JP2012080668A - Stator structure of outer rotor type motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator structure of an outer rotor type motor capable of wiring in good workability by utilizing a space part formed on the outer peripheral side, with a magnetic pole tooth of a stator unit being missed without degrading insulation reliability of a coil lead drawn out of a coil.SOLUTION: Stator units 4a-4d which miss a pair of, upper and lower, magnetic pole teeth 7c and 7d, facing each other, of stator yokes 7a and 7b are laminated together, so that space parts 12a-12d being continued from the missing magnetic pole teeth positions are formed. Connector terminals 11a-11d arranged at the space parts 12a-12d are electrically connected to coil leads drawn out of the coil 6 of the stator units 4a-4d.

Description

  The present invention relates to a stator structure of an outer rotor type motor used in, for example, automobiles, industrial equipment, office equipment and the like.

  In the motor, a rotor including a permanent magnet provided to face the magnetic pole teeth of the stator yoke rotates by switching the direction of current flowing in the coil provided in the stator unit. The coil is connected to the motor board for control such as switching the current direction. For example, in the case of a normal brushless motor, a magnet wire is wound around the stator core in a direction parallel to the output shaft (winding so that the core direction is perpendicular to the axial direction), and the coil winding start and winding end The coil ends are both pulled out in the axial direction and connected to the drive circuit.

  The stator unit of the inner rotor type PM stepping motor is formed by winding a magnet wire around a coil bobbin provided on the outer periphery of the magnetic pole teeth of the stator yoke, and connecting the inner and outer coil ends of the stator through terminals or the like. It was drawn out to the space on the outer peripheral side and connected to a connector or a printed circuit board (see Patent Documents 1 and 2).

  In the stator of the outer rotor type PM step motor, a magnet wire is wound around a coil bobbin provided inside the magnetic pole teeth of the stator yoke, and the coil lead is passed through a gap between the inner peripheral side of the coil bobbin and the outer peripheral side of the bearing housing. For this reason, a coil lead is provided in the guide and the coil end is connected to a connector or a printed circuit board (see Patent Document 3).

JP 2002-78268 A Japanese Patent Laying-Open No. 2005-110377 JP 2007-49844 A

The outer rotor type PM stepping motor has the advantage that it can generate a large torque when compared with the inner rotor type PM stepping motor, but the coil lead must be wired inside the motor. The space for wiring the coil leads cannot be secured sufficiently. Therefore, since wiring must be performed in a very narrow space, there is a problem that it is difficult to ensure the reliability of the insulation between the stator yoke and the coil while the workability of the wiring work is bad.
That is, it is difficult to realize the outer rotor type PM stepping motor because it is difficult to realize the structure with high insulation reliability.

  The present invention has been made to solve these problems, and the object of the present invention is to eliminate the magnetic pole teeth of the stator unit without reducing the insulation reliability of the coil lead drawn from the coil. It is an object of the present invention to provide a stator structure of an outer rotor type motor that can be wired with good workability by utilizing a space portion formed in the inner space.

In order to achieve the above object, the present invention comprises the following arrangement.
A stator in which a plurality of stator units sandwiched between an output shaft and a coil wound with a magnet wire are sandwiched by a stator yoke formed with comb-shaped magnetic pole teeth, and the magnetic pole teeth face each other. And an outer rotor type motor including a rotor that is rotatably supported around the output shaft and a drive circuit terminal portion that is a terminal of a drive circuit that drives the motor. A space portion continuous to the missing magnetic pole tooth position is formed by stacking the stator units lacking the pair of upper and lower magnetic pole teeth facing each other of the stator yoke, and is formed in the space portion. The drive circuit terminal portion arranged and a coil lead drawn from a coil of each stator unit are electrically connected to each other.
According to the above configuration, each stator unit is formed in advance with a space portion that lacks a pair of upper and lower magnetic pole teeth. The formed space is formed. By arranging the drive circuit terminals in this space, it is possible to easily electrically connect the coil leads drawn from the coils of the respective stator units. Therefore, although the motor characteristics are deteriorated, there is no possibility of interference with the rotor, and the stator coil can be reliably and easily wired to the drive circuit terminal.

