JPS62163583A - Dc series motor - Google Patents

Abstract

PURPOSE:To obtain a DC series motor capable of switch-controlling exciting current easily, by using overcurrent fusing fuses and relays, by converting a plurality of field coils from parallel to series. CONSTITUTION:When a power source 5 is applied, the circuit current is suddenly increased for the duration T of starting, and by initial exciting current flowing to field coils 1 at the time, starting torque is generated, and a motor starts rotating. When overcurrent fusing fuses 2 are fused by the circuit current after the rotation is started, then a relay coil 6 is driven by a circuit interrupting action due to the fusing of the overcurrent fusing fuses 2, and relay contact points 7 are closed, and a field circuit 3 for all of four field coils 1 converted to be connected in series via the relay contact points 7 is configurated. As a result, initial torque can be quickly shifted to the operating torque of low current.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a DC series-wound motor having a field circuit configuration that easily achieves high-speed rotation.

[Background of the invention]

For example, the rotation control of a conventional DC series motor is
As described in the section on speed control of series-wound motors in "Electrical Equipment Engineering" 10th edition p. 77, connect a resistor in series or parallel to the field coil, or connect a tap on the field coil. This is a method of controlling the excitation current by switching. However, these conventional methods have the problem of requiring complicated control circuits.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a DC series motor that can easily control excitation current switching without requiring a complicated control circuit.

[Summary of the invention]

In the present invention, after the power is turned on to a plurality of field coils connected in parallel via an overcurrent fuse, the initial
The i current ζ thus generates a starting torque, and after the start of one rotation (
When the above-mentioned overcurrent fuse is blown, the circuit is cut off, and all of the above-mentioned field coils are automatically connected in series by a means such as a relay, and the excitation cylinder and current are switched and controlled. , which is a direct current series motor having a field circuit configuration that allows the transition from the initial torque to the operating torque simply and quickly. This will be explained using figures.

FIG. 1 is a connection configuration diagram of a field circuit when an overcurrent fuse is not blown, showing an embodiment of a DC series motor according to the present invention. FIG. 2 is a connection diagram of the field circuit after the overcurrent fuse is blown.

In FIGS. 1 and 2, 1 is a field coil, 2 is an overcurrent fuse, and 3 is a field circuit.

4 is the armature, 5 is the power supply, 6 is the relay coil, 7 is the relay contact, 8 is the resistance, and ■ is the circuit current.0 Figure 6 shows the relationship between the circuit current ■ in Figures 1 and 2 and time. FIG. In the $3 diagram, t is time,
T is the section at the time of starting.

In the DC series motor having a plurality of field coils 1 or an even number of field coils 1, for example four, as shown in FIG. The field circuit 6 is connected to the armature 4 and the power supply 5 in series.

When the power supply 5 is turned on with this connection configuration of the field circuit 3, the circuit current suddenly increases to tlI in the section T at the time of starting after turning on the t4 power in FIG. Starting torque is generated by the initial excitation current and the motor starts rotating.

When the fuse 2 is blown by the overcurrent at point A in Fig. 3 after the fuse 2 is blown by the overcurrent, the relay coil 6 is driven by the circuit breaking action caused by the blown overcurrent fuse 2. The relay contact 7 is closed, and the field th circuit 6 in which all four field coils 1 have been converted into series connections is removed via the relay contact 7 shown in FIG. As a result, the circuit chamber vit, I in FIG. 6 moves from point A to point B, and the initial torque can be quickly shifted to the low current operating torque.

〔Effect of the invention〕

As described above, according to the present invention, zero field coils can be converted from parallel to series using only overcurrent fuses and relays, so rotation control can be performed extremely easily and economically without using complicated control circuits. It is possible to provide a DC series motor that is possible.

[Brief explanation of drawings]

FIG. 1 is a circuit configuration diagram of an embodiment of a DC series motor according to the present invention when an overcurrent fuse is not blown, FIG. 2 is a circuit configuration diagram after the overcurrent fuse is blown, and FIG.
The figure is a characteristic diagram of the circuit current in FIGS. 1 and 2. 1... Field coil 2... Overcurrent fusing fuse... Field circuit 4... Armature 5... Power supply 6... Relay coil 7... Relay contact 8... Resistance Figure 1. Figure 2.

Claims (1)

[Claims] A plurality of field coils are connected in parallel via an overcurrent blowing fuse, and the circuit is cut off by the blowing of the overcurrent blowing fuse when the power is turned on and the plurality of field coils are blown in response to the circuit breaking action. A direct current series motor with a field circuit configuration having means for converting to series connection.