JP2012010537A - Claw-pole type motor for ceiling fan - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve easy and thin configuration of a stator of a motor for a ceiling fan that needs a multipolar coil.SOLUTION: Claw-pole shaped stator iron cores 2a, 2b are mounted on a hollow-pipe shaped rotation axis 1 through a resin 6. The stator iron cores 2a, 2b are formed with comb-teeth shaped multipolar magnetic poles on their outer peripheral sides, and provided with ring-shaped stator coils 3a, 3b inside. The stator iron cores 2a, 2b have the same shape, are stacked in the axial direction with their central axis positions matching, and compose a two-phase induction motor stator.

Description

  The present invention relates to a motor for a ceiling fan provided with a claw pole type stator.

  Conventionally, this type of ceiling fan motor has an abduction type rotor structure, and a stator winding is mounted in a slot portion provided in an outer peripheral portion of a stator core disposed inside. (For example, refer to Patent Document 1).

  In addition, this type of ceiling fan motor employs many induction motors, and the stator winding is composed of multiple poles to match the characteristics of a ceiling fan that rotates at a low speed. Is known (for example, see Patent Document 2).

  Hereinafter, the configuration of this type of motor described in Patent Document 1 will be described with reference to FIG.

  As shown in FIG. 5, a stator core 103 to which a stator winding 102 is attached is fixed to a rotary shaft 101 having a hollow pipe shape. The rotor core 104 is provided outside the stator core 103 and is integrally formed of aluminum die casting or the like. A blade 105 is attached to the lower end in the axial direction with a screw or the like and is attached to the rotary shaft 101. The bearing 106 is held so that it can freely rotate. A receiver 107 of a remote control switch is provided at the lowermost end of the rotating shaft 101 and is connected to a control circuit 108 that is supplied with power through a hollow portion of the rotating shaft 101 and is controlled for operation.

  6 and 7 described in Patent Document 2 show a stator of a ceiling fan motor that is also an abduction type induction motor, and a rotating shaft 109 that is a hollow pipe shape is laminated. It is fixed to the stator core 110. The outer periphery of the stator core 110 is provided with a slot for mounting a winding, and a two-phase winding of a main winding 111a and an auxiliary winding 111b is mounted. Since the number is operated at a low speed of 300 rpm or less, it is often composed of multiple poles, and in this example, it is 14 poles, so a total of 28 coils are mounted. The phase advance capacitor 112 is held by the terminal base 114 attached to the rotating shaft 109 by the engaging portion 113.

Japanese Patent Laid-Open No. 5-113192 JP 2009-71913 A

  Since the conventional ceiling fan motors shown in FIGS. 5, 6 and 7 described in Patent Documents 1 and 2 are rotated at a low speed, the stator needs to be configured with multiple poles. The number of sub-windings is very large and the number of manufacturing steps is large, and both ends of the windings protrude from the stator core, so there is a problem that the axial dimension of the motor becomes long. There is a demand to realize a fan motor.

  The present invention solves such a conventional problem, and by making the stator of the ceiling fan motor a claw pole type of 12 poles or more, a multipole structure can be realized with a simple configuration, The purpose is to realize an inexpensive and thin ceiling fan motor.

  In order to achieve the above object, the ceiling fan motor of the present invention has a stator core having a claw pole structure of 12 poles or more.

  This means that even if the stator is multipolar, it is not necessary to provide a winding for each pole, and a multipolar stator can be realized simply by forming one coil in a donut shape. In addition, since the winding does not protrude from the stator core, the axial dimension is reduced, and a thin ceiling fan motor can be realized.

  According to the present invention, since the stator has a claw pole structure having 12 or more poles, it is not necessary to provide a winding for each pole even in a multi-pole motor, and one coil is formed in a donut shape. Since a multi-pole stator can be realized simply by forming it, it is possible to manufacture a low-speed ceiling fan motor stator that is normally operated at a low speed of about 300 rpm at low cost. In addition, since the winding is housed in the stator core and the winding does not protrude in the axial direction, the motor can be thinned and suspended from the ceiling, so there is a strong need for a thin flat shape. Ideal as a ceiling fan motor.

