CN2439139Y

CN2439139Y - Synchro motor silicon controlled magnetizing exciter capable of on-line changing controller

Info

Publication number: CN2439139Y
Application number: CN00221321U
Authority: CN
Inventors: 戴民孝
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-08-04
Filing date: 2000-08-04
Publication date: 2001-07-11
Anticipated expiration: 2010-08-04

Abstract

The utility model relates to a synchro motor silicon controlled magnetizing exciter capable of on-line changing a controller and uses a semi-controlled three-phase bridge rectifier circuit as a main returning circuit. The synchro motor silicon controlled magnetizing exciter capable of on-line changing a controller is at least provided with a magnetic turning off circuit, a control circuit and a control circuit power supply, wherein, the control circuit at least comprises a synchronous phase shift triggering circuit, a thrown exciting circuit and a relay control circuit, and the magnetic turning off circuit is composed of controlled silicon, a resistor and a diode. The magnetic turning off circuit is characterized in that in the magnetic turning off circuit, the controlled silicon is connected with the resistor in series after the controlled silicon is reversely connected with the diode in parallel, the controlled silicon, the diode and the resistor are integrally bridged between the output ends of the rectifier circuit, and a cathode and an anode of the controlled silicon and a negative electrode and a positive electrode of the output of the rectifier circuit present in the positive condition. The control circuit is made into the controller with integral structure, and the controller is electrically connected with the main returning circuit through an inserted teasing type interface. When the controller has fault, the synchro motor silicon controlled magnetizing exciter capable of on-line changing a controller can maintain the continuous operation of a three-phase synchro motor and on-line change the controller.

Description

Synchronous motor thyristor excitation device that can online more changer controller

The utility model relates to a kind of three-phase synchronous motor thyristor excitation device, is specifically related to a kind of three-phase synchronous motor thyristor excitation device that can online more changer controller.

In the prior art, the thyristor excitation device of three-phase synchronous motor generally adopts semi-controlled three-phase bridge rectifier circuit and demagnetization circuit as major loop, constitute control circuit and encourage control circuit etc. by synchronous, trigger impulse circuit, phase-shift circuit, throwing, structurally, above-mentioned control circuit generally adopts the weak current part (being controller) in the polylith wiring board formation baseset, finishing the control of the throwing of whole excitation unit being encouraged functions such as time, lock-out pulse, phase shift and constant voltage, is the core of excitation unit.In actual the use; in a single day controller as the core breaks down; must cause the shutdown of excitation unit; because this synchronous motor excitation unit generally is used for powerful synchronous motor, shutdown can cause bigger loss during work, thereby how to improve the excitation unit of synchronous motor; when controller is broken down; excitation unit can be kept the work of motor in " out of control " following a period of time of operating mode, with timely replacing control circuit, become the problem that everybody pays close attention to.

The utility model purpose provides a kind of when controller breaks down, and also can keep three-phase synchronous motor and move continuously, and thyristor excitation device that can online more changer controller.For achieving the above object, the technical solution adopted in the utility model is: a kind of synchronous motor thyristor excitation device that can online more changer controller, with the semi-controlled three-phase bridge rectifier circuit is major loop, and set demagnetization circuit at least, control circuit and control circuit power supply constitute, control circuit comprises synchronously at least, phase-shift trigger circuit, circuit and control relay circuit are encouraged in throwing, demagnetization circuit is by controllable silicon, resistance and diode are formed, wherein, connect with resistance after controllable silicon and the diode reverse parallel connection, and integral body is connected across between the rectification circuit output end, and the negative pole and the positive pole of silicon controlled negative electrode and anode and rectification circuit output are forward condition; Described control circuit is made integrally-built controller, and controller is electrically connected with major loop by the pulling and inserting type interface.

In the technique scheme, described " semi-controlled three-phase bridge rectifier circuit " can be the controllable silicon semi-controlled three-phase bridge rectifier circuit of anode altogether, also can be the semi-controlled three-phase bridge rectifier circuit of controllable silicon common cathode.In the described demagnetization circuit " negative pole and the positive pole of the output of silicon controlled negative electrode and anode and rectification circuit are forward condition " comprise two kinds of annexations, the anode of first silicon controlled negative electrode and diode connects the negative pole of rectification circuit output, and the negative electrode of silicon controlled anode and diode connects the positive pole of rectification circuit output through resistance; It two is that the anode of silicon controlled negative electrode and diode connects the negative pole of rectification circuit output through resistance, and the negative electrode of silicon controlled anode and diode connects the positive pole of rectification circuit output.

In the technique scheme, described control circuit power supply is provided with mains switch, and the control circuit power supply is connected with controller.

In the technique scheme, be provided with A.C. contactor between described major loop and the three-phase input main power source.Connect preferably and be, described major loop through rectifier transformer with import main power source and be connected, A.C. contactor is located on rectifier transformer elementary.

Further technical scheme can be set up the spare controller of a cover excitation unit, and spare controller can be electrically connected with major loop by the pulling and inserting type interface.

