JPS61121760A - Commutatorless motor - Google Patents

Abstract

PURPOSE:To improve the positioning accuracy of a position detector by forming a recess on the winding shroud of a slot insulator, and disposing the detector therein. CONSTITUTION:A commutatorless motor has a slot insulator 11 integrally molded with a winding shroud 12 on a stator core 1. A winding is concentrated on the tees of the insulator 11, the leg of a Hall element is soldered to the prescribed position of a printed board, and a sensor of the Hall element is inserted to the recess 13 of the shroud 12. The printed board is secured to the projection of the insulator 11. In this case, the Hall element is positioned on the bottom 13a of the recess 13 in the thrust direction and at an angle on the periphery at the side 13b of the recess, and further prevented from overturning in the radial outward direction in the back 13c of the recess. Thus, it can be positioned in three directions to improve the positioning accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a commutatorless motor having a salient pole type stator core equipped with a rotor position detector.

Conventional Structures and Problems The conventional method for commutatorless motors is to include a rotor position detector to detect the commutation timing of the armature. Hall elements and Hall ICs are often used as rotor position detectors.

Regarding the mounting of the position detector, in the case of a flat type motor with a gap in the axial direction, which is used for audio equipment, etc., it can be fixed on the same plane as the armature winding, and there is no practical problem. However, in the case of a cylinder type motor having a radial gap as shown in FIG. 10, the method of fixing the rotor position detector greatly influences the structure of the motor.

The configuration of a conventional cylinder type commutatorless motor will be described below with reference to FIG. As shown in the figure, an armature winding 2 is installed on a stator core 1, and a rotor magnet 3 is installed inside the armature winding 2.
is fixed to a rotor yoke 4, and the rotor yoke 4 is further fixed to a shaft 5 and rotatably supported by a bearing 7 provided on a bracket 6. A Hall element 9 as a rotor position detector is fixed to the printed circuit board 8 to which the stator core IK is fixed, and electrical connections are made.

On the other hand, a position detection magnet 10 that provides a change in magnetic flux for operating the Hall element 9 is integrally fixed to the rotor magnet 3 with its magnetic pole facing the Hall element 9.

In the above configuration, the position of the rotor magnet 3 can be detected by the Hall element 9 sensing the magnetic pole of the position detection magnet 1o, and the position signal is transmitted to the drive circuit section to be connected to the armature winding. By controlling the timing of energization,
It is possible to rotate the motor.

However, in the past, the positioning of the magnetic flux sensing part was also done by fixing the 90 feet of the Hall element to the printed circuit board 8 by soldering, but since the 90 feet of the Hall element were thin and the foot pitch was small, accurate positioning was not possible. , the position of the magnetic flux sensing section varies from side to side, front to back, and even up and down, making it difficult to accurately detect the position of the rotor. Therefore, there is a possibility that the drive circuit section detects a commutation timing that is different from the originally required commutation timing, causing variations in the characteristics of each motor, and further causing deterioration of the characteristics and poor rotation.

In addition, as a conventional example of improving the positional accuracy of the Hall element, there is a method of using a Hall element positioning component molded from resin or the like. FIG. 7 shows an example in which the Hall element 9 is mounted on the Hall element positioning component 14. Further, FIGS. 8 and 9 show cross-sectional views of examples in which the Hall element positioning component 14 is fixed to the printed circuit board 8 and actually assembled. The disadvantages of using the Hall element positioning component 14 are shown below.

(1) In order to accurately detect the position of the rotor, the closer the Hall element 9 is to the rotor position detection magnet 10, the better. However, if the Hall element positioning component 14 is used, the Hall element positioning component 14 will come into contact with the wall on the inner diameter side of the shroud portion of the slot insulator 11. Therefore, in order to solve the above problem, considering that the winding shroud part cannot escape to the outer diameter side, the Hall element positioning part 14
Either to shift it toward the inner diameter side or to shift it in the thrust direction.

