SU983948A1 - Mihed excitation electric motor starting device - Google Patents

Description

The invention relates to electrical engineering and can be used for electric starting of primary engines of vehicles.

A device is known for starting the primary engine of a vehicle, comprising a mixed-excitation starter-generator, the armature circuit of which is connected to the batteries at the start of starting through the starting resistor and contacts of the contactor, and at the second stage of starting, through relay contacts, a voltage regulator with a resistor measuring divider and contactor and relay control unit £ 1} _ Closest to the invention is a device for starting a mixed-excitation electric motor containing a storage battery, according to connected through the make contact of the first relay and the starting resistor, shunted by the make contact of the second relay, to the motor anchor circuit, a voltage regulator with a measuring body and a relay control unit [2].

The disadvantages of the known devices are the need to disconnect the voltage regulator from the electric motor for the start time and use additional elements (resistors and contacts) to limit the motor speed, which _ reduces their efficiency and increases overall dimensions.

The aim of the invention is to improve overall dimensions.

This goal is achieved by the fact that the opening and second closing contacts of the second relay and an additional resistor are additionally introduced into the device, the input of the voltage regulator through an additional resistor and the second closing contact being connected to the output of the voltage regulator, and the breaking contact is included in the power supply circuit of the measuring body of the voltage regulator 2θ The drawing shows a diagram of the proposed device.

The device contains an electric motor 1 with a winding 2 in series and a winding 3 of parallel excitation, batteries 4 and 5, connected through the closing contact 6 of the relay 7 and the starting resistor 8, shunted by the closing ^- contact 9 of the relay 10, to the armature circuit of the electric motor 1, voltage regulator 11 with measuring body 12 and control unit 13

983946 relay 7 and 107 The input of the voltage regulator 11 through an additional resistor and a second make contact 15. Is connected to the output of the voltage regulator 11, and the make contact 16 is included in the power circuit of the measuring body 5

12. voltage regulator 11.

The control unit 13 is connected via a button 17 to the batteries 4 and 5, which are connected to each other in parallel through the opening contacts * 10 and 18 and 19 and sequentially through the making contact 20. The measuring body 12 of the controller 11 contains resistors 21 and 22.

The start control device 15 of the electric motor operates as follows. ί

When the button 17 is pressed, unit 13 connects the power supply circuit of the relay coil 7! To the batteries 4 and 5. Its 2Q contact b connects the power supply circuit of the motor armature 1 to the batteries 4 and 5 through the starting resistor 8, which ensures the first stage of starting. Due to the fact that? <That the voltage at the armature of the motor 1 is lower than the setpoint of the controller 11, the parallel excitation winding 3 of the motor 1 is connected to the batteries 4 and 5.

After a certain time delay, block 13 connects the power supply circuit of the relay coil 10 to the batteries 4 and 5. When relay 10 is activated, its contacts 9, 18, 19 and 20 switch the batteries A and 5 from parallel connection to serial and connect them to the serial one and connect them to electric motor 1, which ensures the second start-up stage. At the same time, contacts and 16 relays 10 switch the input of regulator 11 from the armature of electric motor 1 to the output of regulator 11 through resistor 14. As a result, the regulator switches to the mode of stabilization of the average voltage value on the parallel 45 winding 3 of excitation of electric motor 1, limiting the current in the aforementioned winding at the required level, which is set by a new measuring divider on resistors 14 and 22.,

After ’starting the electric motor 1, the button 17 opens and disconnects the block 13 from the battery 4;

as well as relays 10 and relay 7 are disconnected, contacts 6,9,18-20 of which are disconnected? they read the armature circuit of the motor 1 from the batteries 4 and 5 and switch them from serial to parallel. Contacts 16 and 15 of relay 10 switch the input of voltage regulator 11 from the parallel field winding 3 to the motor armature 1 through the resistor 21 The voltage at the motor armature 1 decreases to a level determined by the measuring body 12, after which the voltage regulator 11 provides the generator motor 7 1.

Thus, the use of a voltage regulator in the process of starting the electric motor to limit the excitation currents makes it possible to increase the efficiency of the device and reduce its weight and size parameters.

Claims (2)

relay 7 and 10 G The input of voltage regulator 11 is through an additional resistor 14 and the second closing contact 15 is connected to the output of voltage regulator 11, and the break contact 16 is connected to the power supply circuit of the measuring element 12. voltage regulator 11. The control unit 13 is connected via button 17 to batteries 4 and 5, which are interconnected in parallel through disconnecting contacts 18 and 19 and sequentially through closing contact 20. Measuring element 12 of controller 11 contains resistors 21 and 22. Device control motor start works as follows. When button 17 is pressed, unit 13 connects the power supply circuit of the coil of the relay 7 to the batteries 4 and 5. Its contact b connects the power supply circuit of the electric motor 1 to the batteries 4 and 5 through the starting resistor 8, which provides the first start level . Due to the fact that the voltage on the core of the electric motor 1 is below the setpoint of the regulator 11, the parallel winding 3 of the excitation of the electric motor 1 is connected to the batteries 4 and 5. After a certain time delay, the unit 13 connects the power supply circuit of the relay coil 10 to the battery 4 and 5. When the relay 10 is triggered, its contacts 9, 18, 19 and 20 switch the batteries and 5 from a parallel connection to a series TejibHoe and connect them to the electric motor 1, which ensures a second start level. At the same time, contacts 15 and 16 of relay 10 switch regulator 11 input from core motor 1 to output 11 of controller 11 through resistor 14. As a result, controller 11 is switched to the stabilization mode of the average voltage on the parallel winding 3 of motor 1, limiting it to The winding is on the required level, which is set by the new measuring divider on the resistors 14 and 22. After the start of the electric motor 1, the button 17 opens and turns off the unit 13 from the battery 4; and also relays 10 and relays 7 are disconnected, contacts 6, 9, 18-20 of which disconnect the core of the electric motor 1 from the batteries 4 and 5 and switch them from series to parallel. The contacts 16 and 15 of the relay 10 switch the input of the voltage generator 11 from the parallel winding 3 of the excitation to the pole of the electric motor 1 through a resistor 21 The voltage on the core of the electric motor 1 decreases to the level determined by the measuring body 12, after which the regulator 11 voltage provides the generator mode of operation of the motor 1. Thus, the use of a voltage regulator in the process of starting the motor to limit the current, excitation allows to increase the efficiency of the device and reduce its weight and dimensions. The invention is a device for starting a mixed-drive electric motor containing batteries connected to the electric motor's main circuit through the closing contact of the first | relay and the starting resistor shunted by the closing contact of the second relay voltage regulator with the measuring unit and the relay control unit, t is characterized by the fact that, in order to improve the mass-Dimensional indicators, it is additionally introduced with a breaker and a second slamming contact of the second relay and an additional resistor, with the input the voltage regulator through an additional resistor and the second pinning contact is connected to the output of the voltage regulator, and the disconnecting contact is connected to the power supply circuit of the measuring circuit to the voltage regulator. Sources of information taken into account in the examination 1.-Alabin M.I. Launch of aviation, gas turbine engines. M., 1968, p.15. 2. USSR author's certificate No. 415397, cl. F 02 C 7/26, -H 02 Pi / 20 1974.