JP2016059097A - Stator structure in flat type step motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain greater flatness than in conventional motors by removing each conventional thick lid and forming a molded annular body by resin molding on an annular stator.SOLUTION: In a stator structure in a flat type step motor, an annular stator (1) having each projected magnetic pole (2) wound in a stator coil (4) is covered with a molded annular body (33) formed by insert resin molding, and each lid (11, 9) is fitted into each opening (43, 44) of the molded annular body (33), thereby allowing a rotor (6) to be internally installed to be rotatable. This structure makes it possible to obtain a flat step motor with greater flatness than in conventional motors.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a stator structure in a flat step motor, and more particularly to a novel improvement for obtaining a flat step motor by resin-molding a ring-shaped stator having a terminal pin holding portion having terminal pins integrally.

Conventionally used examples of this type of stator structure include, for example, the configurations of Patent Documents 1 and 2, but the step motor actually manufactured by the present applicant is as shown in FIG. It is.
That is, in FIG. 4, what is denoted by reference numeral 1 is a ring-shaped stator having a plurality of projecting magnetic poles 2 that project inward at a predetermined angular interval, and whose overall shape is an annular shape. A stator winding 4 is wound through a ring-shaped insulating cover 3.

A rotor 6 supported by a rotating shaft 5 is rotatably provided on the inner surface of the annular stator 1, and is provided at both ends of the rotating shaft 5. The first and second bearings 7 and 8 are provided.
The ring-shaped stator 1 is housed in a cup-like rear lid 9 and is fitted in the first bearing hole 10 of the rear lid 9.

The second bearing 8 is fitted into the second bearing hole 12 of the front lid 11, and an attachment screw 14 attached to each attachment hole 13 formed on the peripheral edge of the front lid 11 is fixed to the rear lid 9. The front lid 11 is attached in a state where the annular stator 1 and the rotor 6 are accommodated in the rear lid 9 by being screwed into the screw hole 15 for use.
Each stator winding 4 wound around each projecting magnetic pole 2 of the ring-shaped stator 1 is connected to a connector 21 via a lead wire 20 as a coil end. The connector 21 is connected to a free end via the lead wire 20. As shown in FIG.

Japanese Patent No. 4860546 JP 2013-158110 A

Since the stator structure in the conventional flat step motor is configured as described above, the following problems exist.
That is, in order to hold the ring-shaped stator and configure the exterior of the step motor, a cup-shaped rear cover having a predetermined depth and a front cover attached to the rear cover are required. As a matter of fact, a rear cover having a shape sufficiently thicker than the thickness of the ring-shaped stator must be used, which has been a major obstacle in manufacturing a flat type step motor.
Further, in order to attach the lead wire and the connector, which are coil ends, to the ring-shaped stator, a holding structure for holding the lead wire on the ring-shaped stator is required, which is a great obstacle to flattening.

  The present invention has been made to solve the above-described problems. In particular, the annular stator is formed by resin molding of the annular stator in a state where the terminal pin holding portion is provided on the annular stator. It is an object of the present invention to obtain a step motor that is flatter than before by attaching a front lid and a rear lid to the body.

  A stator structure in a flat step motor according to the present invention includes a ring-shaped stator having a plurality of projecting magnetic poles projecting inward at every predetermined angle, and a ring-shaped insulating cover that is separate or integral with each projecting magnetic pole. A wound stator winding, a terminal pin holding part integrally formed on a part of the annular insulating cover and provided on the outer periphery of the annular stator, and a plurality of terminal pins provided on the terminal pin holding part; The provided ring-shaped stator body is covered with a ring-shaped molded body molded by insert resin molding, and the holding part of the terminal pin holding part and the outer peripheral part of the outer edge of the ring-shaped stator are exposed to the outside from the ring-shaped molded body. A front lid opening and a rear lid opening are formed on the first and second end faces of the annular molded body, and the front lid provided in the front lid opening; and the rear lid for A rear lid provided on the mouth, and the front lid and the rear lid are provided with first and second bearings, and the front lid and the first end surface are flush with each other. The rear lid and the second end surface are formed flush with each other, and the terminal pin holding portion after the insert molding has a first surface and a second surface orthogonal to the axial direction. A surface is formed, the first surface is flush with the first end surface, and the second surface is flush with the second end surface.

