CN2232640Y

CN2232640Y - Efficient brake for electric motor

Info

Publication number: CN2232640Y
Application number: CN 95206547
Authority: CN
Inventors: 李叶江
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-03-30
Filing date: 1995-03-30
Publication date: 1996-08-07
Anticipated expiration: 2005-03-30

Abstract

The utility model relates to a stop device for motors, particularly a stop device which is used for AC motors and adopts a motor supplying straight current method. The high efficiency brake for motors is composed of a rectifier U and a capacitor C, or a rectifier U, a capacitor C and a transformer T, wherein, the AC end of the rectifier is connected with any phase and the zero line of the power supply of a motor M or the secondary electrode of the transformer T, and the primary electrode of the transformer T is connected with any two phases of the power supply of the motor M; both ends of the capacitor C is in parallel connection with the other two phases of the power supply of the motor M and the DC end of the rectifier U. The utility model has the advantages of high efficiency and simple structure and can be used on three-phase motors with middle and small power.

Description

The motor effective brake

The utility model relates to the arresting stop of motor, in particular for arresting stop alternating current motor, that adopt the method for supplying with the motor direct current.

The arresting stop of alternating current motor has multiple patterns such as reversal connection phase sequence, short circuit or resistance braking, supply motor direct current, electricity and mechanically combining braking.

The purpose of the utility model just is to adopt the method for supplying with the motor direct current, provide a kind of efficiently, novel motor brake simple in structure.

The motor effective brake perhaps is made up of rectifier U, capacitor C and transformer T rectifier U and capacitor C.The arbitrary phase and the zero line of the interchange termination motor M power supply of rectifier U perhaps connect the secondary of transformer T, and the elementary two-phase of appointing that connects motor M power supply of transformer T.The two ends of capacitor C also connect the two-phase in addition of motor M power supply and the dc terminal of rectifier U.

Below in conjunction with embodiment shown in the drawings, the utility model is explained in detail.

Accompanying drawing 1 and accompanying drawing 2 are schematic top plan view and electrical schematic diagrams of embodiment one, and accompanying drawing 3 and accompanying drawing 4 are schematic top plan view and electrical schematic diagrams of embodiment two.

Embodiment one as shown in Figures 1 and 2, the motor effective brake is made up of rectifier U and capacitor C.The arbitrary phase and the zero line of the interchange termination motor M power supply of rectifier U are as U in the accompanying drawing 2 and N.The two ends of capacitor C also connect the two-phase in addition of motor M power supply and the dc terminal of rectifier U, as V in the accompanying drawing 2 and W two-phase.

Embodiment two shown in accompanying drawing 3 and accompanying drawing 4, the motor effective brake is made up of rectifier U, capacitor C and transformer T.The interchange termination transformer T's of rectifier is secondary, and the elementary two-phase of appointing that connects motor M power supply of transformer T, as U in the accompanying drawing 4 and V two-phase.The two ends of capacitor C also connect the two-phase in addition of motor M power supply and the dc terminal of rectifier U, as V in the accompanying drawing 4 and W two-phase.

Certainly, rectifier U can use full-wave rectifier, also available half-wave rectifier; Can pile with rectifier bridge, also can use rectifying tube.Should be connected to often opening or normally closed interlock of A.C. contactor between four lead-out wires of

brake

1,2,3,4 and the motor M power line, the KM1-4 in accompanying drawing 2 and the accompanying drawing 4 for example, KM1 1 and KM1-6.

The operation principle of motor effective brake is: click the start button of motor M, contactor coil gets electric, normally opened contact KM1-1～4 closure, and normally-closed contact KM1-5～6 disconnects, motor M running, rectifier U gets electric, capacitor C charging.Click the stop button of motor M, the contactor coil dead electricity, normally opened contact KM1-1～4 disconnect, normally-closed contact KM1-5～6 closure, motor M shuts down, rectifier U dead electricity, and the direct voltage at capacitor C two ends is added on the V and W two-phase of motor M, produce one with the opposite magnetic field of motor M rotation direction, motor M is shut down rapidly.

Obviously, the utlity model has efficient, advantages of simple structure and simple, can be widely used on the threephase motor of middle low power.

In the embodiment shown in accompanying drawing 1 and the accompanying drawing 2, rectifier U QSZ series silicon dridge type rectistack, the capacity of capacitor C is 4000 microfarads, withstand voltage 450V.In the embodiment two shown in accompanying drawing 3 and the accompanying drawing 4, rectifier U also uses QSZ series silicon dridge type rectistack, and the capacity of capacitor C is 20000 microfarads, withstand voltage 50V, and the elementary of transformer T is 380V, secondary is 30V.

Claims

1, a kind of motor effective brake is characterized in that it by rectifier U and capacitor C, perhaps is made up of rectifier U, capacitor C and transformer T; The arbitrary phase and the zero line of the interchange termination motor M power supply of rectifier U perhaps connect the secondary of transformer T, and the elementary two-phase of appointing that connects motor M power supply of transformer T; The two ends of capacitor C also connect the two-phase in addition of motor M power supply and the dc terminal of rectifier U.