SU454649A2 - High speed contactless DC motor - Google Patents

Description

one

This invention relates to electric drives.

In the well-known high-speed non-contact direct-current motor according to the main ed. St. No 398001 the four-section winding is connected to the power source by means of two pairs of semiconductor switches, the control circuits of each of which are connected to the outputs of two triggers controlled by the signals of the rotor position sensor installed with an advance angle of 45 el. hail using two sensitive elements, each connected to the same inputs of both triggers by a multichannel reverse relay, two channels of which connect a control circuit of each semiconductor switch of one of the phases to both outputs of their respective trigger.

Such an electric motor provides identical electromechanical characteristics when reversed by installing the sensor at an angle of 45 e. hail and corresponding switching of sensitive elements.

The disadvantage of the electric motor is that the reverse relay has a large number of channels and a significant installed capacity.

In order to reduce the number of channels and the installed power of the reverse relay, one of the sensitive elements of the rotor position sensor is connected with

opposite trigger inputs. This connection of the sensing element to the triggers of the function of the two channels of the relay is performed by one of the triggers.

The drawing shows the connection circuit of the sensing elements of the position sensor to the trigger input circuits using the reverse relay, and also shows the connection of the output trigger circuits to the switch transistor keys. The circuit uses triggers with two stable states.

Four-section motor winding (section 1-4) through transistor switches 5, 6, 7

and 8 is connected to the DC source 9. The control circuits of the transistor switches 5 and 6 are connected respectively to the outputs 10 and II of the trigger 12, and the control circuits of the transistor switches 7 and 8 to the outputs 13 and 14 of the trigger 15. The rotor motor position sensor contains sensitive elements 16 and 17, the output ends of which are connected to channels 18, 19 and 20, 21 of the reverse relay 22. When the position of the contacts of the relay

reverse 22 (see drawing) sensitive element 16 is connected to common point 23 of both inputs of trigger 15 and input 24 of the same trigger, and sensitive element 17 is connected to common point 25 of both inputs of trigger 1

and input 26 of the same trigger.

When reverse, the sensitive elements 16 and 17 are switched. In this case, the sensitive element 16 switches from the input 24 "of the left (or" right) arm of the trigger 15 to the input 26 "of the left (or" right) arm of the trigger 12, and the sensitive element 17 switches from the input 26 of the left (or "right) shoulder of the trigger 12 to the input 27 of the right (or" left) shoulder of the trigger 15, i.e. the sensing element 17 is connected with the opposite inputs of the trigger 12 of the reverse relay through the reverse relay.

Such switching of sensitive elements when reversed provides a change in the sequence of switching winding sections

at 270 el. hail. This allows for the installation of advanced switching at an angle of 45 e. hail for one of the directions of rotation with reverse also provide forward switching with an advance angle of 45 e. hail.

Subject invention

High-speed contactless DC motor for auth. St. L 398001, characterized in that, in order to reduce the number of channels and the installed power of the reverse relay, one of the sensitive elements of the rotor position sensor is connected to the opposite trigger inputs with the aid of the aforementioned relay.