JPH02184254A - Brushless motor position detector holding device - Google Patents

Abstract

PURPOSE:To make adjustment after incorporation unnecessary by a method wherein a leg is inserted between the opening of the groove of a stator and an insulating paper at the opening side of the groove of stator windings to fix it to a core while a position detector is attached to the inner surface of a cylinder opposing radially by the projected part projecting from the axial end surface of the stator core of rotor magnets. CONSTITUTION:A leg 21a, having an insertable configuration, is inserted between the opening of the groove of a stator and an insulating paper 5, inserted into the opening side of the groove of stator windings 3, to fix it to a stator core 2 through resin. A position detector 20 is attached to a radially opposing surface at a projected part projected from the axial end face of the core 2 of a rotor magnet 6 while the detector 20, a holding device 21 for the detector, a printing substrate 22 and the like are incorporated into a frame 1. According to this method, adjustment after incorporation may be made unnecessary.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a position detector holding device for a brushless motor used in conveyor drives and various labor-saving devices.

2. Description of the Related Art A conventional position detector holding device for a brushless motor will be described below.

FIG. 4 shows a structural sectional view of a conventional position detector holding device for a brushless motor. In Fig. 4, 1 is the motor frame, 2 is the stator core shrink-fitted to the frame 1, 3 is the winding inserted into the stator groove, and 4 is between the bottom of the stator groove and the winding 3. Installed lower insulating paper, 5 is stator groove opening and winding, II! 3 is a wedge insulating paper installed between 3, 6 is a rotor magnet, 7 is a rotor shaft to which the rotor magnet is attached, 8 is a ball bearing that supports the rotor shaft 7, and 9 is a preload on the ball bearing 8. 10 is an annular sensor magnet, 11 is a boss to which sensor magnet 10 is attached,
It is fixed to the rotor shaft 7 with a screw 12. Further, 13 is a position detector provided facing the outer diameter surface of the sensor magnet 10, 14 is a sensor holder that holds the position detector 13,
15 is a printed circuit board on which the sensor holder 14 is attached, and 7 is a printed circuit board on which circuit components are mounted; 16 is a printed circuit board 1
5 and the frame 1, 17 is a screw for fixing the printed circuit board 15 to the frame 1 via the spacer 16, 18 is a position detector cover, and 19 is a screw for fixing the position detector cover 18 to the frame 1. It's a screw.

The operation of the conventional brushless motor position detector holding device configured as described above will be described below.

First, when the rotor magnet 6 and the rotor shaft 7 rotate, the boss 11 fixed to the rotor shaft 7 with a screw 12 rotates.
A sensor magnet 10 fixed to a boss 11 rotates in synchronization with the rotor magnet 6. The position detector 13 converts the amount of magnetic flux coming out from the sensor magnet 10 and reaching the position detector 13 into an electrical signal. The sensor magnet 10 is magnetized to have a number of poles corresponding to the number of poles of the motor, and as a result, the position detector 13 outputs an electric signal corresponding to the rotational position of the rotor magnet 6. The electrical signal output by the position detector 13 is amplified by an electronic circuit mounted on the printed circuit board 15 and becomes a reference signal for driving the motor.

Problems to be Solved by the Invention In a brushless motor, it is necessary to obtain a reference signal corresponding to the relative position of the rotor magnet 6 and the stator core 2. Positioning and precision in the circumferential direction between the core 2 and the stator core 2 and the frame 1 are required. However, in the above conventional configuration, it is difficult to achieve positional accuracy between the stator core 2 and the frame 1 because the fixing method is shrink fitting, and it is difficult to obtain a reference signal corresponding to the relative position. . For this reason, after assembly, the boss 11 and rotor shaft 7
Screw 12 while observing the output signal for the circumferential positional relationship of
This requires a large amount of man-hours. In addition, since the position detector 13 is arranged outside the frame 1, the position detector cover 18 is required, and there is a problem in that a large number of man-hours are required for mounting the cover 18 and tightening the screws of the printed circuit board 15. was.

The present invention solves the above-mentioned conventional problems, and provides a position detector holding device for a brushless motor that does not require adjustment after installation, does not require a sensor magnet, and requires less man-hours for installation. The purpose is to

Means for Solving the Problems In order to achieve this object, the brushless motor position detector holding device of the present invention includes a stator groove opening, an insulating paper inserted into the groove opening side of the stator winding, and a stator groove opening. A cylindrical cylinder having a foot shaped so that it can be inserted between the two, the foot being fixed to the stator core with resin, and facing radially to the portion of the rotor magnet that protrudes from the axial end surface of the stator core. A position detector is attached to the inner surface of the

Effect: With this configuration, the relative position of the position detector holding device and the stator core in the circumferential direction is determined by the stator groove and the foot, and as a result, the accuracy of the relative position of the position detector and the stator core can be determined without adjustment. In addition, since the position is detected by the magnetic flux of the rotor magnet instead of the sensor magnet, the sensor magnet is not needed. In addition, since the legs of the position detector holding device and the stator core are fixed at the same time when the windings are impregnated with resin, special man-hours for fixing are not required.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 shows a structural cross-section of a position detector holding device for a brushless motor according to an embodiment of the present invention, and FIG. 2 shows a cross-section in a direction perpendicular to the axis of a stator groove.

