JPH03139144A - Wheel motor device - Google Patents

Abstract

PURPOSE:To reduce mechanical loss by moving a suspension base by a tire for forming a driver mounted on the outer periphery of an annular rotor housing of a motor body. CONSTITUTION:A stator core 5 is formed on its outer periphery with a plurality of stator salient poles 11, and coils 6 are wound on the periphery of the base of the poles 11. A motor 3 is powered by supplying the coils 6 with pulsating current from a power source to a motor body 3, and rotary torque is applied to a rotor core 10 by switching the conductive phases to rotate it. A rotor housing 9 and a tire 14 secured to the housing are rotatably driven by the rotation of the core 10 to move a suspension base 1.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a drive device for a transport vehicle, an electric vehicle, etc., which uses a motor as a driving force.

(Prior Art) Conventionally, as a driving device for a transport vehicle or an electric vehicle using a motor as a driving force, a device that combines a motor and a speed reducer has generally been used.

In general, motors have the characteristics of high speed rotation and low output torque, so they are always equipped with a speed reducer in applications such as transportation vehicles or electric vehicles that require high torque. A speed detector was also essential to control the speed.

(Problems to be Solved by the Invention) A reduction gear and a speed detector are essential in a conventional drive device, but when a reduction gear is used, mechanical loss is unavoidable. Particularly in the case of battery drive, mechanical loss cannot be ignored, which is undesirable from the viewpoint of energy conservation. Furthermore, since the speed detector is a precision component, it has the disadvantage that its reliability is significantly reduced under the environment in which the drive device is used. Furthermore, by providing a speed reducer and a speed detector, it is inevitable that the entire drive device becomes larger.

An object of the present invention is to provide a wheel motor device that eliminates the drawbacks of the above-mentioned conventional devices.

(Means for Solving the Problems) According to the present invention, there is provided a stator housing having a circular outer circumferential surface, a stator core fixed on the circular outer circumferential surface of the stator housing, and a stator core wound around the stator core. an annular rotor housing rotatably provided on the circular outer circumferential surface of the stator housing via a bearing; and an inner periphery of the annular rotor housing. The above drawbacks can be overcome by a wheel motor device characterized by having an annular rotor core fixed to a surface and facing the stator core with a predetermined gap, and a tire fixed to the outer peripheral surface of the annular rotor housing. It is resolved.

(Example) Hereinafter, an example in which the wheel motor device of the present invention is applied to a conveyance device will be described in detail with reference to the drawings.

FIG. 1(a) is a partially cutaway side view showing a wheel motor device of the present invention mounted on a conveying device, and FIG. 1(b) is a side view showing a wheel motor device of the present invention also mounted on a conveying device. FIG. 3 is a partially cutaway front view. A wheel motor main body 3 is fixed by bolts 2 to a suspension base 1 constituting the transport device main body. The wheel motor main body 3 includes a stator housing 4 having a circular outer circumferential surface, a stator core 5 fixed on the circular outer circumferential surface of the stator housing 4, and a stator core 5 wound around the stator core 5 in the direction of the outer circumferential surface. a coil 6 which is excited at different phases in a plurality of parts thereof; an annular rotor housing 9 rotatably provided on the circular outer peripheral surface of the stator housing 4 via a bearing 7; It is configured with an annular rotor core 1o fixed to the inner peripheral surface and facing the stator core 5 with a predetermined gap. The stator core 5 has its outer peripheral surface formed by a plurality of stator salient poles 11, and the coil 6 is wound around the bases of these stator salient poles 11. Furthermore, small stator teeth 12 and small rotor teeth 13 are formed on the outer circumferential surface of these stator salient poles 11 and on the inner circumferential surface of the rotor core 1o to face each other.

This motor body 3 constitutes an outer rotor type step motor. This outer rotor type step motor may be of the generally known variable reluctance type, permanent magnet type, or a hybrid type that is a combination of these types. However, since this motor is required to rotate at low speed and output high torque, for example, Japanese Patent Application No. 1-90557 filed by the present applicant;
The motor described in Japanese Patent Application No. 1-107860 and Japanese Patent Application No. 1-107861 can be effectively applied. Motor body 3 like this
A tire 14 constituting a drive device is fixed to the outer peripheral surface of the annular rotor housing 9.

A power source (not shown) in the motor body 3 supplies a pulse current to each of the plurality of coils 6 wound around the stator salient poles 11, and by switching the energization phase, rotational torque is applied to the rotor core 1o to rotate it. let The rotation of the rotor core 1o rotationally drives the rotor housing 9 and the tires 14 fixed thereto. This causes the suspension base 1 to move.

(Effects of the Invention) The drive device of the present invention described above directly connects the tires to the motor without using a speed reducer, so it is particularly suitable for battery drive from the viewpoint of energy saving with little mechanical loss. Furthermore, since a step motor is used, highly accurate speed detection is possible without a speed detector, and reliability is improved since a speed detector is not required. Furthermore, since a reduction gear and a speed detector are not required, there is an advantage that the entire drive device can be made compact.

below string date

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an embodiment of the wheel motor of the present invention, and FIG. ) is a partially cutaway front view showing the wheel motor device of the present invention also mounted on the conveyance device. 1... Suspension base, 2... Mounting bolts, 3... Motor body, 4... Stator housing, 5... Stator core, 6... Coil, 7.8... Bearing , 9・
... Rotor housing, 10... Rotor core, 11.
... Stator salient poles, 12 ... Stator small teeth, 13 ...
・Rotor small teeth, 〕4... Tire. Figure 1

Claims (1)

[Claims] A stator housing having a circular outer circumferential surface, a stator core fixed on the circular outer circumferential surface of the stator housing, and a stator core wound around the stator core that is excited at different phases in a plurality of portions in the direction of the outer circumferential surface. a coil, an annular rotor housing rotatably provided on the circular outer circumferential surface of the stator housing via a bearing, and fixed to the inner circumferential surface of the annular rotor housing and facing the stator core with a predetermined gap. A wheel motor device comprising an annular rotor core and a tire fixed to an outer peripheral surface of the annular rotor housing.