CN2402052Y

CN2402052Y - DC motor excitation rectifier using converter

Info

Publication number: CN2402052Y
Application number: CN 99253891
Authority: CN
Inventors: 张世义; 吴海青
Original assignee: ELECTRIC CONTROL EQUIPMENT FACTORY TIANJIN CITY
Current assignee: ELECTRIC CONTROL EQUIPMENT FACTORY TIANJIN CITY
Priority date: 1999-11-11
Filing date: 1999-11-11
Publication date: 2000-10-18
Anticipated expiration: 2009-11-11

Abstract

The utility model relates to a DC motor excitation rectifier using a converter. An excitation winding L of a DC motor D is connected with a three-phase AC supply through an excitation rectifying device LCZ to carry out power supply. The excitation rectifying device LCZ is composed of a rectifier Z and a resistor R which are in parallelly connected. The utility model can effectively realize the four-quadrant running and the digital control of the DC motor. The utility model has the advantages of simple structure, convenient installation, convenient adjustment, reliable running and low manufacturing cost of devices. The DC motor excitation rectifier using a converter can also be widely used for rebuilding an existing armature reversible control device into an excitation reversible control device.

Description

Utilize the DC motor excitation rectifier device of current transformer

The utility model relates to the improvement of electric motor control device, especially a kind of DC motor excitation rectifier device that utilizes current transformer.

At present in industrial production, can normally operation in the four-quadrant scope in order to ensure DC motor, fully satisfying the requirement of difference in functionality, roughly can reduce two kinds to the control mode of its DC motor.That is: first armature reversible, it is to utilize DC digital speed regulating device (also abbreviating " current transformer " as), at the reversible and design control of the armature of DC motor.This control mode is under normal circumstances utilized, and can obtain better technical effect, but since the manufacturing of equipment, installation, debugging etc. all require technical conditions higher, consume one's energy morely, cause the equipment price costliness.It two is excitation reversibles, and it is an excitation of utilizing different technical scheme control DC motor, to ensure the function that realizes DC motor.This control mode, under normal circumstances utilize, can obtain better technical effect too, yet its weak point still is: because four quadrant running and Digital Control in order to realize DC motor, can only adopt the control complexity in the known technology, expensive device and device, so also be difficult to reduce the device fabrication cost.

The purpose of this utility model is that a kind of improved DC motor excitation rectifier device that utilizes current transformer will be provided, and it can be realized the four quadrant running of DC motor effectively and carry out Digital Control, simplified structure, reduction equipment cost.

The purpose of this utility model is achieved in that the excitation winding L of DC motor D, connects three-phase alternating-current supply through excitation rectifier device LCZ, powers, and the two is in parallel and constitutes excitation rectifier device LCZ by current transformer Z, resistance R.

The advantage of utility model: the four quadrant running and the Digital Control that can realize the DC motor of controlling effectively; Simple in structure, Installation and Debugging are convenient, and are reliable, reduced the device fabrication cost; Can also be widely used in the reversible control appliance of existing armature is transformed into the reversible control appliance of excitation.

The concrete structure of utility model is provided by following embodiment and accompanying drawing thereof.

Fig. 1 is a kind of electrical schematic diagram that utilizes the DC motor excitation engagement positions of current transformer.

Describe details and working condition in detail below in conjunction with Fig. 1 according to the concrete device that the utility model proposes.

This device comprises the armature of DC motor D, and ZLG connects three-phase alternating-current supply through the armature rectifier, powers; And the excitation winding L of this DC motor D connects three-phase alternating-current supply equally through excitation rectifier device LCZ, powers; The two is in parallel and constitutes excitation rectifier device LCZ by current transformer Z, resistance R.

Said current transformer Z (being the DC digital speed regulating device), it is to design according to the parameters (as commutation zero current detection, controllable silicon commutation time etc.) of the armature control of DC motor D, is the stronger adjusting device of specific aim.Yet because the excitation winding L of DC motor D compares with armature winding, the inductance of excitation winding L is bigger, show bigger difference is also arranged on the electric current, the thyristor turn-off time of current transformer Z and the reaction of zero current are also far from each other, and these then constitute the reason that current transformer Z can not be directly used in the control exciting current.After current transformer Z in the technical program, the resistance R the two be in parallel (the excitation winding L that is DC motor D goes up parallel resistance R), the effect of the inductance in this loop is reduced relatively, can shorten current transformer Z the thyristor turn-off time (because of as early as possible just less than silicon controlled keep electric current), simultaneously also make the commutation zero current significantly reduce, thus in the collection of parameter with close the getting final product of the reversible control device of said armature.Be noted that the resistance value problem about resistance R at last, in view of the concrete technical parameter difference of DC motor D, operating mode is different, then should determine the resistance value of selecting for use by designing and calculating.Should be noted also that because the voltage ratio of the excitation winding L of general DC motor D is low than the voltage of armature winding, so the voltage that drops on the resistance R can be too not high, its power is also little, so the volume of resistance R can be corresponding less.

Claims

1. a DC motor excitation rectifier device that utilizes current transformer by DC motor D armature, through armature rectifier ZLG connection three-phase alternating-current supply, is powered; And organic connection such as the excitation winding L of DC motor D, current transformer Z, resistance R forms, the excitation winding L that it is characterized in that DC motor D, connect three-phase alternating-current supply equally through excitation rectifier device LCZ, power, the two is in parallel and constitutes excitation rectifier device LCZ by current transformer Z, resistance R.