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A soft starter for single-phase motor and single-phase motor with same

A single-phase motor and soft starter technology, which is applied to the starter of a single single-phase induction motor, motor generator/starter, electric/electric converter, etc., can solve the problem of low reliability and long starting time of soft starters , starting current harmonics and other issues

Inactive Publication Date: 2007-05-16
EMERSON ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, using a thyristor soft starter to start the motor takes a long time to start, and the starting current will generate serious harmonics, resulting in poor low-voltage starting capability of the single-phase motor
Since this kind of soft starter includes more components, such as the control circuit for controlling the bidirectional thyristor, 1 starting capacitor, and 3 relays, the reliability of the whole soft starter is low
Also, thyristor soft starters are costly

Method used

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  • A soft starter for single-phase motor and single-phase motor with same
  • A soft starter for single-phase motor and single-phase motor with same

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Embodiment Construction

[0025] It is believed that the above and other objects, features and advantages of the present invention will become clearer through the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings.

[0026] Fig. 1 and Fig. 2 are single-phase motor starters in the prior art, which have been described in detail in the background technology section, and their descriptions are omitted here.

[0027] Fig. 3 is a schematic diagram of a single-phase motor soft starter according to an embodiment of the present invention. As shown in Figure 3, a single-phase motor at least includes a main winding 301, a starting winding 302 and a running capacitor 303, wherein the main winding 301 and the starting winding 302 are connected in series, and the connection point is C, and the running capacitor 303 is connected with the main winding 301 and the running capacitor 301 connected in series. The starting windings 302 are connected...

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Abstract

The invention provides a soft startup device for single-phase motor. Wherein, the motor at least includes a primary winding connected with a startup winding in series, and a running capacitor paralleled with windings. The provided soft startup device comprises: a reactor connected with primary winding in series, and an ac contactor with coil paralleled with the startup winding to work and bypass the reactor when motor rotation speed up to threshold. This invention reduces startup current and time.

Description

technical field [0001] The invention relates to a single-phase motor, in particular to a soft starter for the single-phase motor and a single-phase motor with the soft starter. Background technique [0002] There are two ways to start a single-phase motor (hereinafter also referred to as a motor), direct start and soft start. Direct starting is full-voltage starting. In this way, the starting current of the single-phase motor is large, and the impact on the power grid is also large; while soft starting basically starts the motor by reducing the starting voltage, thereby reducing the starting of the motor. current. [0003] FIG. 1 is a schematic diagram of a high-torque starter for a single-phase motor using direct starting in the prior art. As shown in Figure 1, the high-torque starter includes: a starting capacitor 11 and a voltage relay 12, wherein the starting capacitor 11 is connected in parallel with the running capacitor 101 of the motor, and is connected in parallel...

Claims

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Application Information

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IPC IPC(8): H02P1/44H02K11/00
CPCH02P1/445
Inventor 曹平山尤军
Owner EMERSON ELECTRIC CO
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