In addition, the drive circuit terminals are arranged in a space formed by laminating the stator units on a terminal block on which a plurality of drive circuit terminals connected to the coil leads of each stator unit are erected and continuously formed on the outer peripheral surface. And is connected to a coil lead drawn from each stator unit.
According to the above configuration, simply by stacking the stator units on the terminal block so that the space portions are continuous, the drive circuit terminals can be arranged in the space portions and joined to the coil leads drawn from the stator units. it can. Accordingly, it is possible to reliably avoid the interference with the magnetic pole teeth that simplify the coil lead wiring work.

A coil lead holding member formed with a coil lead holding portion exposed between the magnetic pole teeth of the first stator yoke and the second stator yoke is laminated and sandwiched together with the coil in the stator unit. It is characterized by that.
According to the above configuration, the coil lead drawn from the coil of each stator unit is held by the coil lead holding portion exposed between the magnetic pole teeth of the first stator yoke and the second stator yoke, so that the gap between the magnetic pole teeth is reduced. Pass through and wire. Therefore, the wiring work of the coil lead can be easily performed, and the coil lead can be prevented from jumping out to the rotor side.

The outer surface of the stator yoke is coated with an insulating film. And / or the outer periphery of the coil lead wire is covered with an insulating material or coated with an insulating material.
According to the said structure, the reliability of insulation with a coil lead and the magnetic pole tooth of a stator yoke can be improved.

Further, the whole stator is molded.
According to the above configuration, even if the motor is placed in a harsh environment where vibration, thermal expansion, and thermal contraction are repeated, the coil lead does not shift and does not jump out to the rotor side. Can be improved.

  If the stator structure of the outer rotor type motor described above is used, the space portion formed on the outer peripheral side by utilizing the magnetic pole teeth of the stator unit without reducing the insulation reliability of the coil lead drawn from the coil is used. Thus, it is possible to provide a stator structure of an outer rotor type motor that can be wired with good workability.

It is a perspective view of a stator unit. It is a disassembled perspective view of the stator unit of FIG. It is a perspective view of a terminal block. It is a perspective view of the stator which laminated | stacked the stator unit 4 steps | paragraphs on the terminal block.

  Hereinafter, an embodiment of a stator structure of an outer rotor type motor according to the present invention will be described with reference to the accompanying drawings. The outer rotor type motor according to the present embodiment includes a plurality of stator units formed by sandwiching a coil in which a stator is wound in an air core shape with a stator yoke having comb-shaped magnetic pole teeth (claw poles). A claw pole type two-phase stepping motor laminated concentrically will be described as an example.

  A schematic configuration of the two-phase stepping motor will be described with reference to FIG. In FIG. 4, the rotor 1 is provided with permanent magnets 2 alternately magnetized N · S in the circumferential direction on the inner peripheral surface of a cylindrical rotor yoke 3. The permanent magnet 2 is provided so as to face magnetic pole teeth (claw poles) of a stator yoke, which will be described later. The rotor 1 is supported by being integrally connected to an output shaft (not shown).

  The stator 4 is formed by stacking a plurality of stator units 4a to 4d concentrically sandwiching a coil 6 in which a magnet wire is wound in an air core shape between a pair of stator yokes 7a and 7b. A cylindrical body 7g is formed through the output shaft at the center of the fixed yoke 7b, and the coil 6 is assembled concentrically with the cylindrical body 7g (see FIG. 2). A coil lead 8 (not shown) of the coil 6 passes through the gap between the magnetic pole teeth 7c and 7d (claw pole) and is drawn to the outer peripheral side, and is connected to connector terminals (drive circuit terminals) 11c to 11a. The stator units 4a to 4d are stacked concentrically per phase (n is an integer of 1 or more: n = 2 in the present embodiment). In this embodiment, the stator units are stacked in four stages with two phases × 2, and the end portions of the coil leads 8 are generated at four or eight locations.