In FIG. 1, 20 is a position detector installed to face the rotor magnet 6 in the radial direction, 21 is a position detector holding device that holds the position detector 20, and 21a is the position detector holding device 21. A leg 22 has a shape that can be inserted between the stator groove opening and the insulating paper 5, and 22 is a printed circuit board attached to the side opposite to the stator of the position detector holding device 21, on which electronic components for position detection signal processing are mounted. has been done.

In addition, in FIG. 2, 23 is a position detector holding device 21.
This is a resin that fixes the legs 21a and the stator core. In addition,
In the figure, 1 is a frame, 2 is a stator core, 3 is a stator winding, 4 is an insulating paper, 7 is a rotor shaft, 8 is a ball bearing, and 9 is a wave washer, which are different from the conventional structure. It's the same thing.

FIG. 3 shows a position detector holding device 2 in an embodiment of the present invention.
1 is a perspective view of FIG. 1 illustrating the assembly procedure of a position detector 20, a printed circuit board 22, and a stator core 2. For clarity, the stator windings and insulating paper are omitted. As for the assembly procedure, first, the position detector 20 is attached to the position detector holding device 21, and then the printed circuit board 22 is attached.
is attached to the position detector holding device 21, and the lead wire 20a of the position detector 20 is soldered to the printed circuit board 22. Then, the leg 21a of the position detector holding device is inserted into the stator winding side of the stator groove opening of the stator in which the insulating paper has already been inserted and the stator winding has been applied, and then resin impregnation is performed.

The operation of the brushless motor position detector holding device of this embodiment configured as described above will be described below.

゛First, when the rotor magnet 6 rotates, the position detector 20 converts the amount of magnetic flux that comes out from the rotor magnet and reaches the position detector 1 into an electrical signal, and as a result corresponds to the rotational position plane of the rotor magnet 6. signal is output. This signal is amplified by an electronic circuit mounted on the printed circuit board 22 and becomes a reference signal for driving the motor.

Further, the position detector holding device 21 to which the position detector 20 is attached has a stator core 2 at its leg 21a.
Since the rotor magnet 6 is inserted and fixed into the stator groove, the relationship between the rotor magnet 6, the stator core 2, and the output signal is fixed, and no position adjustment is required after installation.

As described above, according to this embodiment, the foot 21a has a shape that can be inserted between the stator groove opening and the insulating paper 5 inserted into the groove opening side of the stator winding, The legs 21a are fixed to the stator core 2 with resin 23, and a mounting portion for the position detector 20 is provided on a surface of the rotor magnet 6 that is radially opposite to a portion of the rotor magnet 6 that protrudes from the axial end surface of the stator core 2. In addition, the position detector 20 and position detector holding device 21 are installed.
By incorporating the printed circuit board 22 and the like inside the frame 1, the relative position of the position detector holding device 21 and the stator core 2 in the circumferential direction is determined by the stator groove and the foot 21a, and as a result, the position detector 20 and the fixed position are determined. The accuracy of the relative position of the child core 2 can be determined without adjustment, and a sensor magnet is not required (the position is detected by the magnetic flux of the rotor magnet 6, so a sensor magnet is not required. Since the fixation between the legs 21a and the stator core 2 is achieved at the same time as the stator winding 3 is impregnated with the resin, special man-hours for fixation are not required.

In addition, since the position detector 20, the position detector holding device 21, etc. are built into the motor frame 1, the axial dimension of the entire motor can be shortened.

In this example, the position detector is the only detector attached to the position detector holding device, but a multi-pole magnetized sensor magnet is attached to the rotor shaft, and another magnetic sensor is attached to the position detector holding device. Needless to say, by attaching a detector, it can be provided with a (frequency generator) function. Further, although the position detector holding device and the like are installed on the side opposite to the output shaft of the motor, they may be installed on the output side.

Effects of the Invention According to the present invention, the relationship between the rotational positions of the stator core and rotor magnets is detected not only by a sensor magnet and a detector mounted outside (but also by a position detection retainer fixed to the stator core). Since detection is performed using the installed sensor and rotor magnet, it can be assembled with high precision during motor assembly, reducing the need for skill and a large amount of man-hours for post-assembly adjustments, improving productivity. can greatly contribute to

Furthermore, the position detector holding device of the present invention eliminates the need for an external sensor magnet, eliminates the need for assembling the magnet, and is also highly effective in providing a brushless motor with a shortened overall length.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of essential parts of a brushless motor position detector holding device according to an embodiment of the present invention, FIG. 2 is a sectional view perpendicular to the axis of the stator groove, and FIG. 3 is an assembled view. FIG. 4 is a sectional view of a main part of a conventional brushless morph position detector holding device. 1...Frame, 2...Stator core,
3... Stator winding, 6... Rotor magnet, 20... Position detector, 21... Position detector holding device body, 22... ·····Printed board. Name of agent: Patent attorney Shigetaka Awano and one other person.

Claims (2)

[Claims] (1) A position detector holding device main body that is disposed on the axial end face of the stator core and has a shape that allows insertion of parts of the rotor shaft and the rotor magnet that protrude in the axial direction from the end faces, and a position detector a position detector mounting portion disposed on a surface radially facing the rotor magnet of the holding device main body, a groove opening of a stator groove on the end surface side of the position sensor holding device main body, and the stator A brushless motor position detector holding device having one or more legs installed between a stator winding arranged in a groove and an insulating paper inserted into the opening side. (2) The brushless brushless according to claim 1, wherein the foot has a shape that fits into the shape of the winding side of the groove opening of the stator groove, and the foot and the stator core are fixed with resin. Motor position detector holding device.