JPH05122898A - Car dynamotor - Google Patents

Abstract

PURPOSE:To promote both of driving torque and generating output with simple construction. CONSTITUTION:A car dynamotor is constituted of a three phase armature winding 2, a converter bridge 4 connected between a battery and the winding end 7 of the armature winding 2 and an invertor bridge 5 connected to the converter bridge 4 in parallel and connected between the battery 3 and a tap 6 of the armature winding 2. Before an engine starts, battery current is converted into AC current by the invertor bridge 5 and is supplied to the armature winding 2. At that time, the armature winding 2 is partially used only, so that increased driving torque is generated. After the engine started, the whole armature winding 2 is used, so that generating current outputted to the battery 3 through the converter bridge 4 from the winding end 7 of the armature winding 2 is increased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicular generator-motor used as an electric motor for starting the engine before starting the engine and used as a generator driven by the engine after starting the engine.

[0002]

2. Description of the Related Art Conventionally, in a vehicular generator-motor, when the number of windings of an armature winding is large, a generator can obtain a sufficient generated current from low-speed rotation, but as a motor, a driving torque is low. On the contrary, if the number of windings of the armature is small, the driving torque of the electric motor becomes high, but as a generator, there is a problem that sufficient power generation output cannot be obtained at low speed rotation and the charging current of the battery becomes insufficient. It was For the purpose of solving this problem, for example, a device for switching the three-phase armature winding to Δ connection before starting the engine, and for switching the three-phase armature winding to Y connection after starting the engine, A device is known in which two sets of armature windings are provided to switch to parallel connection before starting the engine and to switch to series connection after starting the engine.

[0003]

However, the conventional device requires the switching means and the peripheral means in order to improve both the driving torque when used as an electric motor and the power generation output when used as a generator. Therefore, there is a problem that the structure becomes complicated. It is an object of the present invention to provide a vehicular generator-motor, which has a simple structure and improves both driving torque and power generation output.

[0004]

SUMMARY OF THE INVENTION The present invention provides a vehicular generator-motor used as an electric motor for starting the engine before the engine is started, and as a generator driven by the engine after the engine is started, in a multi-phase manner. It is connected between a wound armature winding, a battery mounted on a vehicle, and a winding end of the armature winding, and rectifies a power generation output output from the armature winding and supplies it to the battery. And a converter bridge that is connected in parallel with the converter bridge, and is connected between the battery and the tap position of the armature winding, converts the battery current into an alternating current and supplies the alternating current to the armature winding. Adopted technical means with an inverter bridge.

[0005]

According to the present invention, before starting the engine, the inverter bridge converts the battery current into an alternating current and supplies it to the armature winding. Since the inverter bridge is connected between the battery and the tap position of the armature winding, less armature winding is used and a large driving torque is generated. It is possible to start it. In addition, after the engine is started, the converter bridge is connected between the battery and the winding end of the armature winding, so the number of windings of the armature winding used increases and the large electromotive force is generated from the armature winding. Occurs.
Then, the converter bridge rectifies the power generation output output from the armature winding and supplies it to the battery, so that the battery does not become insufficiently charged.

[0006]

1 and 2 show a vehicle generator motor according to the present invention.
A description will be given based on an example shown in FIG. FIG. 1 is a wiring diagram showing an electric circuit of a vehicular generator-motor. The vehicle generator motor 1 includes an armature winding 2 wound in three phases, a converter bridge 4 that rectifies the AC current output from the armature winding 2 and supplies the battery 3 with the AC current. Inverter bridge 5 for converting to.

The armature winding 2 has eight windings for each phase, the winding start is Y-connected, and a tap 6 is provided between the sixth and second windings. It is connected to the inverter bridge 5, and the winding end 7 is connected to the converter bridge 4. The armature winding 2 includes a rotating shaft (not shown) connected to an engine (not shown) mounted on the vehicle, and a rotor such as a field pole (not shown) fixed to the rotating shaft. By the relative rotational movement, three-phase electromotive force is generated. Further, when the multi-phase alternating current is applied to the armature winding 2, the multi-phase alternating current generates a rotating magnetic field.