  Next, the configuration of each stator unit will be specifically described. Since the stator units 4a to 4d have the same configuration, the configuration of the stator unit 4a will be described below. In FIG. 2, a coil 6 and a coil lead holding member 9 are laminated coaxially with the output shaft and sandwiched between a first stator yoke 7a and a second stator yoke 7b. Comb-like magnetic pole teeth 7c and 7d are arranged on the first stator yoke 7a and the second stator yoke 7b so as to form a constant phase difference in the circumferential direction. The outer surfaces of the first stator yoke 7a and the second stator yoke 7b are covered with an insulating film, and the film may be coated with a paint. If an insulating film is not formed on the first stator yoke 7a and the second stator yoke 7b, the coil lead 8 is insulated or coated separately from the insulating coating normally applied to the magnet wire. In order to ensure reliability, it is preferable to be covered with a material (such as a resin tube). Further, on the inner peripheral side of the first stator yoke 7a, an engaging portion 7e that engages and aligns with the concave portion 7h of the cylindrical body 7g projects from the opposing position.

  Further, as shown in FIGS. 1 and 2, the upper and lower pair of magnetic pole teeth 7c and 7d of the stator unit 4a are usually provided in eight pieces, but seven pieces in which the upper and lower pairs are missing are provided. That is, the stator unit 4a is formed with a space portion 12a lacking the magnetic pole teeth 7c and 7d. The same applies to the other stator units 4b to 4d, and space portions 12b to 12d are formed (see FIG. 4). By sequentially stacking the stator units 4a to 4d, space portions 12a to 12d are continuously formed at the missing magnetic pole tooth positions as shown in FIG.

  As shown in FIG. 2, the coil lead holding member 9 is made of an insulating material and is formed into a C shape having a notch 9d. A bridging portion 9f is formed across the outer peripheral side of the notch 9d. When the coil lead holding member 9 is sandwiched between the coil 6 and the stator yoke 7b, it corresponds to a notch 9d that penetrates from the inner periphery side to the outer periphery side of the coil lead holding member 9 between the coil 6 and the stator yoke 7b. A gap is formed. By passing the coil lead 8 on the inner peripheral side of the coil 6 through this gap, the coil lead 8 is moved from the inner peripheral side to the outer peripheral side of the coil 6 on the bridging portion 9f without receiving a force that crushes the coil lead 8. It can be pulled out. Needless to say, the coil lead holding member 9 is preferably thicker than the maximum outer diameter of the magnet wire used in the motor.

  As a result, the coil 6 sandwiched between the first stator yoke 7a and the second stator yoke 7b can be wound around the outer circumference of the cylindrical body 7g in the axial direction, and the coil on the inner circumference side of the coil 6 can be wound. The lead 8 can be drawn out to the outer peripheral side of the bridging portion 9f using the gap of the notch portion 9d and connected to connector terminals 11a to 11d described later.

  In FIG. 4, the outer surfaces of the first stator yoke 7a and the second stator yoke 7b are covered with an insulating film, but the outer periphery of the coil lead 8 of the coil 6 is covered with an insulating material (such as a resin tube). Or an insulating coating different from the insulating coating normally applied to the magnet wire may be coated. According to the above configuration, it is possible to improve the reliability of insulation between the coil lead 8 drawn from the coil 6 and the first and second stator yokes 7a and 7b.

  Although not shown, the outer periphery of the stator may be molded with the molding resin 10 so that the magnetic flux acting surfaces of the magnetic pole teeth 7c and 7d of the stator units 4a to 4d are exposed. According to the above configuration, even if the motor is placed in a harsh environment where vibration, thermal expansion, and thermal contraction are repeated, the coil lead 8 is not displaced and does not jump out to the rotor side. And reliability can be improved.

  It is not always necessary to expose the magnetic flux acting surfaces of the magnetic pole teeth 7c and 7d of the stator units 4a to 4d, and it may be determined whether or not to be exposed depending on the product and application (implementation status). Further, if the magnetic flux acting surfaces of the magnetic pole teeth 7c and 7d are exposed, there is an advantage that torque is easily generated because the gap with the permanent magnet 2 is small, but the mold resin can drop from the stator units 4a to 4d. And low reliability. On the other hand, when the magnetic flux acting surfaces of the magnetic pole teeth 7c and 7d are not exposed, the torque is difficult to be generated contrary to this, but the possibility of falling off is low and the reliability is improved.

