SU1365326A1 - D.c. electric drive - Google Patents

Description

(21) 4084324 / 24-07

(22) 07.07.86

(46) 07.01.88. Bul № 1

(71) Moscow Institute of Railway Engineers. Riga Polytechnic Institute

them. A.Ya. Pelshe and Riga Carriage Works

(72) V.M.Antyukhin, G.F.Golubev, A.I.Goldshtein, V.Ya.Uzare, V.P.Feoktistov, Y.Yu.Chuverin and A.V.Yapin (53) 621.316.7.7.5 (088.8)

(56) USSR Copyright Certificate No. 961083, cl. H 02 R 1/58, 1982. USSR Copyright Certificate No. 1127062, cl. H 02 R 5/16, 1984.

(54) DC ELECTRIC DRIVE (57) The invention relates to electrical engineering and can be used to control DC motors. The aim of the invention is to increase the starting torque of the electric motor. The device contains a thyristor 5, the cathode of which is connected to the common point of the conclusions of the main winding of the electric motor 1 and the excitation winding 2. The anode of the thyristor 5 is connected to the first plate of the capacitor 6. The second plate of the capacitor 6 is connected to the anode of the thyristor 4. The use of a two-thyristor motor starting circuit makes it possible to use the energy of the capacitor to increase the torque of the motor, t and L.

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

The aim of the invention is to increase the starting torque of an electric motor.

The drawing shows a diagram of the drive.

The DC drive contains a motor 1 with a series winding 2 excitation, a power source 3, two thyristors 4 and 5, a capacitor 6 and a diode 7, the anode of which is connected to the negative terminal of the power source 3 and the first output of the successive winding 2 excitation, and the cathode connected the first plate of the capacitor 6, the anode of the first thyristor 4 is connected to the positive output of the power supply source 3, and the cathode is connected to the first output of the main winding of the electric motor 1. The cathode of the second thyristor 5 is connected to the connection point of the second output oda root and serial windings, and the anode is connected to the first plate of the capacitor 6, the second plate of which is connected to the anode of the first thyristor 4.

The control of the thyristors A and 5 is carried out by the control unit 8. The capacitor 6 is shunted by a resistor 9 of small power.

The drive works as follows.

In the initial state, the thyristors 4 and 5 are turned off. In this case, the voltage on the capacitor 6 is equal to zero, the current in the windings 1 and 2 is zero.

The engine start starts at the moment the control signal is applied to block 8. Block 8 turns on the thyristor 5, starting

The charge of the capacitor 6 is loaded through the thyristor 5 and the winding 2.

The voltage on the capacitor 6 reaches the voltage of the power source 3, after which the current in the circuit of the capacitor 6 stops and the current of the winding 2 continues to flow through the diode 7 and the thyristor 5. Thanks to this current, the motor is pre-excited by magnetizing its main poles.

Then block 8 turns on the thyristor 4. The discharge of capacitor 6 to the main winding of the electric motor 1 begins, due to which it is accelerated on and the torque of the electric motor 1 rapidly increases.

Claims (1)

20 claims A DC motor containing a motor with a series excitation winding, a power source, two thyristors, a capacitor and a diode, the anode of which is connected to the negative terminal of the power supply and the first output of the serial excitation winding, and the cathode is connected to the first capacitor plate, a positive output of the power source, and the cathode is connected to the first output of the main winding, characterized in that, in order to increase the starting torque of the electric motor, the cathode of the second iristora connected to the junction between the second anchor pins and consistent ob5 0 five a coil, and the anode is connected to the first capacitor plate, the second plate of which is connected to the terminal of the first thyristor.