RU2006170C1 - Electric starter drive - Google Patents

Abstract

FIELD: electric starting of diesel engines. SUBSTANCE: electric drive has capacitor 4 connected to battery by means of charging resistor 5 and to common point of armature and field windings of motor 1 via contact 3B. EFFECT: improved initial starting torque that facilitates engine starting under severe conditions. 2 dwg

Description

 The invention relates to electrical engineering and can be used in the system of electric starting of diesel engines on vehicles, for example, on diesel locomotives and diesel trains.

 Known starter electric drive containing a direct current electric motor of series excitation, the shaft of which is connected to the diesel shaft, and the windings are connected to the vehicle’s battery by means of a contactor.

 The disadvantage of this electric drive is associated with a slow increase in magnetic flux when the electric motor is turned on, which is explained by the action of eddy currents. As a result, we have a slow increase in torque and, accordingly, a delay in starting the diesel engine.

 This disadvantage is eliminated in the starter drive containing a mixed excitation motor, the windings of which are connected to the battery according to a special circuit that provides preliminary magnetization of the motor along the shunt winding circuit.

 However, a mixed excitation starter motor is too complex and is rarely used.

 As a prototype, a starter electric drive is used, comprising a series-direct current direct current electric motor, the windings of which are connected to the battery through a contactor, and a capacitor connected to the battery through a current-limiting element, and the current limiting element and a contactor are connected to the same battery terminal.

 The disadvantage of the prototype is associated with a slow increase in starting torque in the electric motor, which is explained by the action of eddy currents.

 The purpose of the invention is to increase the initial starting torque.

 This is achieved due to the fact that there is an additional power contact of the contactor included between the common point of the armature winding and the field winding of the electric motor, on the one hand, and the common point of the capacitor and the current-limiting element, on the other hand.

 Salient features: an additional contactor contact is connected between the capacitor and the common point of the motor windings.

 In FIG. 1 shows a circuit diagram of the proposed electric drive; in FIG. 2 is a diagram of its operation when starting the proposed electric drive; in FIG. 2 is a diagram of its operation when starting a vehicle diesel engine.

 The electric drive (Fig. 1) contains a starter motor 1, the shaft of which is connected to the diesel shaft of the vehicle, and the armature coil Y1 and the field winding OB1 are connected in series to the battery 2 by means of the power contact 3A of the contactor 3. There is a capacitor 4, which is connected through a resistor 5 and the contact block 3B of the contactor 3 are connected to the battery 2, and by means of contact 3B to the common point of the windings Y1-OB1.

 The electric drive operates as follows.

 Suppose that in the initial state, contactor 3 is turned off, its contacts 3A-3B are open, and contact 3B is closed. A slow charge circuit of the capacitor 4 is formed through the resistor 5; the capacitor charges to battery voltage 2.

To start a diesel engine at the time t _o include contactor 3. Thus through the contact 3A winding H1-OV1 connected to battery 2, and through 3B - OB1 winding to the capacitor 4, resulting in a rapid increase _{in the} current I to the excitation coil circuit. Accordingly, with a certain lag, the magnetic flux Φ of the electric motor increases; the increase in flow is much faster than with a normal connection of the engine to the battery. As the capacitor charge is depleted, the current in the motor circuit is maintained by battery 2, and this current I _I increases already after the current pulse t _in . Along with the increase of _{I, I} appear torque to 1.5-1.7 times the torque of the engine in the usual way for the inclusion of pre-magnetizing motor impulse I _{in max.}

 The technical and economic efficiency of the invention is provided by increasing the reliability of starting a diesel engine, especially in difficult conditions, for example, with a depleted battery. (56) Copyright certificate of the USSR N 1617607, cl. H 02 P 5/16, 1989.

Claims (1)

 A STARTER ELECTRIC DRIVE, comprising a series-direct current direct current motor, the windings of which are connected to a battery through a contactor, a capacitor connected to a battery by a current limiting element, and a current limiting element and a contactor connected to one battery terminal, characterized in that an additional power contactor of the contactor is included, included between the common point of the armature winding and the field winding of the electric motor on one side and the common point of ensatora current limiting element and on the other hand.

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