JP3800506B2 - Gap winding motor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gap winding motor that does not have a convex portion called a tooth for winding an armature winding around a gap between a stator and a mover. This gap winding motor is suitable for use in electric power steering, air conditioners and the like.
[0002]
[Prior art]
As shown in FIG. 7, in a gap winding motor in which a rotor 81 as a mover rotates relative to a stator 80 as a stator, the stator 80 and the rotor 81 face each other with a gap 82 therebetween. ing.
[0003]
The stator 80 includes a cylindrical frame 80a and a stator core 80b fixed to the inner periphery of the frame 80a. Brackets 83 and 84 are fixed to both ends of the frame 80a, and bearing devices 85 and 86 are provided in shaft holes of the brackets 83 and 84, respectively. The stator core 80b has a cylindrical shape formed by laminating thin ring-shaped silicon steel plates in the axial direction.
[0004]
On the other hand, the rotor 81 is fixed substantially at the center of the rotating shaft 87 that is supported by the bearing devices 85 and 86. The rotor 81 includes a rotor main body 81a, a mover iron core 81b provided integrally on the outer periphery of the rotor main body 81a, and a permanent magnet 81c embedded in the outer periphery of the mover iron core 81b. The mover core 81b is also a cylindrical one formed by laminating thin ring-shaped silicon steel plates in the axial direction.
[0005]
Of the gap 82 located between the stator core 80b of the stator 80 and the mover core 81b of the rotor 81, the gap 82a has an armature winding fixed to the stator core 80b as shown in FIG. 88 is provided. Of the gaps 82, the gap 82 b is a minute gap for rotating the rotor 81 without contacting the armature winding 88. The armature winding 88 is usually formed in a cylindrical shape after a wire having an outer peripheral surface insulated is wound at equal intervals on a parallelogram or a turtle shell forming a U phase, a V phase, and a W phase. Is. As shown in FIG. 9, the armature winding 88 formed in this way is inserted into the stator core 80b and then embedded in the resin 89, thereby being fixed to the stator core 80b. Thus, as shown in FIG. 7, the armature winding 88 fixed to the stator 80 and provided in the gap 82a has three sets of U-phase, V-phase, and W-phase lead wires 88a on the outside of the frame 80a. In this way, an alternating current is passed through them.
[0006]
In the gap winding motor configured as described above, by passing an alternating current through the U-phase, V-phase and W-phase of the armature winding 88, the permanent magnet 81c, the applied current, the effective conductor length in the magnetic field, and Is generated, and the rotor 81 rotates together with the rotary shaft 87. Thus, in this gap winding motor, the rotational force is extracted by the rotary shaft 87. In particular, in this gap winding motor, the armature winding 88 is embedded in the resin 89 in the gap 82a, and the teeth are not present in the gap 82a.
[0007]
[Problems to be solved by the invention]
However, in the conventional gap winding motor, since the armature winding is embedded in a resin that is a non-magnetic material, the magnetic resistance increases due to the radial thickness of the resin, and the armature winding is linked to the armature winding. However, even if an alternating current with a large current value is applied, the rotor does not move with a large driving force, such as being difficult to rotate with a large high torque. bad.
[0008]
In this regard, it is conceivable to embed the armature windings with a magnetic material and eliminate the magnetic resistance between them. There is a possibility that the driving force of the mover cannot be obtained due to the influence.
[0009]
The present invention has been made in view of the above-described conventional situation, and an object to be solved is to provide a gap winding motor having excellent operation efficiency of the movable element with respect to the current value.
[0010]
[Means for Solving the Problems]
The present inventors have intensively studied to solve the above problems, and have considered that the above problems can be solved by adopting a magnetic powder whose surface is electrically insulated, thereby completing the present invention. .
[0011]
That is, the gap winding motor of the present invention faces a stator, a gap between the stator and a movable element that is movable relative to the stator, and is fixed to the stator. In a gap winding motor including an armature winding provided in the gap, the armature winding is embedded in the gap by a filler made of magnetic powder whose surface is electrically insulated. It is characterized by.