Plan sectional drawing of the motor for ceiling fans of the 1st Embodiment of this invention External perspective view of the stator Plan sectional drawing of the ceiling fan motor of the 2nd Embodiment of this invention External perspective view of the stator Plan sectional view of a conventional ceiling fan motor Front view showing the stator of the induction motor for other ceiling fans Partial plan sectional view of the stator of the induction motor

  The invention according to claim 1 of the present invention is a ceiling fan motor employing a claw pole structure stator having a pole number of 12 poles or more, wherein the multipole stator includes a donut-shaped coil, The coil is housed inside, and the part facing the rotor is composed of a stator core with comb-shaped pole teeth, so a multi-pole stator can be realized with a simple structure, and the winding is the stator core. The motor is thinned because it is housed inside and does not protrude in the axial direction.

  Further, it is constituted by an outer rotor type motor, a plurality of blades are provided on the outer periphery of the rotor, and the central axis to which the stator is fixed is fixed to the ceiling. By this means, it becomes possible to secure a space that does not require the magnetic flux to pass through the inner peripheral portion of the stator, and the inner peripheral portion is formed of a non-magnetic material or an axial through hole is provided. The ceiling fan motor with a high degree of design freedom can be realized.

  In addition, it is equipped with a stator formed by stacking two layers of claw-pole type stator cores. Two ring-shaped stator cores of the same shape are stacked in the axial direction so that their center positions coincide with each other. A stator is formed by shifting the electrical angle by 90 degrees in the circumferential direction, and a capacitor is connected in series to one of the stator windings to form an auxiliary coil phase, and the remaining stator core is used as the main coil phase. By doing so, it becomes possible to make a stator of a two-phase motor. By combining this two-phase stator and a rotor formed of aluminum die casting or the like, a multi-pole ceiling fan condenser run induction motor that does not require a special circuit for driving can be constructed at low cost. it can.

  Another means is that the iron core of the stator of the motor is formed by a dust core.

  By this means, it becomes possible to increase the thickness of the stator core, and to realize a thin ceiling fan motor with a large torque.

  Another means is that the inner diameter portion of the stator core disposed inside the rotor is formed of resin.

  By this means, the weight of the stator portion can be reduced, and an inexpensive and light-weight thin ceiling fan motor can be realized.

  Another means is that a control circuit for driving the motor is arranged on the inner diameter portion of the stator core.

  By this means, the capacitors and control circuits necessary for driving the motor and the control circuits of the main body such as remote control switches and lighting are housed in the space inside the stator core that does not contribute to torque generation. There is no need to store it, and a thinner ceiling fan motor can be realized.

  In addition, the claw pole type stator is configured by integrally sealing with a thermosetting resin, and the stator core is installed in the mold and is integrally sealed with resin. It is easy to hold the stator core and ensure accuracy. In addition, the heat generated in the stator windings is easily dissipated by the thermosetting resin with high thermal conductivity, and a high-quality and thin ceiling fan motor with low temperature rise can be realized. Even if the coating film deteriorates and excessive current flows through the motor winding, resulting in high heat that ignites, it is sealed with thermosetting resin, so there is no air supply, and there is no smoke or ignition A thin ceiling fan motor can be realized.

  In addition, since the brushless DC motor is used, it is possible to realize a thin ceiling fan motor that can easily control the rotation speed and is highly efficient.

  In addition, by using a three-phase brushless DC motor formed by stacking three layers of claw pole type stator cores, the motor can be driven with high efficiency and low noise, and energy-saving operation with low power consumption is possible. A quiet and thin ceiling fan motor can be realized.

