JPH0729732Y2 - Cylindrical brushless motor - Google Patents

Description

TECHNICAL FIELD The present invention relates to the structure of an inner rotor type cylindrical brushless motor driven by an IC.

2. Description of the Related Art In a cylindrical brushless motor, a plurality of coils formed by winding an insulated conductor is usually fixed by resin molding, and fixed by wire connection on a disc-shaped or ring-shaped substrate, or the coils are fixed by adhesion. Many are later connected to the board.

An example of a conventional cylindrical brushless motor will be described below with reference to the drawings.

FIG. 10 shows a sectional view of a conventional cylindrical brushless motor.

In FIG. 10, reference numeral 1 denotes a shaft, which is rotatably supported by a bearing 2 provided on a yoke 7 and a bearing 3 provided on a bracket 5. A permanent magnet rotor 9 having a plurality of pairs of magnetic poles is attached to the shaft 1. Reference numeral 8 denotes a plurality of coils resin-molded into a cylindrical shape, which are inserted into the ring-shaped cores 6 which are stacked to form a bracket 5.
It is fixed by sandwiching it.

Problems to be Solved by the Invention However, in the above-described configuration, it is difficult and costly to mold each coil with resin, and there is a problem that it is difficult to connect wires on the substrate and to mount the Hall element sensor. .

In consideration of the above-mentioned problems, the present invention has a coil connection, a fixing, and
An object of the present invention is to provide a cylindrical brushless motor capable of easily mounting a Hall element sensor.

Means for Solving the Problems Means 1 In order to achieve the above object, the present invention provides a stator coil and a flexible printed circuit in which a substantially rectangular coil bent in the circumferential direction is connected to a flexible printed circuit board by a printed wiring on a plane. The substrate is formed in a cylindrical shape, is opposed to the permanent magnet rotor, and is disposed on the inner circumference of the laminated core having a gap in the radial direction. Further, both ends or one end of the coil including the flexible printed circuit board is held by being inserted or press-fitted into the groove formed by the ring-shaped spacer and the core.

Means 2 A substantially quadrangular coil is connected to a flexible printed circuit board by a printed wiring on a plane to form a stator coil and the flexible printed circuit board in a polygonal shape so as to face the permanent magnet rotor and to have a laminated core having a gap in the radial direction. It is arranged on the inner circumference. Further, both ends or one end of the coil including the flexible printed circuit board is held by being inserted or press-fitted into the groove formed by the ring-shaped spacer and the core.

Means 3 A substantially rectangular coil bent in the circumferential direction and a wheel element sensor are connected on the plane of the flexible printed circuit board to form the stator coil and the flexible printed circuit board in a cylindrical shape, and face the permanent magnet rotor in the radial direction. It is arranged on the inner circumference of a laminated core having a gap.

Further, both ends or one end of the coil including the flexible printed circuit board is held by being inserted or pressed into a groove formed by the ring-shaped spacer and the core.

Action 1 A substantially rectangular coil bent in the circumferential direction can be connected on the plane of the flexible printed circuit board, and by forming this into a cylindrical shape, a circumferential brushless motor that can easily connect the coil and fix the coil is possible. Becomes

Action 2 By forming a substantially quadrangular coil on the plane of the flexible printed circuit board and forming it into a polygonal shape, a cylindrical brushless motor capable of easily connecting the coil and fixing the coil becomes possible.

Function 3 The present invention enables a cylindrical brushless motor that can easily connect and fix the coil and the Hall element sensor by connecting the substantially rectangular coil bent in the circumferential direction and the Hall element sensor on the plane to the flexible printed circuit board. Becomes

Embodiment Hereinafter, a cylindrical brushless motor according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view of a cylindrical brushless motor according to the first embodiment of the present invention, in which reference numeral 1 is a shaft and a yoke 7
Bearing 2 provided on the bracket 3 and bearing 3 provided on the bracket 5
It is rotatably supported by. A permanent magnet rotor 9 having 8 poles magnetized in the radial direction is attached to the shaft 1. 6 is a slotless laminated core having a hollow portion in the center, and 8 is a substantially rectangular coil bent in the circumferential direction. The lead wires are connected to the pattern of the flexible printed circuit board 10 and then wound into a cylindrical shape. The permanent magnet 9 has a gap in the radial direction and is arranged on the inner circumference of the slotless laminated core 6. A spacer 4 is made of a synthetic resin and positions the end surface of the coil 8 on a stepped portion.
Similarly, the bracket 5 is also provided with steps to position the opposite end surface of the coil. The outer diameters of both stages are made slightly larger than the outer diameter of the permanent magnet rotor 9 to prevent contact. A notch is provided on the outer peripheral portion of the bracket 5 in order to pull out the input terminal of the flexible printed circuit board 10. The laminated core 6 is sandwiched between the spacer 4 and the bracket 5, and a part of the end surface of the yoke 7 is caulked to be held in the yoke 7.

