SU31109A1 - Starting device for electric motors - Google Patents

Description

The proposed device falls into the category of already known devices for starting electric motors used, for example, to drive elevators. These known devices consist of a series of lever switches which serve to alternately turn off the starting resistance sections from the motor circuit and are actuated remotely in one way or another. The switches are actuated through one common to all the switches of a shaft fitted with cams and connected with. a cataract that slows down the rotation of the shaft and thereby creates a time delay between the moments of BI turning off individual sections. The contact levers of the switches are located on the shaft at different angles relative to each other in such a way that when the cam shaft is rotated, the switches come into action and the contacts are not closed simultaneously, but alternately, in the order of start. According to the invention, said lever switches are mounted on a camshaft with the possibility of some rotation next to the corresponding cam 75a

kami and coupled with them through the pins entering the cuts of the cams.

The proposed device is shown in the drawing in two projections.

The fixture consists of a series of lever switches mounted on a marble board, made in the form of bearing holders 7, / ... which are mounted with a possibility of rotation mounted on shaft 2. The holders 7, 7 .. are located adjacent to the cams 4, 4. mounted on the shaft 2. i. The connection between the holders 7, 7 ... and the cams 4, 4 ... is made by means of pins 3, 3 ... or the like fixed in the holder; shx and inlet their ends in a concentric shaft 2 cuts cams. The cams 4, 4 ... are mounted on the shaft 2 at different angles relative to the vertical in such a way that, when open (shown in the drawing), the contact brushes of the holders 7, 7 ... Hcixo ts at different distances from the corresponding fixed contacts 5 , 5 ... Holders loaded with springs 6, 6 ..., which tend to turn the levers 1.1 ... and close the contact brushes with contacts 5, 5 .... are kept in the indicated position by the cams 4, 4 ... Are in this case the stops for pins 3, 3 ...

A two-end lever 7 is fixed on shaft 2, which by its lower end is connected by a lever gear 8, 9, 10 to the core of an electromagnet 7 /, and by an upper end is connected by a hinge link 12 to a conventional air piston J3 piston 14. The latter is equipped with a valve ( not shown in the drawing) to adjust the time delay.

The action of the device is as follows. When the control circuit is closed, the electromagnet // is excited, pulls in its core and turns shaft 2 counterclockwise (Fig. 1). This movement of the core, the transmission of 10, 9, 8, 7 vi of shaft 2 does not occur instantaneously, but, due to the retarding effect of cataract 14, during a certain period of burden. With such a slow turn of the va.a 2, the holders 7, 7 ..., under the action of the springs 6, 6 ..., follow the cams 4, 4 ... following and alternately close their contact brushes with the fixed contacts, 5, 5 ... In this case, the starting resistance sections / 5 are switched off alternately from the motor circuit (Fig. 2), respectively, in the order of starting. Since the cuts in the cams 4, 4 ... are made elongated, stopping any of the holders 1, 1 ... in the switching position does not prevent the very second rotation of the shaft 2 with the cams and movement of the other holders 7, 1 with the shaft ... not yet reached the switching position. ,

Electromagnet 77 can be made zero; in this case, it remains included in the electric circuit of the engine at all times during engine operation and, in the event of an interruption in the supply of current, releases the transmission 10, 9, 8, 7 and shaft 2. The latter is rotated by the action of spring 16 (Fig. 1) hour (arrowhead, carrying the holders 7, 1 ...) At the same time, the switches are switched to the open position instantaneously, as the cataract valve 14 when the piston 13 is in reverse motion opens and freely passes air into the cataract cylinder.

On the same board on which the switches 7, 7 ... are located, other devices for controlling the engine can be mounted, such as switches for reversing the engine, interlocking contacts included in the control circuit, etc.

The subject matter of the invention.

Claims (2)

1. Starting device for electric motors, mainly for driving lifts, consisting of a series of interlocking springs of lever switches that are used to turn on and off the starting resistance sections, which switches are controlled from remotely controlled and connected to a slow start. a cataract of a camshaft, the sector cams of which interact with the said lever switches and are located at different angles relative to each other in order to alternately Switching on and off these lever switches, characterized in that the lever switches, made in the form of carrier-type contact brushes of holders 7, 7 ..., are mounted, with a possibility of some rotation, on said camshaft 2 in a row with corresponding cams 4, 4 ... and interlocked with the latter reinforced 1} on the brush holders 7, 7 ... pins 3, 3 ..., which enter the concentric shaft cuts of the cams so that in the open position the contact brushes of different switches are located at different distances no x from with corresponding fixed contacts 5, 5 ... and so that, when the cam shaft rotates and all the brush holders 7, 1 .., f rotate under the action of the above springs b, 6 .. y. contacts 5, 5 ..., the closure of brushes with contacts 5, 5 ... did not occur simultaneously, but alternately, respectively, in the order of start. 2. When adjusting according to claim 1, applying a zero electromagnet 77, which serves to drive the camshaft through a lever transmission. fng one. N-