  In addition, the three-phase brushless DC motor is formed by stacking three layers of claw pole type stator cores, and three core cores of the same shape claw pole structure are stacked in the axial direction, It is possible to form a three-phase stator by matching the positions and shifting the electrical angle by 120 degrees in the circumferential direction, and combining this three-phase stator and a rotor formed using a magnet As a result, a three-phase brushless DC motor for a ceiling fan that can be driven with high efficiency and with easy rotation speed control can be configured at low cost.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 1 is a cross-sectional view of an external rotation type capacitor run induction motor according to a first embodiment of the present invention, and FIG. 2 is an external view of the stator.

  A hollow pipe-shaped rotating shaft 1 is provided with claw pole-shaped stator cores 2a and 2b with a resin 6 interposed therebetween. The stator cores 2a and 2b are formed with comb-shaped multipolar magnetic poles on the outer peripheral side, and are provided with ring-shaped stator windings 3a and 3b. The stator cores 2a and 2b have the same shape, and are stacked in the axial direction with their center axis positions matched, but in a state where they are shifted by 90 degrees from each other in the electrical direction in the circumferential direction. , And is integrally held by the resin 6 to constitute a stator of a two-phase induction motor. The control circuit 7 of the main body is equipped with a phase-advancing capacitor 8 and controls the operation of the ceiling fan by the output of the remote control light receiving unit 12 provided at the lower end of the rotating shaft 1. The control circuit 7 of the main body is provided with a recess in a part of the resin 6, is installed in the inner diameter portion of the stator cores 2a and 2b, and is connected to the stator windings 3a and 3b. A rotor core 4 in which an aluminum die cast 5 is cast is disposed outside the stator cores 2a and 2b via a gap, and is rotatably held through a rolling bearing 9 press-fitted and fixed to the rotary shaft 1. ing. A motor cover 10 to which blades 11 are attached is fixed to the aluminum die casting 5 on the side opposite the ceiling in the drawing with screws. A remote control light receiving portion 12 for driving is provided in the concave portion in the lower center portion of the motor cover 10.

  In this embodiment, when the operation is instructed by the remote control switch and energization of the stator windings 3a and 3b is started, the stator cores 2a and 2b are arranged with an electrical angle shifted by 90 degrees, and the phase advance capacitor Since 8 is connected to the stator windings 3a and 3b, it rotates as a capacitor run type induction motor. In this embodiment, the comb-like magnetic poles of the stator cores 2a and 2b are composed of 32 poles, and rotate at a low speed of 187 rpm or less when a power supply with a frequency of 50 Hz is supplied. As a result, the stator of the motor for a ceiling fan that is normally operated at a low speed and is multi-polar is simply configured by stacking two layers of the stator cores 2a and 2b including the ring-shaped stator windings 3a and 3b. . The ring-shaped stator windings 3a and 3b are housed in the stator cores 2a and 2b, so that the axial dimension can be reduced. Further, since the main body control circuit 7 including the phase-advancing capacitor 8 is installed in a space where the magnetic flux does not flow inside the stator cores 2a and 2b, the main body control circuit 7 is installed in another space. Thus, a thin ceiling fan motor that does not need to be reduced and does not deteriorate in motor characteristics is realized.

  In this embodiment, the number of magnetic poles of the stator core is 32. However, the number of poles is not necessarily 32. In short, the number of poles that can be rotated at a low speed is 12 or more that realizes a general low-speed rotation. Good.

  The stator cores 2a and 2b may be formed by bending an iron plate or by a dust core. However, when formed by a dust core, the thickness of the stator core can be increased. Thus, more magnetic flux can be passed through the stator cores 2a and 2b, so that a motor with higher torque can be realized.