2 and 3 are a developed plan view of the flexible printed circuit board and the coil in the first embodiment of the present invention, and a perspective view of a coil wound around the flexible printed circuit board and fixed in a cylindrical shape. The coil is connected and fixed to the printed pattern of the flexible printed circuit board by a three-phase star connection as shown in FIG. 2 (b). The input terminal 13 has a total of four terminals, namely, three terminals at the beginning of winding of three phases and one terminal at a middle point in which the winding ends of three phases are common.

As described above, according to the present invention, the coil 8 is connected and fixed to the flexible printed board 10, and the coil 8 is wound to face the permanent magnet rotor 9 in the radial direction, and the slotless laminated core 6 having a gap is provided. The cylindrical brushless motor is obtained by disposing the cylindrical brushless motor on the inner circumference.

Embodiment 2 FIG. 4 is a sectional view of a cylindrical brushless motor according to a second embodiment of the present invention, in which reference numeral 1 is a shaft and a yoke 7
Bearing 2 provided on the bracket 3 and bearing 3 provided on the bracket 5
It is rotatably supported by. A permanent magnet rotor 9 having 8 poles magnetized in the radial direction is attached to the shaft 1. Reference numeral 6 is a slotless laminated core having a hollow portion in the center, and 8 is a coil of six substantially quadrangular coils that are connected to the pattern of the flexible printed circuit board 10 and then wound in a polygonal shape. It has a gap in the direction and is arranged on the inner circumference of the slotless laminated core 6.

4 is a spacer made of synthetic resin and has a coil 8 in a stepped portion.
Position the end face of. Similarly, the bracket 5 is also provided with steps to position the opposite end surface of the coil. The outer diameters of both stages are made slightly larger than the outer diameter of the permanent magnet rotor 9 to prevent contact. A notch is provided on the outer peripheral portion of the bracket 5 in order to pull out the input terminal of the flexible printed circuit board 10. The laminated core 6 is sandwiched between the spacer 4 and the bracket 5, and is held in the yoke 7 by caulking a part of the end surface of the yoke 7.

FIG. 5 and FIG. 6 are perspective views in which a flexible printed circuit board and a developed plane of a coil and a coil connected to the flexible printed circuit board are formed in a polygonal shape in Embodiment 2 of the present invention. The coil is connected and fixed to the flexible printed circuit board in three phases. The input terminal 13 has a total of 4 terminals, namely, 3 winding start terminals for 3 phases and 1 middle point terminal for common winding end of 3 phases.
It has a terminal configuration.

As described above, according to the present invention, the coil 8 is connected and fixed to the flexible printed board 10, and the coil 8 is wound to face the permanent magnet rotor 9 in the radial direction, and the slotless laminated core 6 having a gap is provided. The cylindrical brushless motor is obtained by disposing the cylindrical brushless motor on the inner circumference.

Third Embodiment FIG. 7 is a sectional view of a cylindrical brushless motor according to a third embodiment of the present invention, in which reference numeral 1 denotes a shaft and a yoke 7
Bearing 2 provided on the bracket 3 and bearing 3 provided on the bracket 5
It is rotatably supported by. A permanent magnet rotor 9 having 8 poles magnetized in the radial direction is attached to the shaft 1. 6 is a slotless laminated core having a hollow portion in the center, and 8 is a substantially rectangular coil bent in the circumferential direction, which is connected to the Hall element sensor 12 in the pattern of the flexible printed circuit board 10 and then wound into a cylindrical shape. The permanent magnet 9 has a gap in the radial direction and is disposed on the inner circumference of the slotless laminated core 6.

4 is a spacer made of synthetic resin and has a coil 8 in a stepped portion.
Position the end face of. Similarly, the bracket 5 is also provided with steps to position the opposite end surface of the coil. The outer diameters of both stages are made slightly larger than the outer diameter of the permanent magnet rotor 9 to prevent contact. A notch is provided on the outer peripheral portion of the bracket 5 in order to pull out the input terminal of the flexible printed circuit board 10. The laminated core 6 is sandwiched between the spacer 4 and the bracket 5, and is held in the yoke 7 by caulking a part of the end surface of the yoke 7.

FIG. 8 and FIG. 9 are perspective views in which the flexible printed circuit board, the coil and the Hall element sensor in the third embodiment of the present invention are developed, and the coil and the Hall element sensor connected to the flexible printed circuit board are rolled into a cylindrical shape. is there.
The coil is connected and fixed to the flexible printed circuit board in three phases. The input terminal 14 has a total of 11 terminals, including three winding start terminals of three phases and three Hall element sensor eight terminals.

