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Three-phase AC asynchronous motor and its starting method and device

An asynchronous motor, three-phase AC technology, used in asynchronous induction motors, starters of single multi-phase induction motors, motor generators/starters, etc., can solve the problems of high cost, large volume and high quality of autotransformers , to achieve huge economic and social benefits, saving ferromagnetic materials and non-ferrous metals

Active Publication Date: 2018-06-01
南通嘉泉机械设备科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the autotransformer is large in size, high in quality and high in cost.
In particular, autotransformers need to use ferromagnetic materials and electromagnetic wires, which are high energy consumption and high carbon emission products, which are not conducive to low-carbon environmental protection

Method used

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  • Three-phase AC asynchronous motor and its starting method and device
  • Three-phase AC asynchronous motor and its starting method and device
  • Three-phase AC asynchronous motor and its starting method and device

Examples

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Effect test

Embodiment 1

[0021] A starting device for a three-phase AC asynchronous motor, comprising a three-phase AC asynchronous motor, a starting contactor, a running contactor, a starting mode changeover switch, an automatic air switch, a fuse and a time relay, characterized in that the three-phase stator winding The one-phase winding is composed of two symmetrical windings. The starting contactor has five pairs of moving and closing main contacts, and the running contactor has four pairs of moving and closing main contacts, which are respectively connected to the stator and rotor windings of the three-phase AC asynchronous motor. Connection: When in the starting state, the five pairs of moving and closing main contacts of the starting contactor connect the two symmetrical windings in parallel, and at the same time connect them with the other two-phase windings to form a star connection; the starting is completed and enters the running state. The four pairs of moving and closing main contacts of t...

Embodiment 2

[0028] A three-phase AC asynchronous motor, including a three-phase stator winding and a cage rotor, is characterized in that one phase winding in the three-phase stator winding is composed of two symmetrical windings to form four sets of terminals, and one is set on the terminal board Double-pole double-throw switch, the knife blades of the double-pole double-throw switch are respectively connected to the head end of one winding and the end of the other winding in the two symmetrical windings of a phase winding, and the double-pole double-throw switch The upper gate of the throw switch is connected by wires to form a series circuit of two symmetrical windings, and the lower gate is respectively connected with the starting contactor and the running contactor to form a star-delta starting conversion control circuit. When the star-delta starting is performed, the two When the two symmetrical windings are connected in parallel, they are connected in a star connection with the othe...

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Abstract

The invention discloses an improvement of a three-phase alternating-current asynchronous motor and a starting method and relates to a star triangle starting apparatus of the three-phase alternating-current asynchronous motor. Two symmetrical windings divided by a three-phase alternating-current asynchronous motor w phase winding are firstly connected in parallel during starting and then are connected with a u phase winding and a v phase winding to form a star connection method. During operation, the two symmetrical windings of the w phase winding are firstly connected in series and then are connected to the u phase winding and the v phase winding to form a triangle connection method. An inductive reactance of star connection is reduced. After the motor is improved, a torque of the star connection method is greater than a torque of an ordinary-type star connection method so that the motor can smoothly start when a load is heavy. The motor, the method and the apparatus have advantages that a starting effect of an autotransformer starting circuit can be acquired without using an autotransformer so that the large and heavy autotransformer with a high price can be saved; the motor is popularized so that a lot of ferromagnetic materials and non-ferrous metals can be saved, which is good for green environmental protection; and great economic benefits and social benefits are possessed.

Description

technical field [0001] The invention discloses an improvement and a starting method for a three-phase AC asynchronous motor, and also relates to a star-delta starting device for the three-phase AC asynchronous motor. Background technique [0002] When the medium and large three-phase AC asynchronous motor is started directly, the starting current and starting torque are too large, so it is generally not allowed to start directly and a starting circuit is required. There are many kinds of starting circuits, such as variable frequency starting circuits, soft starting circuits, star-delta starting circuits, Yanbian triangle starting circuits, autotransformer starting circuits, reactor starting circuits and resistance starting circuits, etc. These starting circuits have their own advantages and disadvantages. By comprehensive comparison, when the power of the three-phase AC asynchronous motor is in the range of 10 kW to 100 kW, the star-delta starting circuit has the highest ove...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P1/32H02K17/12H02K17/16H02K17/30
CPCH02K17/12H02K17/16H02K17/30H02P1/32
Inventor 梁正
Owner 南通嘉泉机械设备科技有限公司
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