SU68230A1 - Device for semi-automatic control of a motor car, in particular, a trolley bus - Google Patents

Description

A device for semi-automatic control of a motor car, in particular a trolley bus, driven by a DC compound motor, an increase in the speed of which at the first start stages is achieved by shunting rheostat sections and by weakening the floor of the shunt winding, is well known.

In the proposed device, in order to ensure a start from a stop at the maximum field regardless of the driver’s will and to enable the latter to choose the value of the field during the start-up during the car’s run, an electromagnetic run-down relay with a magnetic W-shaped is used. On the middle rod of this relay, there is a holding winding, included in the control circuit, and measles in the form of a rocker arm, rotated forcibly. A winding is placed on one of the extreme rods, connected in parallel to the motor kory, and on the other - a winding connected in series to the shunt winding circuit, so that when starting the engine from a stop or low speed, the relay is excited by a winding connected in series to the shunt winding the contacts closed the excitation circuit of the coils of the contactors of the maximum field, and at a sufficiently high engine speed, due to the excitation of the winding connected in parallel to the switch, the relay contacts opened and the contact control tori was carried out by the driver.

FIG. 1 shows the electrical circuit of the proposed device; in fig. 2 - table of contactors sequence; in fig. 3 - overrun relay design.

The rundown relay is an electromagnetic relay with a W-type magnetic core and a beam of a beam type.

No. 68230-2 -

The relay has three windings; I connected in parallel with the koryu tgovogo engine; winding W, connected in series to the shunt field winding, and winding Y, fed from the control circuit.

Start with a stop automatic. It is controlled in the usual manner with the help of an acceleration relay and an automatic controller that controls individual contactors.

The contactors are turned on in the order specified in the sequence table. With such a start from a stop at the preparatory position, only the winding W of the overrun relay turns out to be excited, therefore its PB} II PB2 contacts in the circuit of the lifting coils of the contactors Sh1 and Sh2 are closed.

During start-up at the preparatory position, the I winding is also excited, in which the current from the emf flows. the core, as the motor measles rotate, and its schuntov winding is excited.

With a sufficiently high speed of the machine, due to the increase in emf. the core, the thrust force developed by the magnetic flux of the winding I, accumulates more than the thrust force of the winding W, and the overrun relay is activated.

In this case, the contacts PB1 and PB2 are opened, and the inclusion of the contactors W and W2 depends already on the driver. When braking the car, the driver sets the travel controller to the lowest speed position. In this case, the contact of the stroke controller KX1 is closed and the start is made on the field at the maximum current in the shunt winding. With a less severe braking, the driver sets the stroke controller to the second speed position, then the contact of the stroke controller KX is open, the contact of the stroke controller KX2 is closed, and the start occurs even with some weakening of the floor.

Finally, wishing to further accelerate the car, the driver sets the CC to the third (or even higher) speed and starts automatically, but in the third step of weakening the floor, which is chosen so that the braking of the car due to regenerative currents is practically excluded.

Once the overrun relay has been activated, the activated winding V supplied from the control circuit is activated.

The circuit can be constructed in such a way that when the automatic controller L / S arrives at the position specified by the stroke controller, the winding U is de-energized and the overrun relay is restored. Then regenerative braking is carried out when the automatic controller moves backwards in the same way as usual.

Subject invention

A device for semi-automatic control of a motor car, in particular a trolley bus driven by a DC compound motor, increasing the speed of which in the first stages of the start is achieved by shunting the rheostat sections and in subsequent ones weakening the floor of the shunt winding, characterized in that, in order to ensure the start from a stop at the maximum field, regardless of the driver’s will, and allowing the latter to choose the value of the floor during the start-up process during the course of the car, an electromagnet is used A runout relay with an U-shaped magnetic core, on the middle rod of which the holding winding is included, is included in the control circuit, and is strengthened for rotation of the measles in the form of a rocker arm, the winding is turned on one of the extreme rods, connected in parallel to the engine core, and on the other side winding connected in series to the shunt winding circuit, so that when the engine is started from a stop or at low speed, the relay is energized by a winding connected in series to the shunt winding circuit and its contacts close the exciter circuit The coils of the contactors had a maximum floor, and at a sufficiently high engine speed, due to the excitation of the winding connected in parallel with the switch, the relay contacts opened and the contactors were controlled by the driver.

Fig .. 2