JPH118952A - Inner rotor motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a low-cost, high-performance inner rotor motor by solving two problems, a winding nozzle contacts the cylindrical parts of a stator and coils cannot sufficiently be wound on the protruding pole parts of the stator, and a problem caused by interference with crossovers provided between the winding nozzle and the protruding pole part of the stator. SOLUTION: In a stator in which its protruding pole parts 2 and its cylindrical parts 1 are integrally structured, the problems of the interference of a winding nozzle with the cylindrical part 1 of a stator and with the crossovers of windings 6 are solved by providing recessed parts 3 on the cylindrical parts 1 of the stator or cut and raised parts 4 an a part of the cylindrical parts 1. The windings 6 can be sufficiently wound on the protruding pole parts 2 of the stator, so that this solution enables obtaining an inexpensive, high- performance inner rotor motor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an inner rotor type brushless motor used for a magnetic storage device, for example, a tape streamer.

[0002]

2. Description of the Related Art In recent years, tape streamers have tended to be thinner and have higher performance, and motors used therein have also been required to be thinner, have lower inertia and have higher performance.

Conventionally, in order to realize a brushless motor with low inertia, a means of an inner rotor type is generally used. A salient pole of a stator is arranged outside a magnet so as to face the magnet, and a convex pole is applied to the salient pole. By supplying power to the winding
A structure for rotating a rotor portion having a magnet is well known.

FIG. 5 is a plan view of a conventional inner rotor type brushless motor, FIG. 6 is a half sectional view of the same, FIG. 7 is a half plan view showing a winding state of the stator, and FIG. It is a half-plan view showing a continuous winding state. 5 and 6, 2
Reference numeral 1 denotes a stator cylindrical portion, 22 denotes a stator salient pole portion, 21 and 22 integrally form a stator, and are formed of laminated electromagnetic steel plates and the like. Pole part 2
2 is provided with a winding 24 and is fixed to a printed wiring board 25 by bonding or the like. Reference numeral 26 denotes a fixed shaft, which is fixedly fastened to the printed wiring board 25 by caulking or the like, and a boss 28 is fixed to the upper portion by a screw 27 to hold a bearing 29. The magnet 30 is fixed to a rotor frame 31, and the rotor frame 31 is fixed to a housing 32 by press fitting or the like.
9 rotatably supported.

The operation of the inner rotor motor configured as described above will be described below. First,
A signal obtained by detecting a magnetic flux of driving magnetization (not shown) applied to the magnet 30 by a magnetic detection element (not shown) arranged between the stator salient pole portions 22 is subjected to arithmetic processing by a logic circuit. Then, the current distribution for driving the motor is determined as needed. Next, the coil is energized in accordance with the above-described current distribution to generate a magnetic field, attract and repel the magnet 30 and rotate the motor.

FIG. 7 shows a winding state of the stator.
21 is the above-described stator cylindrical portion, 22 is the stator salient pole portion,
Reference numeral 24 denotes a winding, and 33 denotes a winding nozzle.
The winding 24 is sequentially applied to the stator salient pole portion 22 by rotating around the periphery of the stator 2. FIG. 8 is a view showing a case where the windings 24 to the respective stator salient pole portions 22 are continuously applied in the above-described winding method. The stator cylindrical portion 21 and the stator salient pole portions 2 are shown.
2. In addition to the winding 24, there is a crossover 34 for applying the winding 24 continuously.

In addition to the above-described stator winding method, the stator is divided into a plurality of parts as shown in JP-A-61-124241. There is known a means for forming an annular stator by performing the above-mentioned steps and then combining them.

[0008]

However, in the above-mentioned conventional configuration, as shown in FIG.
If the winding 24 cannot be applied over the entire length of the stator salient pole portion 22 or if the winding is continuously applied due to the constraint that the tip of the As described above, the crossover wire 34 is generated, and the movable range of the winding nozzle is restricted, so that it is not possible to apply the sufficient winding 24 to the stator salient pole portion 22. As a result, a sufficient amount of motor is required. There was a problem that a high torque performance could not be obtained. In addition, the above-mentioned Japanese Patent Application Laid-Open No.
As shown in JP-A-241-241, when a stator is divided into a plurality of pieces and a winding is applied, even if sufficient winding can be applied to each stator salient pole portion, the stator is divided. However, there is a problem that the cost increases because the stator is connected to the annular stator.

An object of the present invention is to solve the above-mentioned conventional problems and to provide an inexpensive and high-performance inner rotor motor.

[0010]

In order to solve the above-mentioned problems, an inner rotor motor of the present invention is provided with a concave portion in a stator cylindrical portion or a portion of a stator cylindrical portion cut and raised. is there. By the above means, the problem of the contact between the winding nozzle and the stator cylindrical portion and the problem of the crossover of the winding can be solved, and the winding can be applied over the entire length of the stator salient pole portion.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention can be carried out in the form described in each claim. As described in claim 1, a magnet, a rotor frame holding the magnet, and a housing holding the rotor frame are provided. And a bearing that rotatably supports the housing, a stator salient pole portion and a stator cylindrical portion disposed opposite to the outer periphery of the magnet, and a recess provided in a part of the stator cylindrical portion. With the configuration having the stator, a gap between the winding nozzle and the stator cylindrical portion can be secured, so that sufficient winding can be applied to the stator salient pole portion, and sufficient torque performance can be obtained. Obtainable.

