SU1705996A1 - Reversible electric drive - Google Patents

Abstract

The invention relates to electrical engineering and can be used to control DC motors. The aim of the invention is to expand the range of regulation. The device contains an electric motor, the root winding 1 of which is connected to sources 4 and 5 through bipolar switches 14 and 17. The excitation winding 2 is connected to sources 4 and 5 through a bipolar switch 3. The use of three bipolar switches in this device increases the number of fixed motor speeds in every direction. 1 il.

Description

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This invention relates to electrical engineering and can be used in a direct current drive.

The purpose of the invention is to expand the range of frequency control.

The drawing shows a diagram of the drive.

The reversible electric drive contains a winding 1 core of a direct current electric motor with a winding 2 of independent excitation, the first 3 bipolar switches, the first 4 and second 5 power sources, keys 6 and 7, diodes 8 and 9. The positive terminals of sources 4 and 5 of the power are connected through diodes 8 and 9, respectively, with the first terminal of the excitation winding 2, and the minus leads of sources 4 and 5 through the fixed contacts 10 and 11, respectively, and the moving contact of the first 3 two-pole switch are connected to the second terminal of the winding 2 of the independent excitation no. The keys 6 and 7 are connected between the opposite terminals of the first 4 and second 5 power sources. The fixed contacts 12 and 13 of the second 14 bipolar switch are connected to the positive and negative leads of the first 4 power source, respectively, and the fixed contacts 15 and 16 of the third 17 bipolar switch are connected to the positive and negative leads of the second 5 power source, respectively.

The drive works as follows.

The voltage of the first power source 4 is chosen by the large voltage of the second power source 5, for example, twice. In the general case, the voltage of sources 4 and 5 is selected depending on the required depth of adjustment of the DE rotation speed, and the sum of the voltages of the first 4 and second 5 sources is equal to the nominal voltage for which the electric motor is designed.

When the switches 6 and 7 are in the open position and the movable contact of the first 3 bipolar switch is in the neutral position, the winding 1 of the electric motor and the driving winding 2 are de-energized and the ED rotor does not rotate.

When the key 6 closes, the movable contact of the first 3 bipolar switch with a fixed contact 10, the movable contact of the second 14 bipolar switch with a fixed contact 12 and the movable contact of the third 17 bipolar switch with a fixed contact 15, the voltage of the second 5 power source is applied to the winding 1 of the motor core ( the polarity of the voltage is shown in the drawing without brackets), and to the excitation winding 2 a voltage equal to the sum of the voltages

the first 4 and second 5 power sources. The rotor of the engine comes into rotation with the frequency of al.

When the key 6 and the two-pole switches 14, 17 are maintained and the moving contact of the first 3 two-pole switches with the fixed contact 11 is closed, the voltage of the second source 5 of the same polarity is still applied to the winding 1 ksr.

The excitation winding 2 is also the voltage of the second power supply 5. In this case, the rotor of the electric motor rotates at a frequency OI2.

With the closure of the key 6, rolling

contact of the first 3 bipolar switch with a fixed contact 10. a movable contact of the second 14 bipolar switch with a fixed contact 13 and a movable contact of the third 17

a bipolar switch with a fixed contact 16 to the winding 1 of the core ED is applied the voltage of the first 4 sources of the same polarity, and to the winding 2 of the excitation - the sum of the voltages of the first

4 and second 5 power sources. Rotor

the motor rotates at a frequency of hell.

By keeping the position of the key 6,

bipolar switches 14 and 17 and

closing the moving contact of the first 3

a bipolar switch with a fixed contact 11 to the winding 1 of the ED box, the voltage of the first 4 sources of the same polarity is still not applied to the excitation winding 2 - the voltage of the second 5 power supply. The ED rotor is rotatable with frequency in.

When closing the key b, the movable contact of the first 3 bipolar switch with a fixed contact 10.

the moving contact of the second 14-pin switch with a fixed cone 13 and the moving contact of the third 17 with a fixed contact 15 to the winding 1 of the core ED is applied a sum of voltages

0 first 4 and second 5 power sources. The same voltage is applied to the motor drive winding 2. The frequency of rotation of ED is hell

When saving the position of the key 6.