The utility model operation principle is: when certain control circuit in the controller breaks down and causes the synchronous triggering pulse to stop, because in fact the connection of demagnetization circuit has cancelled fly-wheel diode, the inductive discharge of motor excitation winding causes afterflow, a controllable silicon of conducting at that time can't turn-off in the major loop and make, enter " out of control " operating mode, rely on this silicon controlled conducting, major loop works on, thereby keep the operation of synchronous machine, at this moment, because control circuit is made integrally-built controller, only need more transducer set controller, the plug-in interface is pulled up from the controller that damages, be inserted on the new controller, can recover operate as normal.In order to guarantee the safe and reliable of online more changer controller, before changer controller more, preferably cut off the control circuit power supply earlier, more behind the changer controller, open the control circuit power supply again, make field circuit enter nominal situation.In addition,, when shutdown, may cause shutdown " out of control ", therefore can between major loop and three-phase input main power source, A.C. contactor be set, guarantee to cut off when excitation unit is shut down three-phase input power supply because this circuit has been cancelled fly-wheel diode.

Because the technique scheme utilization, the utility model compared with prior art has following advantage:

1, because the utility model has changed the syndeton of demagnetization circuit; and control circuit made the integrally-built controller that has the pulling and inserting type interface; therefore when controller breaks down; also can keep three-phase synchronous motor moves continuously; and can online more changer controller; guaranteed the continuity of production process, in case and the prior art controller breaks down, can only shut down maintenance or changer controller more.

2, because the utility model demagnetization circuit has been cancelled fly-wheel diode, and on the demagnetization controllable silicon reverse parallel connection diode, thereby obtain and the identical asynchronous starting characteristic of full control excitation steady no pulsating when making electric motor starting.

3, spare controller is set after because can online more changer controller, two controllers can move in turn, have guaranteed the excitation unit long-term stable operation.

Accompanying drawing 1 is the utility model operation principle block diagram;

Accompanying drawing 2 is three-phase half controlled bridge formula rectification major loop and demagnetization circuit figure among the utility model embodiment;

Below in conjunction with drawings and Examples the utility model is further described:

Embodiment: referring to attached illustrated in figures 1 and 2, a kind of synchronous motor thyristor excitation device that can online more changer controller, with one group of controllable silicon V1, V3, V5 is anode and one group of diode V2 altogether, V4, it is major loop that the V6 series connection constitutes semi-controlled three-phase bridge rectifier circuit, and set demagnetization circuit at least, control circuit and control circuit power supply constitute, control circuit comprises synchronously at least, phase-shift trigger circuit, circuit and control relay circuit (these circuit no longer describe in detail for existing custom circuit structure) are encouraged in throwing, demagnetization circuit is by controllable silicon V7, resistance R FD and diode V8 form, wherein, connect with resistance R FD behind controllable silicon V7 and the diode V8 reverse parallel connection, the anode of the negative electrode of controllable silicon V7 and diode V8 meets the negative pole L-of rectification circuit output, and the negative electrode of the anode of controllable silicon V7 and diode V8 meets the anodal L+ of rectification circuit output through resistance R FD; Described control circuit is made integrally-built controller LCKZ (1), and controller LCKZ (1) is electrically connected with major loop by pulling and inserting type interface 1KC, for ease of changing, is provided with the spare controller LCKZ (2) that a cover has pulling and inserting type interface 1KC; Described control circuit power supply is provided with mains switch SA3, and the control circuit power supply is connected by plug-in interface 1KC with controller LCKZ (1).Described major loop is connected with the input main power source through rectifier transformer, and A.C. contactor is located on rectifier transformer elementary.

In order to make excitation unit work more reliable, select suitable rectifier transformer no-load voltage ratio when design, when " out of control " operating mode occurring, the output voltage that makes excitation unit is 68% (empirical equation) of rated voltage, this voltage can satisfy the operate as normal of motor a little less than motor rated excitation voltage; In addition, during because of " out of control " operating mode, the load current of rectifier bridge only flows through a controllable silicon, has suitably improved rectifier bridge silicon controlled capacity in actual fabrication, and embodiment selects greater than the silicone tube of load current more than one times.

Claims

1, a kind of synchronous motor thyristor excitation device that can online more changer controller, with the semi-controlled three-phase bridge rectifier circuit is major loop, and set demagnetization circuit at least, control circuit and control circuit power supply constitute, control circuit comprises synchronously at least, phase-shift trigger circuit, circuit and control relay circuit are encouraged in throwing, demagnetization circuit is by controllable silicon, resistance and diode are formed, it is characterized in that: in the described demagnetization circuit, connect with resistance after controllable silicon and the diode reverse parallel connection, and integral body is connected across between the rectification circuit output end, and the negative pole and the positive pole of silicon controlled negative electrode and anode and rectification circuit output are forward condition; Described control circuit is made integrally-built controller, and controller is electrically connected with major loop by the pulling and inserting type interface.

2, excitation unit according to claim 1 is characterized in that: described control circuit power supply is provided with mains switch, and the control circuit power supply is connected with controller.

3, excitation unit according to claim 1 is characterized in that: be provided with A.C. contactor between described major loop and the three-phase input main power source.

4, excitation unit according to claim 3 is characterized in that: described major loop is connected with the input main power source through rectifier transformer, and A.C. contactor is located on rectifier transformer elementary.

5, excitation unit according to claim 1 is characterized in that: set up the spare controller of a cover excitation unit, spare controller can be electrically connected with major loop by the pulling and inserting type interface.