According to another aspect of the present invention, there is provided a magnet, a rotor frame for holding the magnet, a housing for holding the rotor frame, a bearing for rotatably supporting the housing, and a bearing facing the outer periphery of the magnet. Having a stator salient pole portion and a stator cylindrical portion arranged, and providing a cut-and-raised portion in a part of the stator cylindrical portion, a crossover of a winding can be hooked on the cut-and-raised portion.
Since the influence of the crossover on the movable restriction range of the winding nozzle is negligible and sufficient winding can be applied to the stator salient pole portion, sufficient torque performance can be obtained.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view of an inner rotor type brushless motor of the present invention, FIG. 2 is a half sectional view of the same, FIG. 3 is a half plan view showing a winding state of the stator, and FIG. It is a half-plan view showing a continuous winding state. 1 and 2, 1
Denotes a stator cylindrical portion, 2 denotes a stator salient pole portion, 3 denotes a concave portion provided in the stator cylindrical portion 1, and 4 denotes a cut-and-raised portion provided in the stator cylindrical portion 1. Stator salient pole 2
Is formed integrally from a laminated electromagnetic steel plate and the like, and then a winding 6 is applied to the stator salient pole portion 2 via an insulating coating film 5 and fixed to a printed wiring board 7 by bonding or the like. ing. Reference numeral 8 denotes a fixed shaft, which is fixedly fastened to the printed wiring board 7 by caulking or the like, and a boss 10 is fixed to the upper portion by a screw 9 to hold the bearing 11. The magnet 12 is fixed to a rotor frame 13, and the rotor frame 13 is fixed to a housing 14 by press fitting or the like, and the housing 14 is rotatably supported by the bearing 11.

The operation of the inner rotor motor configured as described above will be described below. First,
A signal obtained by detecting a magnetic flux of driving magnetization (not shown) applied to the magnet 12 by a magnetic detection element (not shown) arranged between the stator salient poles 2 is subjected to arithmetic processing by a logic circuit. Then, the current distribution for driving the motor is determined as needed. Next, the coil is energized in accordance with the above-described current distribution to generate a magnetic field, attracting and repelling the magnet 12 and rotating the motor.

FIG. 3 shows the winding state of the stator.
1 is the above-described stator cylindrical portion, 2 is a stator salient pole portion, 3 is a concave portion provided in the stator cylindrical portion 1, 4 is a cut-and-raised portion provided in the stator cylindrical portion 1, 6 is a winding, Numeral 15 denotes a winding nozzle which turns the stator salient pole portion 2 sequentially by rotating around the stator salient pole portion 2. FIG. 4 is a view showing a case where the winding 6 is continuously applied to each stator salient pole portion in the above-described winding method. In addition to the stator cylindrical portion, the stator salient pole portion, and the winding, Crossover 16 for continuous winding
Has occurred. In addition, the presence of the concave portion 3 and / or the cut-and-raised portion 4 can prevent the winding nozzle 15 from contacting the stator cylindrical portion 1, and the connecting wire 16 can be arranged along the stator cylindrical portion 1. The winding 6 can be applied over the entire length of the salient pole portion 2.

[0017]

As described above, according to the present invention, a concave portion is provided in a stator cylindrical portion, or a part of the stator cylindrical portion is cut and raised, so that the contact between the tip of the winding nozzle and the stator cylindrical portion is reduced. Since the problem and the problem of the crossover of the winding can be solved and sufficient winding can be applied to the stator salient pole portion, an inexpensive and high-performance inner rotor motor can be obtained.

[Brief description of the drawings]

FIG. 1 is a plan view of an inner rotor motor according to an embodiment of the present invention.

FIG. 2 is a half sectional view of the inner rotor motor.

FIG. 3 is a half plan view showing a winding state of the stator.

FIG. 4 is a half plan view showing a continuous winding state of the stator.

FIG. 5 is a plan view of a conventional inner rotor motor.

FIG. 6 is a half sectional view of the inner rotor motor.

FIG. 7 is a half plan view showing a winding state of the stator.

FIG. 8 is a half plan view showing a continuous winding state of the stator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stator cylinder part 2 Stator salient pole part 3 Concave part 4 Cut-and-raised part 5 Insulation coating film 6 Winding 7 Printed wiring board 8 Fixed shaft 11 Bearing 12 Magnet 13 Rotor frame 14 Housing 15 Winding nozzle 16 Transition wire

Claims (2)

[Claims] 1. A magnet, a rotor frame for holding the magnet, a housing for holding the rotor frame, a bearing for rotatably supporting the housing, and a stator salient pole portion disposed opposite to the outer periphery of the magnet. An inner rotor motor having a stator having a stator cylindrical portion, wherein a recess is provided in a part of the stator cylindrical portion. 2. A magnet, a rotor frame for holding the magnet, a housing for holding the rotor frame, a bearing for rotatably supporting the housing, and a stator salient pole portion arranged to face the outer periphery of the magnet. An inner rotor motor having a stator, wherein the inner rotor motor has a stator cylindrical portion, and a cut-and-raised portion is provided in a part of the stator cylindrical portion.