【文章內(nèi)容簡介】 ion time to be greatly affected productivity and make full use of the motor Shock, so that the transition process shortest possible time is to improve the productivity of effective measures. To this end, you must use doubleloop system. Double closedloop speed control system means controlled feedback loop uses two links, by the speed of negative feedback as Outer Ring, coupled with current feedback system for the inner ring, Speed negative feedback signal with a speed regulator to control(ASR). Current negative feedback signals by curent regulator(ACR) to deal with. Speed feedback role is to maintain a constant speed. When the speed regulator(ASR) adopt proportionalintegral(PI) form and amplifier static Magnification great, basically can eliminates the static electrical brachistochrone, no steadystate error adjust, improve electrical characteristics of the mechanical hardness. Current negative feedback39。s effection is to limit the current maximum. and the Start and Brake under in line of the maximum, as well as the Central interference play inhibition ,improve the system of rapid and antijamming capability, allowing the system to easily stability.3 SCRMotor (KZ2D) System ComparisonIn KZ2D rapid reversible adjustment system, it can be divided into a circulation system and the NonCirculating system. circulation means not pass through load, In between the two groups SCR flow of current, it don39。t do useful work, also occupy the capacity of rectifier is an additional consumption, hence there must be restrictions on circulation. A Circulation System Positive Group bridge is rectifier to inverter, antigroup bridge is rectifier to inverter that the whole process would be carried out continuously. Because of a small number of circulation as the basic load of silicon controlled rectifier (SCR), it can make load current across the vacant region to improve the dynamic characteristics, it can guarantee current continuous reverse, thus obtaining fast, Smooth transition process. However circulation increase silicon controlled rectifier (SCR) and transformer39。s burden so that the increased capacity of and silicon controlled rectifier (SCR) and transformer. and power consumption of useless, especially for the highpower electric drive system is substantial power consumption, and for limit circulation, the loopcircuit must access to large volume, high prices39。 sharing reactor, thus increasing the cost of equipment investment. Logical Control NonCircuiting SystemIn the NonCircuiting system, it just need to add restriction current pulse and continuous current reactor. It can save the install equipment capacity of thyristor rectifier and transformers and reduce the cost of equipment, failure due to the change resulting from the accident rate less than a circulation system. Of course, To ensure that no circulation, it will inevitably exist for some reversing dead zone, impact of the transition process fast. And logic control NonCircuiting system will enable a group silicon controlled rectifier (SCR) work, Logic Circuit blockade with another group of trigger pulse, make the group silicon controlled rectifier (SCR) pletely blocked state, radically cut off circulation pathway. Logic control NonCircuiting system depends on the reliability of the basic logic devices, or blockade the group pulse, or blockade antigroup pulse, it just eitheror, the two groups must not be allowed to open at the same time. All these by the logic devices to control, as long as the logic devices reliable, the system will be reliable work. Dislocation NonCircuiting SystemThe system is using silicon controlled rectifier(SCR) trigger pulse initial phase dislocation setting to achievable, that is, two trigger pulse phase staggered far, Z + F=300176。 or 360176。. Although the two groups have silicon controlled rectifier(SCR) trigger pulse, but when the pulse inverter group here, Its silicon controlled rectifier(SCR) ponents still in reverse blocking state. it is impossible to conduction, They will have no circulation. The control system is relatively simple, but such a system is a late to appear, operating limited experience, therefore, in reality, is seldom to use. With the research and use of unceasing improving of Logic NonCircuiting System at home and abroad, Logical elements are increasingly high quality, thereby ensuring the reliability of the system. Therefore, the pushreversible motor speed control system on the use of logic control noncirculating system.4 The Control Loop Structure Design of the Main Links Trigger DesignRole of Trigger is producing a certain power and pulse width of the trigger signal, making silicon controlled rectifier(SCR) conduction. With the phase shifter, and the phase shift within the pulse transpose, silicon controlled rectifier(SCR) control angle so that the size can change. For each cycle in the same perspective triggered thyristor, trigger signal must to be synchronized voltage thyristor power, otherwise it will be silicon controlled rect