A device for controlling inrush currents loaded induction motors

 

(57) Abstract:

Usage: electrical machines applied, for example, in multisupport sprinkling machines front steps. The inventive device includes a gearbox, two coaxially placed the Cam coupling and the mechanism of inclusion. The gearbox is mounted on the shaft of the motor. One half-coupling mounted on the shaft, and the other is installed on the same shaft with the ability to move. The mechanism of inclusion is made in the form of a retractor relay and the relay of the maximum current. 2 Il.

The invention relates to electric machines and can be used at higher sprinkling machines.

Known safety Cam clutch comprising two coaxially placed and spring-loaded by means of the elastic element one to the other coupling halves, one of which is installed movably in the axial direction, the second in the district (1).

A disadvantage of the known safety clutch design is the complexity.

Closest to the claimed invention to the technical essence and the achieved result is adjustable magnetic clutch, comprising a housing with a non-magnetic pennie in the form of flanges, and pinned on them by non-magnetic walls, permanent magnets, the motor associated with the leading coupling and the mechanism of inclusion, included in the control circuit of the motor (2).

A disadvantage of the known device is the design complexity and high cost, the need for mandatory DC source to enable coupling constant power consumption during operation, weak safety function.

The aim of the invention is the reduction of inrush currents loaded induction motors and simplifying the design.

This goal is achieved by on-off device for regulating the reduction of inrush currents loaded induction motors, with two placed coaxially coupling and the mechanism of inclusion to be included in the power supply circuit of the induction motor, it is further provided with a gear mounted on the motor shaft, the coupling is made jaw, one of which is rigidly mounted on the shaft, the other set with the possibility of axial movement by a lever and spring, and the mechanism of inclusion is made in the form of a retractor ritania. The simplification of the structure is achieved by replacement of the friction clutch Cam and excretion mechanism of inclusion beyond the coupling, in this regard, there is no need to use ring terminals for power retractor relay. A device for controlling inrush currents in the windings of the induction motor protects the motor from prolonged exposure to high currents by disconnecting it from the drive and connect it again when reaching the nominal mode.

The invention is illustrated in the drawing, where Fig. 1 shows the scheme of the device for controlling inrush currents loaded induction motors and schedule, where Fig. 2 given the dependence of the inrush current from the time of induction motor.

The device includes a Cam coupling half 1, is fixed on the output shaft 2 gear 3, the coupling 4, movable in the axial direction and mounted on the shaft 5, the retractor relay 6 connected to the coupling lever 4 7, overcurrent relay 8, included in the supply circuit 9 induction motor 10, spring 11, which by means of lever 7 introduces coupling half 4 in engagement with the coupling 1.

The device works SL is raised (Fig. 2). Overcurrent relay 8 responds to the increased current and gives the command retractor relay 6, which, by means of the lever 7 displays out of engagement with the coupling Cam 1 Cam coupling half 4, the shafts 2 and 5 becomes disconnected and asynchronous motor 10 is unloaded, it gives him the ability to quickly accelerate. The rate of fall of current in the circuit exceeds the rate of fall of current asynchronous motor without control devices reduce inrush currents (Fig. 2), therefore, the windings of the motor 10 does not have time to warm up to the critical temperature. When the current falls to the nominal value (Fig. 2) overcurrent relay 8 gives the command retractor relay 6 and it is disabled. Spring 11 by a lever 7 introduces coupling half 4 in engagement with the coupling 1. Induction motor 10, has reached idle speed, through the reduction gear 3 is rigidly connected with the shaft 5. Kinematic energy stored by the electric motor 10 and the reduction gear 3 is used to overcome the resistance to rotation of the shaft 5 to the fall speed of the motor 10 to the nominal value. When you reach the nominal mode of operation of the motor 10 a device for controlling in-rush current does not consume the electric power is torayca.

The use of the proposed device allows you to:

to reduce the exposure time to the high inrush currents to the windings of the motor;

to consume electricity only when you start;

to work with alternating current;

to increase the service life of the motor and to reduce the cost of maintenance and repair.

A device for controlling inrush currents loaded induction motors, with two placed coaxially coupling and the mechanism of inclusion to be included in the power supply circuit of the induction motor, characterized in that it is provided with a gear mounted on the motor shaft, the coupling is made jaw, one of which is rigidly mounted on the shaft, the other set with the possibility of axial movement by a lever and spring, and the mechanism of inclusion is made in the form of a retractor relay connected to movable in the axial direction of the coupling, and the relay of the maximum current to be included in the food chain.

 

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