[0012]
In the gap winding motor of the present invention, the filling material in which the armature winding is embedded in the gap is a magnetic powder whose surface is electrically insulated. Therefore, the magnetic flux between the stator and the mover occupies most of the gap. The gap is easily passed by the magnetic powder.
[0013]
That is, in the conventional gap winding motor, the length that the magnetic flux between the stator and the mover receives the magnetic resistance is generally referred to as the air gap length. Here, if the armature winding is embedded with a non-magnetic material in the gap that is the length between the stator and the mover, the space between the armature winding and the rotor necessary for rotating the rotor is assumed. And the non-magnetic material receive a large magnetic resistance, and in particular, the ratio of the magnetic resistance due to the armature winding portion (non-magnetic material) having a large radial thickness compared to the fine gap. large. On the other hand, if the armature winding is embedded in the gap with a filler made of magnetic powder whose surface is electrically insulated as in the present invention, the magnetoresistance of the filler made of armature winding and magnetic powder Is merely the total thickness of the surface of each magnetic powder, and the magnetic resistance is reduced as compared with a conventional motor in which the filler is made of a non-magnetic material. For this reason, the magnetic flux between the stator and the mover passes through the gap with a large magnetic flux density.
[0014]
Therefore, the gap winding motor of the present invention is excellent in operating efficiency of the mover with respect to the current value.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment in which the gap winding motor of the present invention is embodied will be described with reference to the drawings.
[0016]
As shown in FIG. 1, the gap winding motor of the embodiment is such that a rotor 11 as a mover rotates relative to a stator 10 as a stator. The stator 10 and the rotor 11 face each other with a gap 12 therebetween.
[0017]
The stator 10 includes a cylindrical frame 10a and a stator core 10b fixed to the inner periphery of the frame 10a. The stator core 10b has a cylindrical shape formed by laminating thin ring-shaped silicon steel plates in the axial direction.
[0018]
On the other hand, the rotor 11 includes a rotor body 11a fixed to the rotating shaft 17, a mover core 11b integrally provided on the outer periphery of the rotor body 11a, and a permanent magnet 11c embedded in the outer periphery of the mover core 11b. Consists of. The armature core 11b is also a cylindrical one formed by laminating thin ring-shaped silicon steel plates in the axial direction.
[0019]
An armature winding 18 fixed to the stator core 10b is provided in the gap 12 located between the stator core 10b of the stator 10 and the mover core 11b of the rotor 11. The gap 12 includes a gap 12 a in which the armature winding 18 is located and a gap 12 b between the armature winding 18 and the rotor 11 necessary for rotating the rotor 11.
[0020]
The armature winding 18 is manufactured as follows. First, as shown in FIG. 3, the same wire 18a as in the prior art is wound by the winding mold 20, and as shown in FIG. 4, each is formed in a turtle shell coil 18b. Each turtle-shaped coil 18b is overlapped in the order of the U phase, the V phase, and the W phase by the number of multiples of 3 that are equally spaced from each other to form a double coil 18c. As shown in FIG. 5, the double coil 18c is wound around a mandrel 21 to form a cylindrical coil 18d as shown in FIG. As shown in FIG. 1, the obtained cylindrical coil 18d is inserted into the stator core 10b, and three sets of lead wires 18e of U phase, V phase and W phase are guided outward. Line 18.
[0021]
On the other hand, as shown in FIG. 2, the surface of soft magnetic powder I containing iron as a main component is filled with a phosphoric acid coating P and a nylon resin coating N that are electrically insulating (Sumitomo Electric Co., Ltd.). ) “FM-CM material”) 19 is prepared.
[0022]
The stator core 10b in which the armature winding 18 is inserted is inserted into a mold cavity (not shown). This cavity has the same gap as the gap 12a between the inner peripheral surface of the stator core 10b. In this gap, the filling material 19 is densely filled around the armature winding 18 and heated to about 200 ° C. in this state. Thereby, since the nylon resin coating N serves as a binder, the filler 19 is fixed to each other, the armature winding 18 is fixed to the stator core 10 b by the filler 19. The stator core 10b to which the armature winding 18 is fixed is fixed to the inner periphery of the frame 10a and becomes the stator 10.
