SU875546A1 - Two-rotor induction electric motor - Google Patents

Description

one

The invention relates to electrical machines and can be used to drive various operating mechanisms.

Asynchronous electric motors are known, consisting of a stator with rf windings and concentric arrangements of hollow working and ferromagnetic auxiliary rotors, which are not mechanically coupled and can rotate at different frequencies. The auxiliary rotor is an internal collar for closing the magnetic flux and serves simultaneously to cool the electric motor 1..

A disadvantage of the known two-rotor asynchronous electric motors is that the efficiency from using the auxiliary rotor is low.

The closest to the invention by technical essence and achieved: my result is an engine in which the auxiliary rotor-: is an internal hub and has axial inclined ventilation channels. The hollow rotor is mounted on the hub, and its shaft is located inside the cylinder, on which the magnetic core is placed in the rotor, carrying the ventilation blades. While rotating

the auxiliary rotor is ventilated by the motor according to the principle of a centrifugal fan 21

A disadvantage of the known engine is that it has an insignificant starting torque and overload capacity, which limits its use.

ten

The purpose of the invention is to expand the field of application of an electric motor by increasing its starting torque and overload capacity.

The goal is achieved for

15 due to the fact that the hollow rotor is mounted for movement along a shaft on which a pin is mounted, the free end of which is placed in a V-shaped groove made in the hub of the working rotor. On the inside of the hollow rotor there is a stopper element connected to the hub of the hollow rotor by an elastic element, and on the end surfaces of the rotors are mounted

25 friction discs.

The drawing shows a General view of the electric motor in section.

Claims (2)

A stator 1 with windings 2 is pressed into. body 3. The hollow rotor 4 is made integral with the hub 5 and has the shape of a glass, at the bottom of which are ventilation windows 6, and on the inner end surface there is a friction disk 7 All 8 of the hollow rotor mounted in bearing shields 9 and 10 on bearings 11 and 12. The auxiliary magnetic conductor monoblock rotor 13 is mounted on the hollow cylindrical part of the bearing shield 10 on bearings 14 and 15. On the end surfaces of the auxiliary rotor 13 there are attached a centrifugal screw 16 and a friction disk 17 having ventilation These holes 18. The rim 19 of the disk 17 and the rim 20 of the centrifugal fan 16 are made of a material with a low electrical resistivity; in the hub 5 of the working rotor 4 there are V-shaped grooves 21, on both sides. and a pin 22 rigidly fixed on the shaft 8, positioned with the possibility of movement along V-shaped grooves 21, and a stop 23 connected rigidly by a spring 24 with the working rotor 4. The hub 5 of the working rotor 4 is reinforced with the sleeve 25, and the auxiliary rotor 13 is fixed by means of a spring washer 26 and a self-locking elastic nut 27. In the bearing shield 9 and in the housing 3. ventilation windows 28 and 29 are made. The electric motor works as follows. When voltage is applied to the windings 2 of the stator 1 and the working rotor 4 and the auxiliary rotor 13, electromagnetic forces start to act, trying to bring them into rotation. Moreover, if the resistance moment on the shaft 8 is greater than a certain value, the spring 24 is set, the spring 24 is displaced in the axial-radial direction relative to the pin 22 along one of the edges of the V-shaped groove 21, depending on the direction of rotation. The coupling will come into contact, and the total torque of both rotors 4 and 13 will act on the shaft 8. When the torque decreases. The laziness on the shaft 8 is lower than the spring force 24, the last rotor from the contact disk 17, and both rotors 4 and 13 will rotate unaffected. The compression force of the spring 24 is chosen not more than the force of the working rotor 4. The centrifugal fan 16 during the rotation of the rotor 13 provides intensive cooling of all heating parts. The advantage of the proposed electric motor is an increase in the starting torque and overload capacity due to the use of the electromagnetic torque of the auxiliary rotor. This allows the construction to be used to disperse mechanisms with large flywheel masses. The axial force of pressing the rotors is controlled by the spring stiffness and the angle of inclination of the sides of the V-groove. V-shaped grooves in the hub of the working rotor provides work-. the ability of the electric motor in reverse mode of operation. In this case, the braking moments on the shaft, at which the auxiliary rotor is connected, can generally be made different for different directions of rotation due to different angles of inclination of the sides of the V-shaped groove. Since the rims of the contact disk and the centrifugal fan are made of material with a high electrical resistivity, they perform the functions of end rings for the auxiliary ferromagnetic monoblock rotor. Claims An asynchronous two-rotor electric motor comprising a regulator with windings and a hollow rotor mounted on a shaft on its shaft with a hub inside which a magnetically mounted rotor with ventilation blades is installed on the hollow cylinder that surrounds the shaft. the field of application, the hollow rotor is mounted for movement along the top, on which is attached a pin located in a V-shaped groove in the hub with an axis of symmetry, parallel to the axis of the shaft, on the last mouth Credited stop member associated with the hub elastic member and on the adjacent surfaces of end ra1emescheny rotor friction discs. Sources of information taken into account in the examination 1. Japanese Patent 53-17724, cl. 55A, 1978. 2. The patent of the GDR 18393, 21 d, 51/01, 1960. 27G5 J3 if J V / 5 29 4.