(Embodiment 2)
FIG. 3 is a cross-sectional view of an abduction type three-phase brushless DC motor according to the second embodiment of the present invention, and FIG. 4 is an external view of the stator. The claw pole type stator cores 13u, 13v, and 13w have the same shape as the first embodiment, and are provided with ring-shaped stator windings 14u, 14v, and 14w inside, Comb-shaped multipolar magnetic poles are formed on the side. The three stator cores 13u, 13v, and 13w are stacked in the axial direction in a state where the center positions thereof are coincident with each other, but the mold resin 17 is shifted in an electrical angle of 120 degrees in the circumferential direction. And are integrally held to constitute a stator of a three-phase brushless DC motor. At the lower end of the mold resin 17 in the axial direction, a projection 21 is provided that protrudes from the outer diameter of the stator cores 13u, 13v, 13w to the rotor 16 side. A wiring board 20 on which a Hall element 19 for detecting the magnetic pole of the magnet 15 is mounted is housed inside the protrusion 21. The mold resin 17 on the inner diameter side of the stator cores 13u, 13v, and 13w is formed with a small axial dimension, and a control circuit 18 of the brushless DC motor is disposed in a space secured thereby. A rotor 16 that holds the magnet 15 at the inner diameter is disposed outside the stator cores 13u, 13v, and 13w via a gap. Has been. Other configurations are the same as those in the first embodiment, and a description thereof will be omitted.

  In this embodiment, when the operation is instructed by the remote control switch and energization of the stator windings 14u, 14v, 14w is started, the stator cores 13u, 13v, 13w are arranged so as to be shifted by 120 degrees in electrical angle. In accordance with the magnetic pole position of the magnet 15 detected by the Hall element 19, energization is started in appropriate phases of the stator windings 14u, 14v, 14w. And it rotates as a three-phase brushless DC motor, but the comb-like magnetic poles of the stator cores 13u, 13v, and 13w are composed of 32 poles as in the first embodiment, and have low speed and high torque. It becomes possible to realize a ceiling fan motor that can be operated with high efficiency and whose rotation speed can be easily changed. As in the first embodiment, a multi-pole stator having a small axial dimension can be easily configured, and the control circuit 18 can be disposed inside the stator, so that a thin ceiling fan can be realized. Further, as in the first embodiment, the number of magnetic poles of the stator does not need to be 32, and the material of the stator cores 13u, 13v, and 13w may be an iron plate or a dust core.

  In this embodiment, the three-phase brushless DC motor is used. However, the three-phase brushless DC motor is not required, and the same effect can be realized by a two-phase brushless DC motor.

  As described above, since the stator core of the ceiling fan motor according to the present invention has a claw pole structure, a multi-pole stator can be easily formed with a ring-shaped coil, and the winding does not protrude from the stator core. Since the axial dimension can be reduced, it is suitable as a ceiling fan motor that is rotated at a low speed and is suspended from the ceiling and used for a thin profile.

2a, 2b Stator core 3a, 3b Stator winding 4 Rotor core 8 Capacitors 13u, 13v, 13w Stator core 14u, 14v, 14w Stator winding 16 Rotor 17 Mold resin

Claims (9)

A ceiling fan using a claw-pole motor with 12 or more poles. The motor is an outer rotor type,
A plurality of blades are provided on the outer periphery of the rotor of this motor,
The ceiling fan according to claim 1, wherein the central axis to which the stator is fixed is fixed to the ceiling. The ceiling fan according to claim 1 or 2, wherein the motor is a capacitor-run induction motor including a stator formed by stacking two layers of claw pole type stator cores and a phase advance capacitor. The ceiling fan according to any one of claims 1 to 3, wherein the stator core is formed of a dust core. The ceiling fan according to any one of claims 1 to 4, wherein an inner diameter portion of the stator core is formed of a resin. The ceiling fan according to any one of claims 1 to 5, wherein a control circuit for driving a motor is disposed on an inner diameter portion of the stator core. The ceiling fan according to any one of claims 1 to 6, wherein the stator is integrally sealed with a thermosetting resin. The ceiling fan according to any one of claims 1 to 7, wherein the motor is a brushless DC motor. 9. The ceiling fan according to claim 8, wherein the stator is a three-phase brushless DC motor formed by stacking three layers of claw pole type stator cores.

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