Since the stator structure in the flat step motor according to the present invention is configured as described above, the following effects can be obtained.
That is, a ring-shaped stator having a plurality of projecting magnetic poles projecting inward at every predetermined angle, a stator winding wound around each projecting magnetic pole via a separate or integral ring-shaped insulating cover, A ring-shaped stator body comprising a terminal pin holding portion integrally formed on a part of the ring-shaped insulating cover and provided on the outer periphery of the ring-shaped stator, and a plurality of terminal pins provided on the terminal pin holding portion is formed by insert resin molding. The conventional cup is covered with a molded ring-shaped molded body, and the holding part of the terminal pin holding part and the outer peripheral part of the outer edge of the ring-shaped stator are exposed to the outside from the ring-shaped molded body. A holding structure for the rear cover of the mold and the coil end is not required, and a step motor that is significantly flatter than the conventional one can be obtained. In addition, since the annular molded body is integrated with the stator winding, the heat dissipation effect can be enhanced compared to the conventional case.
Moreover, the stator winding of each magnetic pole is molded by the ring-shaped molded body, so that the stator winding is fixed and can contribute to low vibration.
Further, a front lid opening and a rear lid opening are formed on the first and second end surfaces of the ring-shaped molded body, and the front lid provided in the front lid opening and the rear lid opening are provided. Further, the structure can be greatly simplified by comprising the rear lid.
The front lid and the rear lid are provided with first and second bearings, the front lid and the first end surface are formed flush with each other, and the rear lid and the second end surface are flush with each other. As a result, the exterior of the step motor is flush and can contribute greatly to flattening.
Further, the terminal pin holding portion after the insert molding is formed with a first surface and a second surface orthogonal to the axial direction, the first surface is flush with the first end surface, and the second surface Since the second end surface is flush with the second end surface, the outer surface of the terminal pin holding portion is flush with each end surface of the ring-shaped molded body, which can greatly contribute to flattening of the step motor.

It is a disassembled perspective view which shows the stator structure in the flat type step motor by this invention. It is an expanded sectional perspective view which shows the principal part of FIG. It is a disassembled perspective view which shows the ring-shaped stator before shape | molding the ring-shaped molded object of FIG. It is a disassembled perspective view which shows the conventional structure.

  An object of the present invention is to obtain a stator structure in a flat type step motor by resin-molding a ring-shaped stator having terminal pin holding portions having terminal pins integrally.

A preferred embodiment of a stator structure in a flat step motor according to the present invention will be described below with reference to the drawings.
In addition, the same code | symbol is demonstrated to the part which is the same as that of a prior art example, or an equivalent part.
1 and 3, what is denoted by reference numeral 1 is a ring-shaped stator, and a plurality of projecting magnetic poles 2 provided on the ring-shaped stator 1 and projecting inward at predetermined angles, and the projecting magnetic poles 2. A stator winding wound around a separate or integral annular insulating cover 3 and a terminal pin holding portion 30 integrally formed on a part of the annular insulating cover 3 and provided on the outer periphery of the annular stator 1. A ring-shaped stator body 32 is configured by the plurality of terminal pins 31 provided in the terminal pin holding portion 30.

  The ring-shaped stator body 32 is covered as shown in FIG. 1 by a ring-shaped molded body 33 formed by insert resin molding after being positioned in a mold of an injection molding machine (not shown). Of the covered annular stator body 32, the holding part 33 of the terminal pin holding part 30 and the outer peripheral part 34 of the outer edge of the annular stator 1 are exposed to the outside from the annular shaped body 33.

  A plurality of recesses 36 are formed on the outer peripheral surface 35 of the ring-shaped molded body 33, and through holes 38 corresponding to the respective recesses 36 are formed on the outer edge 37 of the ring-shaped stator 1. When attaching 1 to a device (not shown) or the like, an attachment screw (not shown) can be passed through the through-hole 38 and used.

