JPH02261033A - Motor - Google Patents

Abstract

PURPOSE:To obtain an inexpensive motor without necessitating any bearing retaining part by arranging a bearing in an insulation cover which covers the end face of a stator. CONSTITUTION:An insulating resin 24a is provided with a rotary shaft penetrating port 24 on the lower surface of a stator 20 and one end of a rotary shaft 22 is penetrated through the rotary shaft penetrating port 24 to receive a rotor 21 into the stator 20. An insulation cover 23, formed on the upper surface of the stator 20, is penetrated by the rotary shaft 22 and is fitted. A coil 25, consisting of a main coil 26 and an auxiliary coil 27, is wound around the stator 20 so as to cross the surface of the rotor 21 up-and-down. Further, bearings 25 are fitted through press fitting at the predetermined positions of the rotary shaft 22 so as to be positioned between the rotary shaft 22 and the insulation cover 23 as well as between the rotary shaft 22 and the insulating resin 24a. According to this method, an inexpensive and small-sized motor may be obtained without providing any bearing retaining dedicated part.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an electric motor in which a rotor is housed in a stator consisting of a split core, and a coil is wound around the rotor. .

[Conventional technology]

FIG. 6 is a perspective view showing a conventional electric motor disclosed in, for example, Japanese Unexamined Patent Publication No. 58-33945, and in the figure (1)
is an iron core plate in which a magnetic pole piece (4) consisting of a yoke (2) and a magnetic pole (3) is integrally formed, (5) is a stator in which this iron core plate is laminated, and (6) is a slot of this stator. A winding wire (not shown) is housed therein. (7) is this slot opening.

A conventional electric motor is configured as described above, and a stator (5) is formed by laminating a plurality of iron core plates (1). The winding is then wound around the magnetic pole piece (4) using the insert method, thereby being housed in the slot (6) and housed together with the rotor (not shown) in the outer casing of the motor (not shown). .

[Problem to be solved by the invention]

In the conventional electric motor as described above, the yoke (2) and the magnetic pole piece (4) are integrally formed, and the magnetic pole (31) is connected to the stator (5).
Since the winding method is an insert type due to the shape protruding inward, the outer circumference of the winding part wound around the magnetic pole piece (4) becomes longer, and the extra wire is drawn outward from both ends of the stator (5). There was a problem that protrusion occurred and post-processing such as molding, varnishing, lacing, etc. was required after winding.

This invention was made to solve the problem,
The purpose of the present invention is to reduce the protrusion of a stator from both ends to the outside, and to obtain an electric motor that requires less post-processing and is easy to assemble.

[Means to solve the problem]

This invention was made to solve the problem,
A stator comprising a yoke portion, a stator ring provided concentrically with the yoke portion, and a plurality of magnetic pole pieces protruding from the stator ring by forming slots, and a stator ring provided within the stator ring. A rotor is fitted to a rotating shaft with a press-fitted bearing, and a coil is wound around a slot so as to go around the rotor in a straight line. An insulating cover is provided which faces the stator and covers the end face of the stator, and the bearing is disposed within this insulating cover.

[Effect]

In this invention, the rotating shaft can be shortened by arranging the bearing inside the insulating cover.

〔Example〕

FIG. 1 is a half-sectional view of an electric motor showing an embodiment of the present invention.
FIG. 2 is an assembled sectional view of the stator, FIG. 3 is a plan view of the stator alone, and FIG. 4 is a plan view of the yoke.
00), (11) are the frame and bracket that form the outer casing of the electric motor (12), (13) are the screws that connect this frame and the bracket, and (14) are the above-mentioned frame α0
), where the outer periphery touches the inner wall of the iron core plate (15).
are laminated, and a plurality of notches (16) are provided on the inner periphery. (17) is a stator ring provided concentrically with this yoke part, (18) is a plurality of magnetic pole pieces that form slots (19) and protrude from this stator ring,
Iron core plates having this shape are laminated to form a stator (20). (21) is a rotor installed inside this stator,
A rotating shaft (2) protruding from the bracket (11) in the center
2) is inserted. (23) is a state in which the rotor is housed in the stator (20), and the rotating shaft (23) is
2), facing the rotor (21), and covering the upper end of the stator (20), for example, the insulating cover is integrally molded of synthetic resin and has a funnel shape.
This serves to separate the coil from the coil and stator ring (17), which will be described later. Reference numeral (24) denotes a rotation shaft through-hole of this insulating cover, which is formed in a rectangular shape and serves to prevent rotation and position the insulating cover (23) during winding of the coil.