  To assemble the stator 4 described above, a terminal block 11 shown in FIG. 3 is used. In the terminal block 11, a plurality (four) of connector terminals (drive circuit terminals) 11a to 11d are formed upright on the base 11e. Stator units 4d to 4a are sequentially stacked on the base 11e. At this time, as shown in FIG. 4, space portions 12d to 12a are continuously formed on the outer peripheral surface of the stator 4, and connector terminals (drive circuit terminals) 11c to 11a are fixed to the space portions 12d to 12a. The coil lead holding member 9 provided from the child unit 4d side is arranged so as to pass through the inner peripheral side (notch portion 9d side; see FIG. 2) of the bridging portion 9f and prevent the coil lead holding member 9 from protruding to the rotor side. And it joins with the coil lead 8 (not shown) each pulled out from the coil 6 of each stator unit 4a-4d via the notch part 9d.

  According to the above configuration, the connector terminals 11d to 11a are arranged in the space portions 12d to 12a simply by stacking the stator units 4d to 4a on the base 11e of the terminal block 11 so that the space portions 12d to 12a are continuous. The coil leads 8 drawn from the stator units 4d to 4a can be joined. Therefore, it is possible to simplify the wiring work of the coil lead 8 and to reliably avoid the interference with the magnetic pole teeth 7c and 7d.

  In the above-described embodiment, the claw pole type two-phase stepping motor is illustrated, but the present invention is not limited to this, and the three-phase, four-phase,. It is also possible to apply to a multiphase stepping (brushless) motor such as a phase. In the above-described embodiment, the connector terminals 11d to 11a are disposed in the space portions 12d to 12a and joined to the coil leads 8 drawn from the stator units 4d to 4a. The coil leads 8 drawn out from the units 4d to 4a are arranged in the space portions 12d to 12a, and are shorter than the example shown in FIG. You may join.

DESCRIPTION OF SYMBOLS 1 Rotor 2 Permanent magnet 3 Rotor yoke 4 Stator 4a, 4b, 4c, 4d Stator unit 6 Coil 7a First stator yoke 7b Second stator yoke 7c, 7d Pole teeth 7e Engagement part 7f Engagement protrusion 8 Coil lead 9 Coil lead holding member 9d Notch portion 9f Bridge portion 10 Mold resin 11 Terminal block 11a, 11b, 11c, 11d Connector terminal 11e Base

Claims (6)

A stator in which a plurality of stator units sandwiched between an output shaft and a coil wound with a magnet wire are sandwiched by a stator yoke formed with comb-shaped magnetic pole teeth, and the magnetic pole teeth are opposed to each other. And an outer rotor type motor including a rotor that is rotatably supported around the output shaft and a drive circuit terminal portion that is a terminal of a drive circuit that drives the motor. The stator structure of
The drive circuit terminal portion disposed in the space portion formed by stacking the stator units lacking the pair of upper and lower magnetic pole teeth opposed to the stator yoke to form a space portion continuous to the position of the missing magnetic pole teeth. A stator structure of an outer rotor type motor, wherein a coil lead drawn from a coil of each stator unit is electrically connected to each other.   The drive circuit terminals are arranged in a space formed continuously on the outer peripheral surface by stacking the stator units on a terminal block in which a plurality of drive circuit terminals connected to the coil leads of each stator unit are formed upright. The stator structure of the outer rotor type motor according to claim 1, wherein the stator structure is joined to a coil lead drawn from each stator unit.   A coil lead holding member formed with a coil lead holding portion exposed between the magnetic pole teeth of the first stator yoke and the second stator yoke forming the stator unit is laminated together with the coil in the stator unit. The stator structure of the outer rotor type motor according to claim 1 or 2, wherein the stator structure is sandwiched or stacked between the stator units and the stator unit on the coil lead drawing end side.   The stator structure of the outer rotor type motor according to any one of claims 1 to 3, wherein an outer surface of the stator yoke is coated with an insulating film.   The stator structure of the outer rotor type motor according to any one of claims 1 to 4, wherein an outer periphery of the coil lead wire is covered with an insulating material or coated with an insulating material.   The stator structure of the outer rotor type motor according to any one of claims 1 to 5, wherein the entire stator is molded.

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