JPH06335201A - Rotor structure for outer-rotor motor - Google Patents

Abstract

PURPOSE:To prevent a temperature rise of a bearing by forming a plurality of blades axially spirally connected and protruding externally on an outer periphery of a connecting part of a rotary shaft of a rotor, and a plurality of openings at a base. CONSTITUTION:A plurality of blades 14 are protruding from an outer periphery of a connecting part 11 of a rotary shaft to extend axially spirally reversely to rotation of a motor to reach a sidewall of a rotor 4, and a plurality of openings 15 are formed to match positions of the blades 14 at the sidewall of the rotor 4. When the motor is driven to rotate the rotor 4, an air flow introduced through a vent hole 16 of a bearing bracket 7 is accelerated by the blades 14 of the part 11, fed to a motor cover side via the openings 15 of the sidewall of the rotor 4, and discharged through the hole 16 formed at a bearing 13 of the cover 12. As a result, a flow of the air inside a stator core is accelerated to expedite heat dissipation of a stator core to suppress a temperature rise of a stator winding and the bearing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotor structure for an outer rotor electric motor.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 3, in an outer rotor motor, a stator core around which a stator winding is wound and a wiring board for drawing out the stator winding are integrally molded with a thermosetting resin to form a stator. The bearing bracket, in which the bearing bearing is fitted to one side of the iron core, is press-fitted and fixed.
A motor in which the ring-shaped rotor shown in Figure 4 is inserted through the rotating shaft to cover the outer circumference of the integrally formed stator iron core, which is fitted into the bearing bearing of the bearing bracket to support the shaft, and the bearing bearing is press-fitted and fixed in the center. The cover rotatably supports the other end of the rotary shaft, covers the stator core integrally formed with the rotor, and press-fits and fixes it to the base of the stator core to form the outer shell of the electric motor. In this state, the stator winding wound around the stator core is covered with thermosetting resin, and the outer circumference is covered with the rotor and the motor cover.
The heat generated in the stator windings is only cooled by the airflow flowing through the ventilation holes of the bearing bracket, and the heat radiation is not sufficient, and the temperature rise of the bearing bearing fixed to the bearing bracket cannot be avoided.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and promotes heat dissipation from the stator winding by increasing the flow of air flowing inside the stator core. At the same time, the purpose of the bearing is to prevent the temperature rise of the bearing.

[0004]

In order to achieve the above-mentioned object, a plurality of blades axially connected to the outer circumference of a rotary shaft joint of a rotor and protruding outward, and a plurality of blades of the rotary shaft joint are provided. A plurality of openings were formed in the base.

[0005]

According to the above construction, an opening is formed at the base of the rotary shaft joint formed in the center of the rotor, and a plurality of blades are formed on the outer periphery of the rotary shaft joint in the axial spiral direction. By press-fitting and fixing to the rotating shaft, the rotation of the rotor accelerates the air flow through the ventilation holes of the bearing bracket with multiple blades, and discharges it through the openings to increase the air volume and accelerate the heat dissipation of the stator windings. , Bearing The temperature rise of the bearing can be reduced.

[0006]

Embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a side sectional view showing a configuration of an outer rotor motor of the present invention, in which a wiring board 3 for drawing out the stator winding 1 is closely attached to one side of a stator core 2 around which the stator winding 1 is wound. Except for the inner side of the stator core 2 and the outer side facing the rotor 4, the outer periphery of the stator core 2 is integrally molded with an electrically insulating thermosetting resin 5, and a bearing bearing 6 is held in the center of the side surface on the side opposite to the rotor. A step recess 8 for press-fitting and fixing the bearing bracket 7 is formed. On the other hand, a bottomed cylindrical rotor 4 integrally holding a ring-shaped rotor core 9 facing the outer side of the stator core 2 and a rotary shaft joint for press-fitting and holding the rotary shaft 10 inwardly in the center thereof Part 11 is provided, the rotary shaft 10 is inserted into the stator core 2 with the rotary shaft 10 being press-fitted into the rotary shaft joint 11, and one end of the rotary shaft 10 is fitted into the bearing bearing 8 of the bearing bracket 7. The rotor 4 and the other end is fitted into the bearing bearing 6 press-fitted and fixed to the bearing portion 13 of the motor cover 12, and the motor cover 12 is joined to the outside of the integrally formed stator core 2. Is rotatably supported on the outside of the stator core 2 to form an outer rotor motor.

FIG. 2 is a cross-sectional perspective view showing the details of the rotary shaft joint portion of the rotor. A plurality of vanes 14 protruding outward are formed on the outer periphery of the rotary shaft joint portion 11, and are spirally formed in the axial direction. Further, it extends in the direction opposite to the rotation of the electric motor and reaches the side wall of the rotor 4, and a plurality of openings 15 are formed in the side wall of the rotor 4 according to the positions of the blades 14. In this state, when the outer rotor motor is driven and the rotor 4 rotates, the airflow flowing through the ventilation hole 16 of the bearing bracket 7 is accelerated by the blades 14 of the rotary shaft joint 11 as shown by the arrow in FIG. It is delivered to the motor cover side through the opening 15 in the side wall of the rotor 4, and is discharged through the vent hole 16 provided in the bearing portion 13 of the motor cover 12. In this way, by accelerating the flow of the air flowing inside the stator core 2 to promote the heat dissipation of the stator winding 1, the temperature rise of the stator winding 1 is suppressed to a low level, and the bearing bearing 8 The temperature rise can be reduced.

[0008]

As described above, according to the present invention, a plurality of blades projecting outward at the rotary shaft joint of the rotor and extending in the axial spiral direction, and a plurality of openings at the base of the shaft joint of the rotor side wall are provided. It is possible to accelerate the air flow inside the stator core by operating the electric motor to accelerate the heat radiation of the stator winding, and keep the temperature rise of the stator winding and the bearing bearing low. You can

[Brief description of drawings]

FIG. 1 is a side sectional view showing a configuration of an outer rotor electric motor of the present invention.

FIG. 2 is a cross-sectional perspective view of essential parts showing details of a rotary shaft joining portion of the rotor of the present invention.

FIG. 3 is a side sectional view showing a configuration of a conventional outer rotor motor.

FIG. 4 is a cross-sectional perspective view of an essential part showing details of a rotary shaft joining portion of a conventional rotor.

[Explanation of symbols]

 1 Stator winding 2 Stator core 3 Wiring board 4 Rotor 5 Thermosetting resin 6 Bearing bearing 7 Bearing bracket 8 Step recess 9 Rotor core 10 Rotor shaft 11 Rotor shaft joint 12 Motor cover 13 Bearing part 14 Blade 15 Opening 16 vents

Front Page Continuation (72) Inventor Koji Mori 1116 Suenaga, Takatsu-ku, Kawasaki City Inside Fujitsu General Limited

Claims (1)

[Claims] 1. A stator core around which a stator winding is wound, a wiring board and the like are integrally molded with a thermosetting resin, and a bearing bracket in which a bearing bearing is fitted is press-fitted and fixed to one side of the stator core and a ring-shaped member. The rotary shaft is press-fitted into the bottomed cylindrical rotor consisting of the rotor core and the rotary shaft joint, and the rotary shaft is inserted inside the stator core to form a motor cover that forms the outer shell with the bearing bearing of the bearing bracket. In an outer rotor electric motor that is axially supported by a bearing that is press-fitted and fixed, a plurality of blades that are connected to the outer periphery of the rotary shaft joint of the rotor in a spiral shape in the axial direction and project outward, and a base of the rotary shaft joint. A rotor structure for an outer rotor electric motor, characterized in that a plurality of openings are formed in the rotor.