JPS6096156A - Induction motor - Google Patents

Abstract

PURPOSE:To effectively cool a winding and bearings by forming a groove on the surface of a stator, and forming a hole which communicates with the groove on a rotor opposed to the stator. CONSTITUTION:When a washing side rotor 11 rotates at washing time, air flows by a cooling fin 20 toward the outer periphery of the rotor 11. In this case, wind air flows along radial grooves 14b formed on the rotor 11 and the stator through a hole 15b formed at the rotor 11 to cool the heated stator core 12 and the entire stator as well as bearings 17, 18 secured to the stator. Air flows through the hole 15a formed at the dehydrating side rotor 9 and the groove 14a of the stator by the rotation of the rotor 9 even at the dehydrating time to cool the stator.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an induction motor used in industry and in the general household.0 Construction of a conventional example and its problems Conventionally, an axial gap induction motor having a pair of rotors The electric motor is
The windings were inserted into the slits in the rotor core and molded with nonflammable thermosetting polyester resin, so the bearing that supported the motor shaft had a structure in which the outer periphery was covered with molded material. Also, the air gap between the rotor and stator was set to less than 1 degree.Due to this structure, heat generated from the windings during motor operation is trapped inside the stator, reducing the lifespan of the bearings, etc. There was a problem in that the performance was significantly reduced.

Purpose of the Invention The present invention solves these conventional problems and provides an induction motor in which the windings, bearings, etc. are cooled to improve the service life, improve the performance of the bearings, and reduce the cost of the windings. It is something.

Structure of the Invention The induction motor of the present invention is an axial gap induction motor in which a pair of rotors facing each other are disposed at both ends of a stator in which a stator core and windings are molded in resin, and a hole is provided near the center of the rotor. The stator iron core on the stator surface facing the rotor is provided with grooves running from the center to the periphery, and when the rotor rotates, air flows from the center to the outer periphery along the grooves provided on the stator surface. It is designed to flow radially.

DESCRIPTION OF EMBODIMENTS An axial gap induction motor in which an embodiment of the present invention is applied to a fully automatic washing machine will be described below.

In FIG. 1, 1 is an outer frame, 2 is a washing/dehydration tank, which has a pulsator 3 for stirring the clothes inside, and a balancer case 4 is attached to the opening. Reference numeral 6 denotes an outer tank, which is suspended and supported by the outer frame 1 by a vibration isolating mechanism 6.

7 is a gear case, which has a reduction mechanism inside. Reference numeral 8 denotes a dehydration shaft to which the washing and dehydration tank 2 is fixed, and the dehydration shaft 8 and the gear case 7 are fixed. 9 is a rotor on the dewatering side, which is integrated with the gear case 7. 10 is a stator;
11 is a washing side rotor. The stator 1o has a winding 13 inserted into a stator core 12, and is molded with thermosetting resin. Rotor 1 facing rotor 9 and stator 1°
1, grooves 14a and 14b are provided radially along the slot portion of the stator core 12. A hole 15a is provided near the center of the dewatering side rotor 9 and the washing side rotor 11.
15b is provided, and the washing side rotor 11 is connected to the washing shaft 1.
It is fixed at 6. A bearing 17 supports the washing shaft 16, and is fixed to the stator 1o. 18 is a bearing that pivotally supports the dewatering shaft 8 in which the dewatering side rotor 9 and the gear case 7 are integrated, 019 fixed to the stator 1o is a cooling fin provided on the dehydrating side rotor 9, and 2o is a washing machine. Side rotor 11
cooling fins installed in the

To explain the operation of the above configuration, when the washing side rotor 11 rotates during washing, air flows toward the outer periphery of the rotor 11 by the cooling fins 2°.

At this time, the radial grooves 14b provided in the rotor 11 and the stator 1o are passed through the holes 15b provided in the rotor 11 on the washing side.
The wind flows along the stator core 12 and the entire stator 10, which generate heat, and the bearings 17 and 18 fixed to the stator 10 are also cooled. In the axial air gap induction motor, the characteristics of the motor vary depending on the air gap between the rotor 11 and the stator core 12, and the characteristics deteriorate as the air gap becomes wider.

Therefore, in the past, the air gap between the rotor and stator was 1
m1a -0.5ffa, but the amount of air passing through this gap is small, and by providing the groove 14b as in this example, the cooling effect can be enhanced without deteriorating the characteristics of the stain mower. It is.

Similarly, during dehydration, due to the rotation of the dehydration side rotor 9, the holes 16a provided in the dehydration side rotor 9, the grooves 1 of the stator 10,
Air flows through 4a and cools the stator 10. Therefore, the stator 10, which is formed by pushing the polyphase winding 13 into grooves provided at both ends of the stator core 12 and molding the stator core 12 and the polyphase winding 13 with synthetic resin, and this stator 1o. A pair of rotors 9 facing opposite ends and having a gap in the axial direction,
11 and a bearing 17 fixed to the center of the stator 10, and the pair of rotors 9 and 11 have holes 16a.

15b, and grooves 14a and 14b are provided radially along the stator core winding grooves on the surface of the stator 1o facing the rotors 9 and 11, so that when the rotors 9 and 11 rotate. ,
Since the wind flows radially from the center to the outer periphery along the grooves 14a and 14b, two windings 13. Bearing 17.
18. Stator 10 can be cooled.

Effects of the Invention As is clear from the above, the induction motor of the present invention can be fixed by providing grooves on the surface of the stator and providing holes communicating with the grooves in the rotor facing the stator. The amount of air flowing between the child and the rotor increases, improving the cooling effect of the stator bearing, improving the life of the bearing, reducing the amount of windings used, and reducing costs.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a fully automatic washing machine using an axial gap type induction motor according to an embodiment of the present invention, Fig. 2 is a sectional view of main parts of the induction motor, and Fig. 3 is a sectional view of the main part of the induction motor. FIG. 3 is a plan view of a stator in the electric motor. 9...Dewatering side rotor, 11...Washing side rotor, 12...Stator core, 14a, 14b
...Groove, 15a, 15b...hole. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
0 4 Figure 2

Claims (1)

[Claims] An induction motor in which a stator is provided with grooves on its surface, and a rotor facing the stator is provided with holes that communicate with the grooves.