CN2153173Y - Non-breaking switching of single-winding two-speed motor - Google Patents

Abstract

The utility model discloses a simplex winding double speed three-phase asynchronous motor belonging to a two-speed motor, which comprises the connection of a stator winding with two pole numbers. The three-phase asynchronous motor is characterized in that the utility model has on set of the stator winding. The stator winding is changed from a low speed connection to a high-speed connection at twice (or once) under the condition of power-on. The utility model reduces electric current and power loss when switching and switching time, raises the life and operational reliability of the two-speed motor, saves energy, reduces the maintenance load of the motor, raises the production efficiency of driving equipment, and has obvious effect on the two-speed motor starting in full load frequency such as driving the electromotor of a conveyer in coal mines.

Description

Non-breaking switching of single-winding two-speed motor

Belong to double speed three phase asynchronous motor electric drive technology field.

At present, when double speed three phase asynchronous motor switches to high-speed cruising from the low speed starting, must cut off low-speed power earlier, connect high-speed power again, therefore, disconnect moment in low-speed power, motor torque occurs and is interrupted, under the effect of load resistance square, the very fast decline of motor speed, when high-speed power was connected, motor approached across-the-line starting again, produce very big rush of current and power loss, and the voltage drop that the high speed winding produces in starting causes the reduction of high-speed electric expreess locomotive stall square again and prolongs the starting time, for the two-speed motor of fully loaded Fraquent start, for example drag the two-speed motor of coal conveyer in the colliery, the normal stator winding that therefore causes is overheated even burn.Now domestic also the outage switches to two-speed motor at a high speed from low speed.

The purpose of this utility model is to design novel double speed three phase asynchronous motor and control circuit thereof, realize the two-speed motor automatic switchover of not cutting off the power supply from low speed to high speed, make motor in handoff procedure, still have certain torque and rotating speed, thereby reduce electric current, power loss and switching time when switching.

The utility model is achieved in that novel motor adopts pole changing, cast aluminium cage-type rotor.Motor can also can switch to the high speed long-time running by the low speed starting in long-time running under the low speed.When low speed switches to high speed, under the situation of not cutting off the power supply, with stator winding at twice (or once) be converted to connection at a high speed from the connection of low speed.Motor stator winding has 6 and above terminal, if starting of motor low speed or long-time running under low speed, then press Fig. 1 wiring, A, B, C are the binding post of three-phase ac power supply among the figure, 1 to 9 is the outlet terminal of motor, when utilizing A.C. contactor to make motor when low speed automatically switches to high speed, and the connection of motor outlet terminal, be automatically converted to the connection of Fig. 2 from Fig. 1, be automatically converted to the connection of Fig. 3 again.Letter and the same Fig. 1 of digital meaning among Fig. 2 and Fig. 3.

The main line figure of control motor sees Fig. 4, and 1c to 6c is 6 A.C. contactors among the figure, all the other letter and the same Fig. 1 of digital meaning.If motor start and long-time running under low speed, the main contact closure of contactor 1c, 2c and 3c then, the main contact disconnection of 4c, 5c and 6c.When motor when the continuous TURP of low speed is changed to high speed, disconnect the main contact of 2c and 3c earlier, then the main contact closure of 4c and 5c, the main contact of 1c disconnects then, 6c main contact closure, then the binding post of motor becomes the connection of Fig. 3, and motor enters the high speed long-time running.Motor stator winding switches to connection at a high speed from the connection of low speed, is no more than 0.2 second total time.

The utility model is compared with existing outage switch dual electric motor with speed, and major advantage is to have improved the life-span and the functional reliability of motor, and saves energy reduces motor maintenance load in use, improves the production efficiency of institute's driven equipment.For the double speed three phase asynchronous motor of fully loaded Fraquent start, for example drag the motor of coal conveyer in the colliery, effect is more obvious.

Description of drawings

The winding diagram of starting of Fig. 1 motor low speed and long-time running

Fig. 2 motor automatically switches to winding diagram the high speed processes from low speed

The winding diagram of Fig. 3 motor long-time running under high speed

The main line figure that the continuous TURP of Fig. 4 motor changes

Claims (1)

1, a kind of double speed three phase asynchronous motor, there is the stator winding of two kinds of numbers of poles to connect, it is characterized in that: have only a cover stator winding, under the situation of not cutting off the power supply, with stator winding at twice (or once) from the connection of low speed, be converted to connection at a high speed, motor is if start and long-time running, then contactor 1C under low speed, the main contact closure of 2C and 3C, 4C, the main contact of 5C and 6C disconnects, when motor when the continuous TURP of low speed is changed to high speed, disconnect the main contact of 2C and 3C earlier, follow 4C and 5C main contact closure, the main contact of 1C disconnects then, the main contact closure of 6C, then motor enters the high speed long-time running.

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