The 5 bipolar switches 14 and 17 and the closing of the moving contact of the first 3 bipolar switch with a fixed contact 11 to the winding 1 of the ED box still apply the sum of the voltage supplies of the first 4 and second 5 sources, and the voltage of the second 5 power source is applied to the winding 2 of the exciter. The rotor of the electric motor rotates at a frequency of ab.

When the key 6 is opened and the key 7 is closed, the movable contact of the first 3 bipolar switch with a fixed contact 11, the movable contact of the second 14 bipolar switch with a fixed contact 13 and the movable contact of the third 17 bipolar switch with a fixed contact 16 is applied to the winding 1 of the core ED. The second 5 power source (the polarity of the voltage across the ED is shown in parentheses), and to the excitation winding 2 the sum of the voltages of the first 4 and second 5 power sources. Since the current through the winding 1 of the electric motor core changes sign, and in the excitation winding 2 retains its polarity, the ED reverses and rotates in the opposite direction with the frequency аj - Wi. .

When the key 7 and the two-pole switches 14, 17 are maintained and the moving contact of the first 3 two-pole switch with the fixed contact 10 is closed, the voltage of the second 5 source of the same polarity (shown in the sk-sides) is still applied to the winding 1 of the ED core, and To overtake 2 excitations - the voltage of the first 4 power sources. The rotor rotates at a frequency of 0%.

When the key 7 closes, the movable contact of the first 3 bipolar switch with a fixed contact 11, the movable contact of the second 14 bipolar switch with a fixed contact 12 and the movable contact of the third 17 two-g switch with a fixed contact 15, the voltage of the first 4 sources is applied to the winding of the fixed contact 15 (polarity is shown in parentheses), and to the excitation winding 2 - the sum of the voltages of the first 4 and second 5 sources. The ED rotor rotates at a frequency of CoE.

When the key 7 and the two-pole switches 14, 17 are maintained and the moving contact of the first 3 two-pole switch with the fixed contact 10 is closed, the first 4 source of the same polarity (shown in parentheses) is still applied to the winding 1 of the core, and excitation winding 2 is the voltage of the first 4 sources. The rotor begins to rotate at a frequency.

When closing to the bale 7, the first bipolar switch 3 with a fixed contact 11, the movable TABLE of the second 14 bipolar switch with a fixed contact 12 and the movable contact of the third 17 bipolar switch with a fixed contact 16, the sum of the voltages of the first 4 and second 5 is applied to the winding of the fixed contact 16 sources (the polarity is shown in parentheses), and to the excitation winding 2 also the sum of the voltages of sources 4 and 5. The ED rotor rotates at a frequency of pcs. - - but% .

When the key 7 is kept in position, the bipolar switches 14, 17 are closed, and the moving contact of the first 3 bipolar switch with fixed contact 10 is closed, a sum of voltages of sources 4 and 5 is applied to the winding 1 of the main switch 3 (field strength is shown in brackets), and voltage of the first 4 power sources. The rotation frequency is (0: 2.

When selecting the voltage of the first 4 sources equal to the voltage of the second 5 source of fixed values of the rotation frequency, the rotation in both directions will not be six each, as in the case considered, but four, However, the rotational speed in the forward direction will be equal to rotation in the opposite direction.

Formula vi for gain

A reversible electric drive containing a DC motor with an independent excitation winding, a first bipolar switch, a first and a second power source, two switches, two diodes, the same terminals of both power sources being connected via diodes to the first terminal of the excitation winding, and the other terminals of the same source - the power supply is connected via the first bipolar switch with the second terminal of the winding of the independent excitation, each of the two keys is connected between the opposite terminals of the first second and second power sources, characterized in that, in order to expand the range of rotational speed control, the second and third bipolar switches are introduced into it, the fixed contacts of each of which are connected to the opposite terminals of one of the power sources, and the moving contacts of the second and third bipolar switches connected to the winding box.

Claims (1)

Claim Reversible electric drive containing a dc motor with an independent excitation winding, the first bipolar switch, the first and second power sources, two keys, two diodes, one of the same terminals of both power sources being connected via diodes to the first terminal of the excitation winding connected through the first bipolar switch with the second terminal of the winding independent excitation, each of the two keys connected between the opposite terminals of the first and second power sources, characterized in that, in order to expand the speed control range, the second and third bipolar switches are introduced into it, the fixed contacts of each of which are connected to the opposite terminals of one of the power sources, and the moving contacts of the second and third bipolar switches are connected with anchor winding.