JPH05276719A - Electric vehicle drive motor - Google Patents

Abstract

PURPOSE:To constitiute a low-priced and high-performance electric car by using an asynchronous motor wherein two rotors are driven without mechani cally coupled to each other, and arranging the output shaft of the motor at both ends in axial direction. CONSTITUTION:Two cage type induction rotors 3 provided in one stator 2, and they are not mechanically coupled with each other. When an AC is applied to a coil 1, rotational magnetic fields of the same phase are added to the two rotors 3, and while the electric car is traveling straight, the rotors 3 rotate at the same speed. While the electric car is turning, the number of revolutions of the outside tires is high and that of the inside tires is low, and a longer torque is transmitted to the inside tire. At this time, always stable torque is transmitted to both wheels by adding the rotational magnetic field at a speed of the sum of the desired speed of the outside tire and slip speed to a stator 2. moreover, when one tire is not grounded on a bad road, etc., the stability at grounding is secured by controlling the rotation speed of the floating tire into a desired speed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an asynchronous motor such as an induction motor used for driving an electric vehicle.

[0002]

2. Description of the Related Art Since a conventional electric vehicle driving motor has a single shaft, the output of the electric vehicle is distributed to both tires by a differential gear 15 as shown in FIG. The differential gear 15 was indispensable for making a difference in rotation speed between the inner tire and the outer tire during turning of the electric vehicle.

However, the differential gear 15 has a large mechanical loss, and has been a major factor in shortening the travel distance per charge in an electric vehicle in which the amount of energy that can be mounted is limited.

Therefore, the method of FIG. 4 using two motors 22 in order to omit the differential gear is also widely used.

[0005]

However, the conventional method using the two motors 22 has doubled the number of man-hours at the time of manufacturing the motors, which has been a cause of raising the price of the electric vehicle.

The present invention has been made in order to solve such a conventional problem, and an object of the present invention is to provide a motor capable of forming an inexpensive electric vehicle.

[0007]

In order to solve the above problems, the present invention relates to a drive motor for an electric vehicle, wherein the motor is not mechanically coupled within one stator.
An asynchronous motor for driving the individual rotors, and the output shafts of the motors are arranged at both ends in the axial direction.

[0008]

1 is a longitudinal sectional view of an electric vehicle driving motor of the present invention, and FIG. 2 is a plan view of an electric vehicle using the electric vehicle driving motor of the present invention.

Reference numeral 2 denotes a stator, and the coil 1 is wound around the slot of the stator 2. The stator 2 is a motor case 9
Is fixed to the motor case 9, and flanges 8 are provided on both ends of the motor case 9.
Is fixed. Housings for the end bearings 6 and the internal bearings 5 are formed on the flange 8 in order to rotatably support the rotor shaft 7. The basket-type induction rotor 3 is fixed to the rotor shaft supported by the both bearings with the nut 4 to form an induction motor as a whole. There are two cage type induction rotors 3 in one stator 2 and they are not mechanically coupled to each other.

FIG. 2 is a plan view of an electric vehicle using the electric vehicle driving motor of the present invention. The motor-side pulley 12 is fixed to the rotor shaft extending from both ends of the electric vehicle driving motor 20, and power is transmitted to the tire-side pulley 13 via the belt 14. A tire 14 is fixed to the tire pulley 13.

When alternating current is applied to the coil 1, rotating magnetic fields of the same phase are applied to the two rotors 3, respectively.
When the electric vehicle travels straight, both tires rotate at the same speed, so the rotor 3 also rotates at the same speed, and the operation is as if it were one rotor.

When the electric vehicle turns, the left and right tires 11 rotate at a high speed on the outside and a low speed on the inside, so that a large torque is transmitted to the tires on the inside. At this time, it is possible to constantly generate a stable torque on both wheels by applying a rotating magnetic field of a desired speed of the outer tire + slip speed to the stator so that the tire on the high speed side, that is, on the outside of the turning, has a desired speed. .

When one of the tires does not touch the ground due to a bad road or the like, the floating tire becomes a high speed side and continues to rotate at a desired rotation speed, that is, a running speed, and the grounded tire generates a driving force intensively. In a conventional electric vehicle using a differential gear, a floating wheel spins at a speed much higher than a traveling speed and has a serious drawback that the direction of the vehicle is disturbed at the time of re-grounding.However, in the present invention, Since the rotation speed is controlled to be a desired speed, stability is ensured even when touching down.

Further, according to the present invention, since the number of stators occupying a large part of the price of the asynchronous motor is one, the above-mentioned functions can be provided at a low price.

[0015]

INDUSTRIAL APPLICABILITY As described above, the present invention is an asynchronous motor for driving two rotors which are not mechanically coupled in one stator in a motor for driving an electric vehicle. By arranging the shafts at both ends in the axial direction, it is possible to construct a low-cost and high-performance electric vehicle.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a motor for driving an electric vehicle according to the present invention.

FIG. 2 is a plan view of an electric vehicle using the electric vehicle driving motor of the present invention.

FIG. 3 is a plan view of an electric vehicle using a conventional single motor.

FIG. 4 is a plan view of an electric vehicle using two conventional motors.

[Explanation of reference numerals] 1 coil 2 stator 3 basket type induction rotor 4 nut 5 inner bearing 6 end bearing 7 rotor shaft 8 flange 9 motor case 10 electric vehicle chassis 11 tire 12 motor side pulley 13 tire side pulley 14 belt 20 electric vehicle Drive motor

Claims (1)

[Claims] 1. A driving motor for an electric vehicle, which is an asynchronous motor for driving two rotors that are not mechanically coupled in one stator, and the output shafts of the motors are arranged at both axial ends. A motor for driving an electric vehicle.