The converter bridge 4 is connected to the battery 3+
Connected to the side terminal and connected to the + side rectifier 8 that collects a plurality of diodes and the-side terminal of the battery 3,
It is composed of a minus side rectifier 9 having a plurality of diodes, and rectifies the alternating current generated at the winding end 7 of the armature winding 2 into a direct current.

The inverter bridge 5 is connected in parallel with the converter bridge 4, is composed of a plurality of transistors 10 and a diode 11 for protecting each transistor 10, and is a + side inverter 12 connected to the + side terminal of the battery 3. And a-side inverter 13 connected to the-side terminal of the battery 3. In addition, the inverter bridge 5
Each output terminal of is connected to the tap 6 of the armature winding 2, and converts the battery current into an alternating current to generate the armature winding 2
Supply to.

The operation of the vehicular generator-motor 1 will be briefly described with reference to FIGS. 1 and 2. When a plurality of transistors 10 of the inverter bridge 5 are turned on by a control circuit (not shown) at a predetermined timing when the engine is started, the battery 3 is connected to the armature winding 2 for 6 turns via these transistors 10. A rotating magnetic field is formed by the flow of an electric current. For this reason, a drive torque (see curve 1 in the graph of FIG. 3) larger than the drive torque (see curve 2 in the graph of FIG. 3) when using eight armature windings 2 is generated. Therefore, the vehicular generator-motor 1 can start the engine with a large driving torque.

After starting the engine, the inverter bridge 5
Stop energizing the. Since the rotating shaft is driven to rotate by the engine, an alternating current is generated in the armature winding 2 for eight turns, and the winding end 7 of the three-phase armature winding 2 passes through the converter bridge 4. DC current is supplied to the battery 3 to charge the battery 3. The armature winding 2 for 8 turns at this time has a larger generated current (curve of the graph of FIG. 3) than the generated current (see the curve 3 of the graph of FIG. 3) generated in the armature winding 2 of 6 turns. 4) is obtained.

That is, this vehicle generator-motor 1 does not use special switching means and peripheral means, and when it is operated as an electric motor for starting the engine, it requires a large number of turns (6 turns) and a large current and a large magnetomotive force. It can be operated and the generated current can be increased with a large number of turns (8 turns) when it is used as a generator after the engine is started.

Although the armature winding 2 has three phases in this embodiment, the armature winding may have two phases or four or more phases. In the present embodiment, the tap 6 is provided between the sixth and second turns of the armature winding 2. However, the setting of the number of turns of the armature winding and the way of setting the tap position are selected optimally in design. Needless to say Also, armature windings with different wire diameters may be used on both sides of the tap. In this embodiment, the three-phase armature winding 2 is Y-connected, but the three-phase armature winding 2 may be Δ-connected.

In this embodiment, the transistor 10 of the inverter bridge 5 is shown as a bipolar type.
ET (metal oxide semiconductor field effect transistor), IG
It may be BT (insulated gate type MOS), SIT (static induction transistor), SCR (silicon controlled rectifying element) or the like. In addition, since the reactance of the armature winding 2 drops at the time of power generation at high speed rotation, the transistor 10 also has an effect of sharing the rectified output, and the generated output can be obtained with a small number of windings. It is possible to increase the charging output by using.

[0015]

The vehicular generator-motor of the present invention has a simple structure and can improve both the drive torque when used as an electric motor and the power generation output when used as a generator.

[Brief description of drawings]

FIG. 1 is a wiring diagram showing an electric circuit of a vehicle generator-motor.

FIG. 2 is a graph showing a relationship among an engine rotation speed, a driving torque, and a generated current.

[Explanation of symbols]

 1 Vehicle Generator Motor 2 Armature Winding 3 Battery 4 Converter Bridge 5 Inverter Bridge 6 Tap 7 Winding End

Claims (1)

[Claims] 1. A vehicular generator-motor used as an electric motor for starting the engine before the engine is started, and as a generator driven by the engine after the engine is started, wherein an armature winding wound in multiple phases is used. A converter bridge which is connected between a battery mounted on a vehicle and a winding end of the armature winding and which rectifies a power generation output output from the armature winding to supply the battery to the battery; Connected in parallel with the battery and connected between the battery and the tap position of the armature winding,
An alternator bridge for converting the battery current into an alternating current and supplying the alternating current to the armature winding.