JPH05236611A - Wheel motor type electric automobile - Google Patents

Abstract

PURPOSE:To make it possible to absorb switching noise, produced from power converting means such as an inverter, through power wiring. CONSTITUTION:A power cable between a battery and an amplifier (inverter) is provided with capacitance. A power supply cable 16 comprises two copper plates 34 opposing through a dielectric 38. The copper plate 34 is made wide in order to increase the facing surface and to achieve a predetermined capacitance and a dielectric 38 having high permittivity is employed. Since switching noise produced in the amplifier(inverter) is absorbed through the capacitance of the power supply cable 16, influence of the switching noise on other circuits in an electric automobile is suppressed and a circuit for shielding or a filter for measurement can be eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a wheel motor type electric vehicle in which a motor is provided for each wheel.

[0002]

2. Description of the Related Art Conventionally, electric vehicles having a structure in which a motor is provided for each wheel have been known. Actual Kaisho 58-13
Japanese Patent No. 2725 discloses an electric vehicle having such a configuration.

[0003]

However, in the case of an electric vehicle having such a configuration, for example, due to noise generated by the motor power line, wiring mass, etc., the inverter is a front portion or a rear portion of the vehicle, that is, a wheel. Each is placed near the. Therefore, noise (switching noise) generated by the switching element built in these inverters is induced in the wiring connecting the battery and the rotation adjusting device.

The present invention has been made to solve the above problems, and in particular, switching noise is unlikely to be induced in the wiring from the battery to the power adjusting means such as the rotation adjusting device and the inverter. An object is to provide a wiring structure.

[0005]

In order to achieve such an object, in the wheel motor type electric vehicle of the present invention, the power wiring for supplying DC power from the battery to the power conversion means has a wide shape and a thickness. It is characterized by having a plurality of conductors facing each other at predetermined intervals in the direction and a dielectric material interposed at least between the conductors so as to generate electrostatic capacitance between the conductors.

[0006]

In the present invention, a capacitance is generated on the power wiring due to the structure in which the dielectric is interposed between the plurality of conductors.
Also, since these conductors have a wide shape, heat generation due to high-frequency current due to switching can be reduced,
Moreover, since the cross-sectional area is secured, the current capacity increases. Therefore, in the present invention, the switching noise can be reduced by the capacitance while increasing the current capacitance.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows the configuration of a wheel motor type electric vehicle according to an embodiment of the present invention. As shown in this figure, in this embodiment, a motor 12 is provided for each wheel 10. This motor 12 has a battery 14
It is driven by the AC power supplied from the power cable 16 and the amplifier 18. Amplifier 18
Is configured as an inverter, for example, and converts DC power supplied from the battery 14 via the power cable 16 into AC voltage and supplies the AC voltage to the motor 12. By arranging the amplifier 18 near the motor 12, the wiring to the motor 12 can be shortened.

The output of the motor 12 is the total controller 2
Controlled by 0. The general controller 20 responds to the depression of the accelerator 22 and the brake 24 in response to the amplifier 18
The operation of is controlled by PWM, for example. Further, the operation of the general controller 20 can be operated by the operation panel 26, and the operation status can be monitored by the operation monitor CRT 28.

The battery 14 that supplies DC power to operate each motor 12 is a chargeable / dischargeable battery. That is, when the discharge is advanced by supplying the operating electric power to each of the motors 12, the battery 14 is in a state where it needs to be charged. Therefore, the electric vehicle of this embodiment is equipped with the charger 30. The charger 30 has a connector that can be connected to an external power source, and charges the battery 14 with electric power from this external power source. An abnormal voltage processing circuit 32 detects an abnormal voltage generated in the power cable 16 and performs a predetermined process.

The feature of this embodiment resides in the power cable 16 for connecting each amplifier 18 and the battery 14. FIG. 2 shows a configuration example of the power cable 16.
As shown in this figure, the power cable 16 of this embodiment
Has a configuration in which two copper plates 34 having a plate thickness of about 0.5 to 3 mm are arranged so as to face each other and covered with an insulating resin 36. The copper plates 34 are insulated from each other by a dielectric 38 having a high dielectric constant. As a material of the dielectric 38, for example, a material used for a film capacitor or the like is preferable.

With this structure, the power cable 1
The capacitance between the six conductors increases. That is, since the conductor is the copper plate 34, the facing area between the conductors is increased, and the dielectric constant of the dielectric 38 interposed therebetween is high, so that the electrostatic capacitance is generated on the power cable 16. This capacity is
When the thickness of the dielectric 38 is about 0.1 to 0.3 mm, it is 1 to 30 μF.

Therefore, in this embodiment, the amplifier 18
It is possible to obtain a power supply cable that secures or increases the current capacity while generating the electrostatic capacity capable of removing the switching noise.

FIG. 3 shows the configuration of a wheel motor type electric vehicle according to a second embodiment of the present invention, particularly the power cable 16 thereof. The configuration shown in this figure is a configuration in which a plurality of thin copper wires 40 are arranged in parallel to form one conductor, and a dielectric 38 is interposed between both conductors. Even in this case, the same operation and effect as those of the first embodiment shown in FIG. 2 can be obtained, and since the thin wire 40 is used, the bending workability is improved and the wiring work is facilitated. To do. Further, the current concentration due to the skin effect of the current is reduced even for the high frequency current caused by the switching of the inverter, and the heat generation can be suppressed.

[0015]

As described above, according to the present invention,
The switching noise is absorbed by the structural improvement of the power wiring, and the configuration of the circuit wiring in the electric vehicle becomes simpler. In other words, the need for shielding from switching noise is eliminated, so the power supply voltage measurement circuit and SOC
The circuit of the meter is simplified, and the filter of the measurement circuit input stage can be made simpler. In addition, wiring mistakes in the wiring of each part are reduced as compared with the case where the power wiring is performed with + and-separated wires.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a configuration of a wheel motor type electric vehicle according to an embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of a power cable which is a feature of this embodiment.

FIG. 3 is a diagram showing another example of a power cable.

[Explanation of symbols]

 10 Wheel 12 Motor 14 Battery 16 Power Cable 18 Amplifier 34 Copper Plate 36 Insulating Resin 38 Dielectric 40 Copper Fine Wire

Claims (1)

[Claims] 1. A motor provided for each wheel to drive the corresponding wheel to rotate, a battery mounted at a predetermined position of the vehicle, and DC power supplied from the battery via power wiring to AC power. In a wheel motor type electric vehicle comprising: a power conversion unit provided for each motor to supply to a corresponding motor, the power wiring includes a plurality of conductors having a wide shape and facing each other at predetermined intervals in a thickness direction A wheel motor type electric vehicle, comprising: a dielectric that is interposed at least between the conductors so as to generate a capacitance between the conductors.