As shown in FIG. 1, the teeth 2 a of the protruding magnetic poles are formed so as to be exposed in the inner holes 40 of the annular molded body 33.
A front lid opening 43 and a rear lid opening 44 are formed in the first and second end faces 41, 42 of the annular molded body 33, and the first and second bearings 7 are formed in the inner hole 40. , 8 at both ends of the rotary shaft 5, and the front lid 11 and the rear lid 9 are fitted into the front lid opening 43 and the rear lid opening 44 in this state.

  The second bearing 8 is fitted into the second bearing hole 46 of the front lid 11, and the first bearing 7 is fitted into the first bearing hole 45 of the rear lid 9, whereby the rotor 6 is By being held rotatably in the ring-shaped stator 1, it is possible to obtain a flat type step motor 50 that is significantly flattened compared to the prior art.

In the flat step motor 50 described above, the first end face 41 and the front lid 11 are formed flush with each other, and the second end face 42 and the rear lid 9 are flush with each other. This contributes to flattening.
In addition, the first surface 51 and the second surface 52 that are orthogonal to the axial direction P are located at the positions of the terminal pin holding portion 30 of the annular shaped body 33 after the insert molding of the terminal pin holding portion 30 of the annular stator 1 described above. The first surface 51 is flush with the first end surface 41, and the second surface 52 is flush with the second end surface 42, thereby contributing to flattening.

  The stator structure in the flat step motor according to the present invention is formed by integrally forming a ring-shaped stator having a conventional stator winding with a ring-shaped molded body, and a pair of lids attached to the ring-shaped molded body, so that it is significantly more than conventional. A flattened step motor can be obtained.

1 ring-shaped stator 2 projecting magnetic pole 2a tooth 3 ring-shaped insulating cover 4 stator winding 5 rotating shaft 6 rotor 7 first bearing 8 second bearing 9 rear lid 11 front lid 30 terminal pin holding portion 31 terminal pin 32 annular stator body 33 holding one Part 34 Peripheral part 35 Peripheral surface 36 Concave portion 37 Outer edge 38 Through hole 40 Inner hole 41 First end surface 42 Second end surface 43 Front cover opening 44 Rear cover opening 45 First bearing hole 46 Second bearing hole 50 Flat step motor 51 First surface 52 Second surface P Axial direction

Claims (4)

A ring-shaped stator (1) having a plurality of projecting magnetic poles (2) projecting inward at every predetermined angle, and each projecting magnetic pole (2) via a separate or integral ring-shaped insulating cover (3) A wound stator winding (4), a terminal pin holding part (30) integrally formed on a part of the annular insulating cover (3) and provided on the outer periphery of the annular stator (1), and the terminal pin A plurality of terminal pins (31) provided in the holding part (30), and a ring-shaped stator body (32) provided with a ring-shaped molded body (33) molded by insert resin molding,
The holding part (33) of the terminal pin holding part (30) and the outer peripheral part (34) of the outer edge of the annular stator (1) are exposed to the outside from the annular molded body (33). A stator structure in a flat type step motor.   A front lid opening (43) and a rear lid opening (44) are formed on the first and second end faces (41, 42) of the ring-shaped molded body (33), and the front lid opening (43) The stator structure for a flat type stepping motor according to claim 1, comprising a front lid (11) provided and a rear lid (9) provided in the rear lid opening (44).   The front lid (11) and the rear lid (9) are provided with first and second bearings (7, 8), and the front lid (11) and the first end surface (41) are formed flush with each other. The stator structure for a flat type stepping motor according to claim 2, wherein the rear cover (9) and the second end face (42) are flush with each other.   The terminal pin holding part (30) after the insert molding is formed with a first surface (51) and a second surface (52) orthogonal to the axial direction (P), and the first surface (51) 4. A flat step motor according to claim 2, wherein said stepped surface motor is flush with said first end face (41), and said second face (52) is flush with said second end face (42). Stator structure.

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