[0023]
Thus, in the obtained gap winding motor, the armature winding 18 is buried with the filler 19 in the gap 12a of the gap 12 located between the stator core 10b and the mover core 11b. Yes. In the armature winding 18, three sets of lead wires 18e of U phase, V phase, and W phase are guided to the outside of the frame 10a, and an alternating current is supplied from the lead wire 18e.
[0024]
In the gap winding motor of the embodiment configured as described above, the inner peripheral surface of the stator core 10b in the stator 10 is formed by supplying an alternating current to the U phase, the V phase, and the W phase of the armature winding 18. It is magnetized sequentially to the north or south pole in the circumferential direction. As a result, the rotor 11 is attracted or repelled by the permanent magnet 11c, and the mover core 11b forms a magnetic path with the stator core 11b. For this reason, the rotor 11 rotates together with the rotating shaft 17. Thus, in this gap winding motor, the rotational force is taken out by the rotary shaft 17.
[0025]
In particular, in this gap winding motor, since the armature winding 18 is embedded in the filler 19 in the gap 12a, the magnetic flux between the stator core 10b and the mover core 11b is the nylon resin of the filler 19. The magnetic flux density is not reduced so much by the coating N, and the soft magnetic powder I occupying most of the filler 19 can easily pass through the gap 12a.
[0026]
That is, in this gap winding motor, the air gap length as a length in which the magnetic flux between the stator core 10 b and the mover core 11 b receives the magnetic resistance in the gap 12 is between the armature winding 18 and the rotor 11. Since the total thickness of the gap 12b and the phosphoric acid coating P and the nylon resin coating N of each filler 19 present in the gap 12a is extremely short. Therefore, it is desirable that the thicknesses of the phosphoric acid coating P and the nylon resin coating N be as thin as possible within a range that does not impair the electrical insulation and the function as the binder .
[0027]
For this reason, in this gap winding motor, the magnetic flux between the stator iron core 10b and the mover iron core 11b can pass through the gap 12 with a high magnetic flux density.
[0028]
Therefore, in this gap winding motor, the torque generation efficiency of the mover 11 with respect to the current value of the alternating current can be improved.
[0029]
The above embodiment is a gap winding motor in which the mover rotates relative to the stator. However, the present invention can also be embodied in a gap winding motor in which the mover moves relative to the stator in a straight line. Needless to say.
[Brief description of the drawings]
FIG. 1 is an enlarged cross-sectional view of a gap winding motor according to an embodiment.
FIG. 2 is an enlarged cross-sectional view of a filler according to an embodiment.
FIG. 3 is a plan view showing a state in which the wire of the embodiment is wound around a winding mold.
FIG. 4 is a plan view of the turtle shell coil and the heavy wound coil of the embodiment.
FIG. 5 is a plan view of the heavy wound coil according to the embodiment.
FIG. 6 is a perspective view of a cylindrical coil according to the embodiment.
FIG. 7 is a longitudinal sectional view of a conventional gap winding motor.
FIG. 8 is a cross-sectional view of a conventional gap winding motor.
FIG. 9 is an enlarged cross-sectional view of a conventional gap winding motor.
[Explanation of symbols]
10 ... Stator
12, 12a, 12b ... Gap 11 ... Motor (rotor)
18 ... Armature winding I ... Magnetic powder (soft magnetic powder)
19 ... filler

Claims (2)

A stator, a movable element facing with a gap between the stator and movable relative to the stator, and an armature winding fixed to the stator and provided in the gap In the gap winding motor with
In the gap, the armature winding is embedded with a filler made of magnetic powder whose surface is electrically insulated. The gap winding motor according to claim 1, wherein the filler is obtained by coating the surface of the magnetic powder with a phosphate coating.

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