JPH0759316A - Motor - Google Patents

Abstract

PURPOSE:To provide a motor with a means that increases an area of a magnetic path and serves also as a water-proof structure. CONSTITUTION:A rotor cup 22 has a shaft 24 at the center, and a magnet 26 is provided on an inner face of the rotor cup 22. The magnetic cup 22 is so provided that the rotor cup 22 covers a stator 12. The stator 12 has an inner shaft 24 that rotates freely. An edge part of the rotor cup 22 is elongated to form a water-proof member 38.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outer rotor type motor in which a rotor is arranged outside a stator to rotate a shaft.

[0002]

2. Description of the Related Art Conventionally, there is an outer rotor type motor shown in FIG.

Reference numeral 12 is a stator, which has a through hole 14 for rotating the shaft in the center thereof. This is a coil 18 wound around the iron core 16 and then covered with a mold resin 20. Then, at the time of this molding, the mounting base 13 is projected from one side of the stator 12.

Reference numeral 22 is a metallic rotor cup arranged so as to cover the stator 12. A shaft 24 is provided at the center of the rotor cup 22. Further, a magnet 26 corresponding to a rotor is provided on the inner peripheral surface of the rotor cup 22. Shaft 2
4 and the inner peripheral surface of the stator 12 are two ball bearings 2
It is rotatably arranged by 8, 30. Further, in order to prevent the shaft 24 from coming off from the ball bearings 28 and 30, inside the ball bearing 28,
A CS stop 32 is provided, and an E stop 34 is provided inside the ball bearing 30.

Reference numeral 36 is a bracket for covering the lower side of the through hole 14 of the stator 12, and this bracket 36
Are press-fitted into the mold resin 20.

When the motor 100 is rotated,
When electricity is conducted to the stator 12, the magnet 26 hitting the rotor is rotated to rotate the rotor cup 22 and the shaft 24.

[0007]

The motor 10 having the above structure.
At 0, since the rotor cup 22 needs to be drawn by pressing, the plate thickness cannot be increased and magnetic saturation may occur. Further, in the case of the motor 100 used for the outdoor unit of the air conditioner, it is necessary to waterproof the fitting portion between the bracket 36 and the stator 12 with rubber, which results in an increase in cost.

Therefore, the present invention increases the magnetic path area,
It is intended to provide a motor having a means which also functions as a waterproof structure.

[0009]

In the motor of the present invention, the shaft is provided in the center of a rotor cup made of metal, and a magnet corresponding to the rotor is provided on the inner peripheral surface of the rotor cup. The rotor cup is disposed so as to cover the rotor cup, the shaft is rotatably disposed inside the stator, and the edge portion of the rotor cup is extended to provide a waterproof piece.

[0010]

[Operation] In the motor of the present invention, the waterproof piece extending the edge portion of the metal rotor cup increases the magnetic path area and also serves as a waterproof structure.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. The same reference numerals are used for the structures described in the prior art.

The difference between the conventional motor 100 and the motor 10 of this embodiment lies in the rotor cup 22 made of metal. That is, as shown in FIG. 1, the waterproof piece 38 extends from the edge of the rotor cup 22. The waterproof piece 38 is once extended outward from the edge portion of the rotor cup 22 and then bent inward to form the rotor cup 2.
The end is located inside the edge of No. 2. The waterproof piece 38 is formed at the same time when the rotor cup 22 is press-formed. Further, a resin or metal waterproof ring 40 is fitted in a position of the stator 12 covered with the mold resin 20 corresponding to the waterproof piece 38. The waterproof ring 40 is fixed to the base of the mounting base 13 extending from one side of the stator 12. Further, the outer peripheral wall of the waterproof ring 40 is formed obliquely, and even if water collects in the waterproof ring 40, it flows toward the base of the mounting base 13 and does not enter the stator 12.

In the motor 10 having the above-mentioned structure, the gap formed between the rotor cup 22 and the stator 12 is shielded by the waterproof piece 38 and the waterproof ring 40, so that water can enter. Absent. Also, the rotor cup 22
Since the axial length of is extended by the amount of the waterproof piece 38,
The magnetic path area of the rotor yoke portion increases, the amount of magnetic flux increases, and the efficiency of the motor 10 improves.

[0014]

As described above, according to the motor of the present invention,
By providing a waterproof piece, water does not enter,
Further, the axial length of the rotor cup is extended by the amount of the waterproof piece, the magnetic path area is increased, the amount of magnetic flux is increased, and the efficiency of the motor is improved.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a motor showing an embodiment of the present invention.

FIG. 2 is a vertical sectional view of a conventional motor.

[Explanation of symbols]

 10 Motor 12 Stator 22 Rotor Cup 24 Shaft 26 Magnet 38 Waterproof Piece 40 Waterproof Ring

Claims (1)

[Claims] 1. An outer rotor type motor in which a rotor is arranged outside a stator to rotate a shaft, the shaft is provided in the center of a rotor cup made of metal, and the inner peripheral surface of the rotor cup is provided with the shaft. A magnet corresponding to a rotor is provided, the rotor cup is arranged so as to cover the stator, the shaft is rotatably arranged inside the stator, and the edge portion of the rotor cup is extended to be waterproof. A motor provided with one piece.