(24a) is an insulating resin made of the same shape and material as the insulating cover (23), and is molded and fixed to the lower end surface of the stator (20). , (25) is the above insulation cover (23)
This coil is arranged at the main coil (26) and an auxiliary coil (27). (28) is a bearing, for example, a ball bearing, and is arranged between the insulating cover (23) and the rotating shaft (22), and between the insulating resin (24a) and the rotating shaft (23). .

The electric motor configured as described above is assembled by integrally molding the insulating resin (24a) into the lower surface of the stator (20) by injection molding, for example, into a funnel-like shape having a rotating shaft through hole (24). One end of the rotating shaft (22) is passed through the rotating shaft through hole (24), and the rotor (21) is housed in the stator (20).

Next, an insulating cover (23) formed independently on the upper surface of the stator (20) is fitted through the rotating shaft (22).

Then, the stator is wound around the stator (20) using a flyer type winding machine, for example, so that the coil (25) consisting of the main coil (26) and the auxiliary coil (27) goes around the rotor (21) surface in a straight line. A predetermined number of turns are wound between the slots (19) of (20). A stator (20) around which a coil (25) is wound is press-fitted into a yoke portion (14) through a notch (16), and an insulation (not shown) is provided between the yoke portion (14) and the coil (25). A piece is inserted. Thereafter, a power lead wire (not shown) is connected to the terminal of the coil (25) by solder, and an insulating tube (not shown) is inserted into this connection and fixed with a thread tie. Furthermore, after an insulating face (not shown) is dripped onto the coil (25) and cured by heating, it is added between the rotating shaft (22) and the insulating cover (23) and between the rotating shaft (22) and the insulating resin (24a). A bearing (28) is press-fitted into a predetermined position of the rotating shaft (22) so that the bearing (28) is located at a predetermined position on the rotating shaft (22). Finally, the yoke part (14) having the stator (20) is press-fitted into the frame 00), and after the bracket (11) is attached to the frame αO), it is attached with screws (13). In this way, the bearing (
28) with the insulating cover (23) and insulating resin (24a)
By winding the coil (25) around the stator (20) in a straight line vertically across the surface of the rotor (21), the circumferential length of the coil (25) can be shortened. Coil (2
5) The amount is significantly reduced, and the frame QOI and the bracket (11) do not need to be provided with a bearing holding part, resulting in lower material costs, processing costs, etc. Furthermore, since the bearing (28) enters inside the electric motor (12), the distance between the end faces between the frame 00) and the bracket (11) becomes shorter, and the electric motor (
12) Short overall length, can be made compact.

Further, FIG. 5 shows another embodiment of the present invention, in which the rotor (21
) is provided with four parts (30) at the connecting part of the rotating shaft (22), and an insulating cover (23) and an insulating resin (
A bearing holding part (31) is provided from the rotor (24a), and the rotor (21
) Since the bearing (28) is disposed inside the end face, the overall length of the electric motor (12) can be further reduced and the size of the electric motor (12) can be further reduced.

〔Effect of the invention〕

As explained above, this invention provides a stator comprising a yoke part, a stator ring provided concentrically with the yoke part, and a plurality of magnetic pole pieces protruding from the stator ring by forming slots. and provided within the stator ring,
A rotor that is fitted through a rotating shaft into which a bearing is press-fitted, and a coil that is wound around a slot so as to go around the rotor in a straight line, and that passes through the rotating shaft and faces the rotor, By providing an insulating cover that covers the end face of the stator and arranging the bearing within this insulating cover, it is possible to obtain an inexpensive electric motor that does not require a dedicated bearing holding section.

[Brief explanation of drawings]

FIG. 1 is a half-sectional view of an electric motor showing an embodiment of the present invention.
FIG. 2 is an assembled sectional view of the stator, FIG. 3 is a plan view of the stator alone, FIG. 4 is a plan view of the yoke, and FIG. 5 is a stator showing another embodiment of the present invention. The sectional view and FIG. 6 are perspective views showing a conventional electric motor. In addition, (14) is a yoke part, (17) is a stator ring,
(18) is a magnetic pole piece, (19) is a slot, (20) is a stator, (21) is a rotor, (22) is a rotating shaft, (23)
The insulating cover (24a) is made of insulating resin, (25) is a coil, and (28) is a bearing.

Claims (1)

[Claims] A stator comprising a yoke portion, a stator ring provided concentrically with the yoke portion, and a plurality of magnetic pole pieces protruding from the stator ring by forming slots, and a stator ring provided within the stator ring. A rotor is fitted to a rotating shaft with a press-fitted bearing, and a coil is wound around a slot so as to go around the rotor in a straight line. An electric motor characterized in that an insulating cover facing the stator and covering an end face of the stator is provided, and the bearing is disposed within the insulating cover.