-saving device for a low-voltage three-phase asynchronous motor control system according to the present invention is provided. The frequency conversion energy-saving device for a low-voltage three-phase asynchronous motor control system includes an asynchronous motor 1, an AC contactor 3, The circuit breaker 4 and the frequency converter 7, the asynchronous motor 1, the frequency converter 7, the AC contactor 3 and the circuit breaker 4 are elastically connected in series in sequence.

[0030] Such as figure 1 As shown, when starting directly, the asynchronous motor 1 is directly started to run through the AC contactor 3, and the thermal relay 2 serves as thermal overload protection of the asynchronous motor 1. During star-delta start, the asynchronous motor 1 is in the star decompression start mode, and after the delay start is completed, the asynchronous...

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Abstract

The invention discloses a variable frequency energy saving device for a low-voltage three-phase asynchronous motor control system. The device comprises an asynchronous motor, an alternating current contactor and a circuit breaker, and further comprises a frequency converter, wherein the asynchronous motor, the frequency converter, the alternating current contactor and the circuit breaker are sequentially elastically connected in series. By the device, the conventional frequency converter is connected to the low-voltage three-phase asynchronous motor control system to realize regulation control over a power factor and load power of a load; and compared with the conventional control system, the low-voltage three-phase asynchronous motor control system has better energy saving effects.

Description

technical field [0001] The invention relates to an AC low-voltage three-phase asynchronous motor, in particular to a frequency conversion energy-saving device for a low-voltage three-phase asynchronous motor control system. Background technique [0002] The current control and working methods of three-phase asynchronous motors can be divided into the following categories: [0003] a. Direct start control mode, power frequency operation; [0004] b. Star-delta starting control mode, power frequency operation; [0005] c. Autotransformer start-up control mode, power frequency operation; [0006] d. Frequency-sensitive rheostat start-up control mode (rotor wire-wound asynchronous motor), rotor frequency conversion start (large frequency difference), power frequency operation; [0007] e. Soft start control mode, power frequency operation. [0008] Among the above-mentioned control methods, the starting methods of types a and b are suitable for applications with small power ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P27/04H02J3/18H02P1/30
CPCY02E40/30
Inventor 裴古炎潘书祥柯有玺刘彩
Owner ANHUI HETIAN ELECTRIC