Motor-brake

FIELD: electrical and general mechanical engineering; self-braking motors built around squirrel-cage induction motors.

SUBSTANCE: stator and rotor contacting surfaces of motor-brake built around squirrel-cage induction motor are provided with taper thread; rotor shaft is supported on one end by radial bearing and on other one, by thrust bearing with spacer disk affording cohesion between stator and rotor threaded surfaces during reverse movement of rotor; shaft extension of the latter is splined.

EFFECT: simplified design, enhanced reliability of brake-motor.

1 cl, 2 dwg

 

The invention relates to stoppers and can be used in General mechanical engineering.

Known locking devices as a separate structure that is attached to the motor [1].

The disadvantage of this design is its complexity.

The objective of the invention is to simplify the design and increase the reliability in operation.

This problem is solved by that in a motor-stopper containing an asynchronous motor with squirrel-cage rotor, the contact surface of the stator and rotor are tapered thread, the rotor shaft leans with one hand on the thrust bearing with spacer disc, and on the other side on a roller radial bearing and the output shaft end of the rotor is provided with a spline.

The invention is illustrated by drawings, where figure 1 shows the General construction of the motor-stop figure 2 - node of the thrust bearing.

Motor-stopper, designed on the basis of the asynchronous motor with squirrel-cage rotor has a shaft 1, which is installed on the rotor 2, the thrust bearing 3 with spacer disc 4 and roller radial bearing 5. The bearings 3 and 5 are installed in the housing 6 on which is mounted the stator pack 7. The surface of the rotor 2 and the stator 7 are contacted by the tapered thread 8. Output horse the shaft 1 provided with slots 9. The ring 10 bearing 3 mounted with a gap with respect to the housing 6. The ring 11 of the bearing 3 and spacer washer 4 is installed with a clearance relative to the shaft 1.

The device operates as follows.

When the motor is started and the rotation of the rotor 2 in the direction of taper threads between the surfaces of the rotor 2 and the stator 7 are in untwisted condition. Distance washer 4, the support bearing 3 controls the degree of unwinding of the thread, forming a constant minimum clearance. Distance washer 4 is such that it is guaranteed engages tapered threads 8 during the rotation of the rotor 2 in the direction opposite to the working direction. Due to the presence of the minimum gap, the rotor 2 rotates freely relative to the stator 7. In the case of engine stop and try to turn the shaft 1 and the rotor 2 in the opposite direction the shaft 1 due to the presence of the slot 9 and the implementation of the gaps on the rings 10 and 11 of the thrust bearing 3, is moved, since the tapered threaded surface of the rotor 2 is in contact with the threaded surface of the stator 7. Conical thread 8 is twisted, and the rotor 2 almost instantly now. Due to the fact that operation of the conical thread is fast, i.e. when moving the rotor 2 relative to the stator 7 is not a complete revolution, the longitudinal movement of the shaft 1 with the ring 10 bearing 3 minimal is but does not cause displacement of the working bodies of the bearing 3 relative to each other. Repeated actuation of the motor again rotates the rotor 2 in the direction of. Thread 8 is opened. The rotor 2 is shifted away from the contact screw surfaces and the shaft 1 is moved. Between the rotor 2 and the stator 7 is again installed the working gap, because the ring 10 bearing 3 is returned to its original position and the bearing 3 is again based on the thrust washer 4.

Motor-stopper is a one-piece design, which is installed on the frame as a conventional electric motor and connected to the electricity network as an asynchronous motor with squirrel-cage rotor, combining the functions of the motor and the stopper.

Sources of information

1. Maemowiki. Design of induction motors. Kuibyshev book house, 1970

Motor-stopper, containing asynchronous motor with squirrel-cage rotor mounted on the shaft, and a stator mounted on the housing, wherein the contact surface of the stator and rotor are made with tapered threads, the rotor shaft leans with one hand on the thrust bearing with spacer disc bonding threaded surfaces during reverse motion of the rotor, and with the other hand on the radial bearing, and the output end of the shaft provided with splines.



 

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FIELD: electrical and general mechanical engineering; self-braking motors built around squirrel-cage induction motors.

SUBSTANCE: stator and rotor contacting surfaces of motor-brake built around squirrel-cage induction motor are provided with taper thread; rotor shaft is supported on one end by radial bearing and on other one, by thrust bearing with spacer disk affording cohesion between stator and rotor threaded surfaces during reverse movement of rotor; shaft extension of the latter is splined.

EFFECT: simplified design, enhanced reliability of brake-motor.

1 cl, 2 dwg

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