SU1387126A2 - Thyratron motor - Google Patents

Abstract

The invention relates to electrical engineering and can be used in fans, hydraulic pumps and devices with a long service life. The aim of the invention is to increase the reliability of operation by duplicating the functions of the rotor position sensor. This goal is achieved by introducing into the valve motor an additional winding of the throttles with sections 49 and 50, Schmitt triggers 37-40, a controlled voltage regulator 36, zener diodes 45-48 and limiting resistors 41-44. As a result, when a certain frequency of the vrash, e-shaft of the electric motor is reached, a constant voltage is applied to the bases of the main transistor switches 1-4 simultaneously with the command from the position sensor from sections 49, 50 of the drossel. In the event of a break in the signal wire of the position sensor or its breakdown, all keys 1–4 will continue to switch the main sections 5–8 of the core winding. 1 hp f-ly, 2 ill. SS

Description

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The invention relates to electrical engineering, in particular, to electric motors with valve switching, can be used in fans, hydraulic pumps and devices with a large resource and is an improvement of the known device according to Aut. St. No. 1228192.

The aim of the invention is to increase the reliability of operation by duplicating the functions of the rotor position sensor.

FIG. 1 shows a diagram of a valve motor; in fig. 2 is a diagram of a valve motor using a rotor position sensor in the "cold backup" mode.

The valve motor contains the main transistor switches 1-4, the main sections 5-8 of the core winding, the choke 9 with sections, the auxiliary sections 12-15 of the core winding, the auxiliary transistor switches 16-19, resistors 20-27, fuses 28-35. In addition, the valve motor further comprises a controlled voltage regulator 36, four Schmitt triggers 37-40, four limiting resistors 41-44 and four zener diodes 45-48, and the choke is provided with an additional winding with sections 49 and 50, the middle terminal which is connected to a common power source bus, and the extreme ones to the input of a controlled voltage regulator 36, the output of which is connected to the power input of each trigger () Schmitt. The output of each Schmitt trigger is connected to the base of the main transistor switch (1-4) controlled from the rotor position sensor. The output of each of these flip-flops is connected via a limiting resistor (41-44) to the collector connection point of the corresponding auxiliary transistor switch and the auxiliary section of the core winding.

Each Zener diode 45-48 is connected by an anode to a common power supply bus, and by a cathode to the input of the corresponding Schmitt trigger 30-40.

The valve motor also contains a current sensor 51, a threshold device 52 and a relay 53, the output of a current sensor 51 connected to an input of a threshold device 52, the output of which is connected to the control input of a relay 53, whose input is connected to the rotor position sensor 54, and the output connected to the bases of the main transistor switches 1-4.

The valve motor operates as follows.

When DC power is supplied to the switch from the source, the currents begin to commute in accordance with the signals from the rotor position sensor 54

0

five

0

five

0

five

0

five

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five

in the main sections 5-8 of the crust winding, which creates an electromagnetic moment that causes the rotor of the engine to rotate. In sections 12–15, the EMF of rotation is induced in the crust winding, and transistor switches 16–19 begin to switch the current in sections 12–15. At the same time, as the rotor rotates, sections 49 and 50 produce an alternating voltage with an amplitude proportional to the rotational frequency that is applied to the controlled voltage regulator 36. In the stabilizer 36, the alternating voltage is rectified, filtered and fed to a comparator device belonging to the stabilizer 36. When the specified frequency of rotation of the electric motor shaft is reached, the voltage at the output of the stabilizer 36 reaches a value sufficient to power the Schmitt triggers. At the inputs of Schmitt triggers 37-40, the voltage of the EMF is limited by resistors 41-44 and zener diodes 45-48. From the outputs of Schmitt triggers 37–40, the voltage is rectangular in shape with a switching zone close to 180 e. hail, respectively, is fed to the inputs of the power transistor switches 1-4 simultaneously with the signals of the rotor position sensor. In the event of a break in the signal wire of the specified sensor or its failure, all the power transistor switches 1–4 continue to switch the main sections 5–8 of the core winding. Motor operability is maintained.

To reduce the power consumed by the rotor position sensor 54 and to increase reliability by disconnecting the sensor 54 and placing it in cold backup mode, the motor circuit shown in FIG. 2

In this case, the electric motor works as follows.

The control voltage of the threshold device 52 is set to a predetermined response level of the current sensor 51. Relay 53 is normally closed. When the motor is turned on, a starting current arises, since the sensor 54 is connected to the bases of the main transistor switches through the opening contacts of the relay 53. As the VD accelerates, the current approaches the nominal. When the motor reaches the rated rotational speed, the threshold device 52 is triggered and opens the contacts of the relay 53. The rotor position sensor 54 is in the idle backup mode. In the event of an increase in the current (higher than nominal), the threshold device 52 connects the rotor position sensor 54.

Thus, the duplication of the rotor position sensor operation by controlling the switch keys with EMF signals allows the electric motor to remain operable if the signal wire is broken or the rotor position sensor fails.

In addition, when reaching the nominal mode of operation, the position sensor can be switched to the "cold backup" mode, which generally improves the reliability of the valve motor.

Claims (2)

1. Valve motor auth. St. No. 1228192, characterized in that, in order to increase reliability by duplicating the functions of the rotor position sensor, a controlled voltage regulator, four Schmitt triggers, four limiting resistors and four zener diodes are added to it, and the choke is equipped with an additional winding, the middle output of which connected to the busbar, its power supply bus, the other two outputs to the input of a controlled voltage regulator, the output of which is connected to the power input of each Schmitt trigger; the output of each Schmitt trigger; ene database corresponding main transistor switch, and each input of the Schmitt trigger is connected via a limiting resistor to the junction of the collector of the corresponding transistor switch and the auxiliary auxiliary sections of the root winding, each zener diode connected by an anode to a common power supply bus, and the cathode to the input of the corresponding Schmitt trigger. 2. An electric motor according to claim 1, characterized in that it includes a current sensor connected to the main winding of the throttle, a threshold unit and a relay, with the output of the current sensor connected to the input of the threshold unit, the output of which is connected to the control unit input relay whose input is connected with the rotor position sensor, and the output is connected to the bases of the main transistor switches.