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DC motor with commutator and its driven washing machine

A technology of DC motors and commutators, applied in the field of washing machines, can solve problems such as unavoidable overvoltage, complicated reliability and cost of brush machinery and circuit structures, and inability to meet the freewheeling time, etc., and achieve a firm mechanical and circuit structure Simple, excellent speed regulation characteristics, and the effect of improving life

Active Publication Date: 2005-08-03
JINLING ELECTRICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the working arc length of the auxiliary brush is limited by its volume, so it often cannot meet the requirements of the freewheeling time, and it is difficult to avoid overvoltage; the mechanical and circuit structure of the brush is complicated, which also creates new reliability and cost problems.

Method used

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  • DC motor with commutator and its driven washing machine
  • DC motor with commutator and its driven washing machine
  • DC motor with commutator and its driven washing machine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0037] The working process of the embodiment DC motor can refer to image 3 The waveform of the potential U2a of the brush 2a shown:

[0038] The rotor drives the brush plate 3 to rotate clockwise, the brush 2a first contacts the positive pole commutator piece 11, U2a is the potential +V of the positive pole L1 of the power supply device; at the time t=t1, it rotates until it contacts the freewheeling commutator piece 12, maintaining The induced electromotive force in the original current direction makes the semiconductor diode VD2 conduct, and U2a changes to the potential -V of the negative pole L2 of the power supply device, until the freewheeling is completed to 0; it continues to rotate until it contacts the negative commutator piece 13, and U2a is the negative pole L2 of the power supply device. At the moment t=t2, it rotates to contact the freewheeling commutator 14, the induced electromotive force makes the semiconductor diode VD1 conduct, and U2a changes from -V to +V ...

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Abstract

This invention relates to a DC motor with a commutator and a washing machine driven by it. Its brush at the rotor is connected with the phase windings of the pivot phase by phase, the commutator is set at the stator, the positive and negative commutator bars are isolated by continuous commutator bars distributed alternately along the rotary face relating to the shaft. The two bars are connected with the first pole of the power supply device, two semiconductor diodes or valves with the opposite conduction direction to the supply cross over the second pole of the supply after serial connection, its serial points are connected to the continuous commutator bars.

Description

technical field [0001] The invention relates to a DC motor with a commutator and a washing machine driven by the same. In the International Patent Classification, the classification belongs to H02K13 / 10 and D06F33 / 02. Background technique [0002] As we all know, DC motor has excellent speed regulation performance and simple speed regulation control circuit. The structure of a traditional DC motor with a commutator includes: a commutator located on the rotor and each phase winding of the armature, a brush and a magnetic pole located on the stator, and a power supply device. During the commutation process of the motor, overvoltage is often generated due to the unsteady contact between the brush and the commutator or the sudden change of the commutation current, and there are sparks and electromagnetic interference that seriously damage the life of the commutator, thus limiting the use of the motor range, including applications in washing machines. The prior art washing mach...

Claims

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Application Information

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IPC IPC(8): D06F33/02H02K13/04H02K13/10
Inventor 区长钊
Owner JINLING ELECTRICAL CO LTD
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