SU36315A1 - Device for controlling the speed of rotation of a high frequency machine - Google Patents

Description

Patent H 12142 proposes a device for controlling the speed of rotation of a high frequency machine, which is driven by a DC motor or an induction motor. The centrifugal regulator is taken as such a regulator. When the motor is supplied with direct current and with a sufficiently constant voltage, the regulator can equalize the fluctuations in the number of revolutions of the engine resulting from a load change.

Likewise, the regulator may allow for equalization of small variations in the DC voltage feeding the motor. In this case, however, the more the deviation of the DC voltage or the load of the machine differs from that on which the regulator is set, the greater the deviation of the regulator from its average position will take place. In the positions near, K to the extreme extreme, move (572)

regulator is not proportional to the change in the number of revolutions. By itself, the regulator can equalize only those changes in speed that do not exceed a very small value.

However, a very precise adjustment with the aid of this regulator can be achieved, if the latter is not allowed to deviate significantly from its average position.

Making the regulator work all the time around the middle position can be made by introducing an additional correction, which could compensate for a significant change in the frequency or voltage of the motor supply current. This additional correction can be made either by introducing additional resistance into the rotor of a three-phase current motor, or by acting on the excitation of a direct current motor, depending on whether.

Date: 01/21/2002

Number of pages: 4

Previous document: SU 36315

Next Document: SU 36317

Class 21 s. 62

№ 86816

PATENT TO INVENTION

DESCRIPTION

devices for automatically controlling the speed of electric motors.

To the patent of an inn-ing company „International Universal Electricity Company

(International General Efectric Company) in New York, USA, according to

April 9, 1931 (for c. Reference. L 79453).

The real inventor of the Institute Alfred Ulner (Alfred Uimer).

A patent was issued on April 30, 1934. The patent is valid for 15 years dated April 30, 1934.

The object of the present invention is a device with a centrifugal interrupter, usually used to control and maintain a constant speed of electric motors, such as, for example, in projection sound film machines operating with two movable contacts mounted on a spring carrying centrifugal weights. , and fixed, reinforced in the case of the chopper. In this closed position of the contacts corresponds to a single speed of rotation of the engine, open-friend. In fact, the spring carrying the moving contact vibrates continuously, and the ratio of the time during which the contacts remain closed, by the time during which they are open, determines the average speed of rotation of the engine, which is thus kept constant. In order to regulate the magnitude of this average constant velocity, as well as to compensate for the wear of the contacts, the fixed contact is made adjustable.

The distance of said fixed contact from moving contact can be varied.

(573)

periods of time during which the contacts are closed and open, i.e. change the value of the average constant speed of rotation of the engine.

The proposed design of such a device has simplicity, cheapness, and reliability of operation.

In addition, in view of the fact that, under production conditions, it is difficult and even impossible to obtain completely identical parts of several manufactured interrupters, which especially concerns the spring carrying the moving contact, but at the same time it is desirable to operate, especially when applied to; sound film devices, identical engine speeds were matched by the same positions of the scale indicator, with which the breaker was equipped, this device design has a device that allows to achieve this without any complication of individual parts or their number.

The structure of the device is shown in the accompanying drawing, where FIG. 1 is a general view, partly in section, and FIG. 2 perspective view of individual parts.

The device is mounted in the housing /, which is fixed to the engine. Shaft

3, the motor passes inside the casing and carries at its end a movable contact, Q mainly consisting of a spring 5, carrying centrifugal weights 6, the contact 7 itself, and a cup 4, reinforced with an insulating gasket 8 and sleeve 3 to the shaft end. A brush 9 slides along the side surface of the contact cup, which connects the moving contact with an external electric circuit. A fixed contact 10 is fixed on a head // rod / 2 with a thread that passes through the disk 13 of the chopper and carries a handle on the thread, made in the form of a wide round nut with a knurling 24 on the side surface and a scale 25 - The disk 13 of the chopper has two concentric p yes holes 14, 14 vi 15, 15, the last of which are threaded inside. The disk 13 is fixed to the case / trgm by screws 16 passing through the holes 14. A adjustable stop 18 is screwed into one of the holes 75. The rod 12 has on itself a prod; 1 cut 20, which includes the protrusion 19 of the disk; thus, the rod 12 with respect to the disk 13 can only move axially. Between the // rod / 2 head and the disk 75 there is a cylindrical spring 2L The knob 23 of the nut is provided with a cut-out 26 giving access to the screws 6 and an internal edge 27, which, abutting the stop J8, limits the rotation of the knob 23 with one turn. The installation of the chopper at a certain rotational speed of the engine is carried out by rotating the handle 23, which causes the rod / 2 to be screwed in or back, which changes the distance between the contacts 7 and W. The installation is controlled using the scale 25 and indices 28 on the side surface and disk / 5. In order to match the same rotational speeds of the engine with the same division of the scale with the springs supporting the moving contact slightly different from each other, the disk / 5 is installed in any position with the help of holes M and screws 76 of the chopper handle, thus compensating for some difference. properties of springs. When assembling the chopper, the moving contact is rotated at a certain determined speed and, at the same time, the rotation of the disk / 3 reaches that the desired (or zero or average) disc scale division corresponds to this speed, after which the latter is fixed in place with screws 16. For this purpose the ability to place the stop / in any of the holes / 5, thereby changing the limits of rotation of the handle 23 with respect to the disk / 5 interrupter. Likewise, contact wear is compensated.

Some details of this design are subject to change, without breaking the essence of the invention; so, for example, instead of a row of holes 14, 14 ... and / 5, 75 ... you can arrange arcuate cuts in the disk and so on.

The subject of the patent.

Claims (2)

1. A device for automatically controlling the rotational speed of electric motors using a centrifugal chopper consisting of a moving contact fixed on a spring carrying weight and a fixed contact fixed to a screwed stem progressively displaced to adjust the distance between both contacts. that in order to achieve a constant alignment of the initial position of the nut moving the screw with the index on the fixed part of the device at a certain position of the Acts of the switch corresponding, for example, to their closure, a disk 13 is used, equipped with concentrically arranged openings 14, 14 ... and 75, 75 ... of which the first are intended to attach the disk to the casing, in a certain necessary position, and the second - for adjustable stop for turning the knob of the nut. 2. The form of the device according to claim 1, characterized in that the disk 13 in The central part of it carries a sleeve provided with a key intended to prevent the screw passing through the sleeve and pressed by the spring 27 from the disk. FIG. 1 firm .. International electricity universal Ai 36816