CN2162737Y

CN2162737Y - Brake cabable for three-phase alternating current star connetion motor

Info

Publication number: CN2162737Y
Application number: CN 93214308
Authority: CN
Inventors: 罗乃张
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-05-25
Filing date: 1993-05-25
Publication date: 1994-04-20
Anticipated expiration: 2003-05-25

Abstract

The utility model relates to a brake which is suitable for a three-phase alternating current star connection motor. The utility model is characterized in that the Y-shaped points of a motor are disconnected, and the Y-shaped points are connected with a three-phase bridge rectifier circuit which is provided with braking coils. The utility model has the advantages of fast braking speed, good positioning effect, simple manufacturing technique, low material consumption and low cost. The braking speed of the utility model is smaller than 0.02 seconds. After the power supply is switched off, the rotation angle of the rotor of the utility model is not more than 180 DEG.

Description

Brake cabable for three-phase alternating current star connetion motor

The utility model relates to a kind of brake, relates in particular to a kind of brake that is applicable to three-phase alternating current star connection motor.

In the prior art, 1., plug braking the braking method of three-phase alternating-current motor has following several:: its principle as shown in Figure 1, the closed motor rotation of K1 is when needs stop, K1 disconnects, the K2 closure, motor stator produces backward-rotating field, makes rotor produce opposing torque and braking, this braking is fairly simple, retro-speed is fast, but energy consumption is bigger, and cost is higher.2., dynamic braking: its principle as shown in Figure 2, the K1 closure, motor operation, K1 disconnects during braking, the K2 closure, alternating current is given motor stator through rectifying tube, produces the stationary magnetic field, and rotor is shut down, its shortcoming is to brake slowlyer, cost is also higher.3., YEJ series braking motor, be the brake motor of new generation that the German model machine of present domestic reference is produced, its electrical equipment principle as shown in Figure 3: D1 is a rectifying tube among the figure, D2 is a continued flow tube, and Z is a restraining coil, and circuit directly is connected on the terminal of motor, Y connection meets AC220V, star-star-delta connection Y-Y-meets AC380V, and after motor was connected, circuit was powered to restraining coil, restraining coil produces magnetic force makes sucker hold the suction sheet, break away from brake block, rotor rotation, motor work.After the outage, magnetic force disappears, and inhales sheet and break away from sucker under the effect of spring, withstands brake block, produces brake torque, and rotor stops operating.But its retro-speed of this structure is slower, generally needs 0.2～0.8 second, and the back rotor that has a power failure also will rotate for 4～20 weeks, can not satisfy the requirement that must stop immediately in some occasion.

The purpose of this utility model is exactly the brake that is applicable to three-phase alternating-current motor that designs at existing weak point in the above-mentioned prior art, this brake retro-speed is fast, less than 0.02 second, good positioning effect, the back rotor anglec of rotation that has a power failure is less than 180 °.

The purpose of this utility model realizes by following measure: this brake is that the three-phase winding L of star connection motor is directly joined with the three-phase bridge rectifier circuit that has restraining coil Z.

In the utility model, the number of turn of restraining coil is preferably 150 circles (is example with 3KW 4 utmost point motors).

The utility model compared with prior art has following advantage: retro-speed is fast, because the time constant of restraining coil is directly proportional with the number of turn, the number of turn is many more, and after the sucker outage, the time of release is long more, and retro-speed is just slow; Otherwise retro-speed is just fast.The braking circuit of YEJ of the prior art series motor is because directly and power supply join (as AC 220V), voltage is about 99V after halfwave rectifier, about 2630 multiturns of the restraining coil number of turn, resistance is 170 Ω, electric current 0.55A, braking time is 0.2～0.8 second, and the utility model acts on voltage on the restraining coil below 10V, and the number of turn of restraining coil only is 150 circles, so braking time was less than 0.02 second, good positioning effect, the back rotor anglec of rotation that has a power failure is no more than 180 °.And manufacturing process is simple, and materials are few, and cost is low.

The drawing of accompanying drawing is described as follows:

Fig. 1 is the circuit theory diagrams of plug braking in the prior art.

Fig. 2 is the circuit theory diagrams of dynamic braking in the prior art.

Fig. 3 is the braking circuit schematic diagram of YEJ type series motor in the prior art.

Fig. 4 is circuit catenation principle figure of the present utility model.

The utility model is done with detailed description below in conjunction with accompanying drawing:

As shown in Figure 4: this brake is with the Y point disconnection of star connection motor three-phase winding L, joins with the three-phase bridge rectifier circuit that has restraining coil Z again, and the number of turn of restraining coil is preferably 150 circles (is example with 3KW 4 utmost point motors).Its principle is: after the motor energising, power supply is through the directly power supply of the restraining coil in being arranged on sucker of full-wave bridge rectifier circuit, and the magnetic force that sucker produces holds brake block, breaks away from fan blade, the motor rotor rotation; Outage back magnetic force disappears, and brake block resets under spring action, withstands the fan blade of rotation, the rotor stall, and braking is finished.

Claims

1, the utility model relates to a kind of brake that is applicable to three-phase alternating current star connection motor, it is characterized in that: the three-phase winding L of star connection motor is directly joined with the three-phase bridge rectifier circuit that has restraining coil Z.

2, the brake that is applicable to three-phase alternating current star connection motor according to claim 1, it is characterized in that: the number of turn of restraining coil is preferably 150 circles.