As described above, according to the present invention, the flexible printed circuit board 10 is connected to the coil 8 and the Hall element sensor 12, and is made to face the permanent magnet rotor 9 in the radial direction, and the slotless laminated core 6 having a gap is formed. A cylindrical brushless motor is obtained by arranging it on the inner circumference.

Effect of the Invention Effect 1 As described in the first embodiment, according to the present invention, the substantially rectangular coil bent in the circumferential direction is connected to the flexible printed circuit board on a plane, and the flexible printed circuit board provided with the input terminals is formed on the cylindrical structure. By winding and arranging it on the inner circumference of the laminated core having a gap in the radial direction so as to face the permanent magnet rotor, a cylindrical brushless motor in which the wire connection and fixing of the coil are simple can be obtained.

Effect 2 As described in the second embodiment, the present invention has a permanent magnet rotor in which substantially rectangular coils are connected to a flexible printed circuit board on a plane and the flexible printed circuit board provided with input terminals is wound in a polygonal shape. By arranging the coil on the inner periphery of the laminated core having a gap in the radial direction so as to be opposed to the brushless motor, it is possible to obtain a brushless motor that is easy to connect and fix the coil.

Effect 3 According to the present invention, as described in the third embodiment, the substantially rectangular coil bent in the circumferential direction and the Hall element sensor are connected to the flexible printed circuit board on a plane, and the flexible printed circuit board provided with the input terminal is cylindrical. A cylindrical brushless motor in which the coil and the Hall element sensor are easily connected and fixed can be obtained by arranging the coil and the Hall element sensor on the inner circumference of the laminated core which is rounded up and faces the permanent magnet rotor and has a gap in the radial direction.

[Brief description of drawings]

FIG. 1 is a sectional view of a cylindrical brushless motor according to a first embodiment of the present invention, FIG. 2 is a development view after the coil according to the first embodiment is connected to a flexible printed board, and FIG. 3 is a flexible view of the coil according to the first embodiment. FIG. 4 is a cross-sectional view of the cylindrical brushless motor according to the second embodiment, FIG. 5 is a development view after the coil according to the second embodiment is connected to the flexible printed circuit board, FIG. 6 is a perspective view in which the coil according to the second embodiment is connected to a flexible printed circuit board and then wound in a polygonal shape. FIG. 7 is a sectional view of a cylindrical brushless motor according to the third embodiment. FIG. 9 is a development view after the coil and the Hall element sensor are connected to the flexible printed circuit board. FIG. After connection to Le PCB, perspective view wound into a cylindrical shape, FIG. 10 is a sectional view of a conventional cylindrical brushless motor. 1 ... Shaft, 2, 3 ... Bearing, 4 ... Spacer, 5 ...
... Bracket, 6 ... Core, 7 ... Yoke, 8 ... Coil, 9 ... Permanent magnet rotor, 10 ... Flexible printed circuit board, 11 ... Substrate, 12 ... Hall element sensor, 13,1
4 …… Input terminal.

Claims (3)

[Scope of utility model registration request] 1. A flexible printed circuit board having input terminals, comprising a substantially rectangular coil connected in the circumferential direction and connected to a flexible printed circuit board, wherein a fixed stator coil and a flexible printed circuit board are formed in a cylindrical shape, and the flexible printed circuit board is formed. To
The coil is placed on the inner circumference of a laminated core facing the permanent magnet rotor and has a gap in the radial direction, and both ends or one end of the coil including the flexible printed circuit board is formed of a ring spacer made of synthetic resin and the core. Cylindrical brushless motor inserted or pressed into the groove. 2. A substantially rectangular coil is connected on a flexible printed circuit board provided with an input terminal to form a fixed stator coil and a flexible printed circuit board in a polygonal prism shape, and the flexible printed circuit board is opposed to a permanent magnet rotor. And has a gap in the radial direction on the inner periphery of the laminated core, and inserts both end faces or one end face of the coil including the flexible printed circuit board into the groove formed by the ring spacer made of synthetic resin and the core, or Press-fitted cylindrical brushless motor. 3. A shaft, a bearing for rotatably supporting the shaft, a permanent magnet rotor having a plurality of pairs of magnetic poles arranged on the shaft, and facing the rotor with a gap in the radial direction, A fixed stator having a slotless laminated core having a hollow portion in the center, an input terminal, and a flexible printed board having a substantially rectangular coil bent in the circumferential direction and a Hall element sensor connected to each other A coil and a flexible printed circuit board are formed in a cylindrical shape, and the flexible printed circuit board is arranged on the inner circumference of the laminated core so as to face the permanent magnet rotor and maintain a gap in the radial direction. Cylindrical brush holder with both end faces or one end face inserted or press-fitted into a groove formed by a ring spacer made of synthetic resin and a core Motor.