The former is shown in FIG. 8, and the latter is shown in FIG. As can be seen from FIG. 8, if the Hall element position is shifted to the inner diameter side, it is necessary to widen the gap between the stator core 1 and the rotor magnet 3. Therefore, the amount of magnetic flux received by the stator core 1 from the rotor magnet 3 decreases, leading to deterioration of the motor characteristics.

FIG. 9 shows an example in which the Hall element positioning component 14 is placed above the wall of the winding shroud portion of the slot insulator. Since the position of the Hall element 9 is shifted from the end face of the stator core, it is necessary to make the rotor position detection magnet 10 longer in the thrust direction or to install a spacer between the rotor magnet 3 and the rotor position detection magnet 10. It is necessary to make the rotor position detecting magnet face the magnetic flux sensing portion of the Hall element 9 at a certain angle. Therefore, the dimensions of the motor itself in the thrust direction become larger, and the cost also increases.

(2) The Hall element positioning component 14 is attached to the printed circuit board 8.
It is necessary to make a hole for installation in order to fix it. Therefore, the wiring of the printed circuit board 8 is restricted.

(3) Due to an increase in the number of parts, the cost will be increased.

(4) The number of man-hours for mounting the Hall element 9 on the Hall element positioning component 14 and fixing the component to the printed circuit board increases, resulting in a cost store knob.Objective of the Invention The present invention has been made in view of the above-mentioned conventional problems. what has been done,
The present invention aims to provide a commutatorless motor that improves the positioning accuracy of a rotor magnet position detector and maintains an efficient operating state.

Structure of the Invention The present invention provides a slot and throat insulator in which a winding shroud is integrally molded, and a recess is formed on the side facing the rotor magnet of the winding shroud portion, and a position detecting element (Hall element) is positioned in this recess. This improves the positional accuracy of the rotor position detector.

DESCRIPTION OF EMBODIMENTS As an embodiment of the present invention, an adductor-type commutatorless motor including a slot insulator with a winding shroud formed into a body and having a Hall element as a rotor position detector will be described. FIG. 1 shows a sectional view of the commutatorless motor of the above embodiment. FIG. 2 shows a perspective view of the stator core 1 when the slot insulator 11 with the winding shroud portion 12 integrally formed thereon is attached.

In this embodiment, a slot insulator 11 is attached to a stator core 1, and a winding 2 is wound around the teeth of the slot insulator 11 by concentrated winding.

The foot portion of the Hall element 9 is fixed by soldering to a predetermined position of the printed circuit board 8 on which electrical wiring is applied.
The sensing portion is inserted into the recess 13 of the winding round portion 12. The printed circuit board 8 has a mounting hole and is configured to be fixed using a projection (not shown) provided on the slot insulator 11. The Hall element 9 is located at the bottom surface 13a of the recess 13 provided in the winding shroud portion 12.
positioning in the thrust direction is possible. In addition, angular positioning on the circumference of the Hall element 9 on the side surface 13b of the recessed portion,
The recessed rear surface 13c prevents the Hall element from falling in the outer diameter direction. As described above, a stator for a commutatorless motor is obtained in which the Hall element 9 can be positioned in three directions: the thrust direction, the radial direction, and the angle in the outer circumferential direction using the concave portion 13 provided in the winding tube portion 12.

FIG. 5 shows another embodiment of the present invention, in which the winding shroud 12 is provided with a parent control 2a in order to restrict the Hall element 9 to the inner diameter side.

In the configuration shown in FIG. 1, the stator portion is integrally molded from synthetic resin.

Further, the slot insulator 11 made of electrically insulating resin may be integrally molded with the stator core 1.

DETAILED DESCRIPTION OF THE INVENTION As described above, the present invention provides a concave portion of appropriate dimensions on the side of the winding shroud portion of a slot insulator opposite to the rotor position detecting magnet, and positions a position detecting element (Hall element) in this concave portion. As a result, the following effects can be obtained.

(1) Insert the Hehole element into the recess provided in the winding 7 round, the side surface of the recess in the circumferential direction, the bottom surface in the thrust direction,
The outer diameter direction can be controlled on the back surface, improving the positional accuracy of the Hall element.

(2) Due to the above effects, it is possible to obtain a Hall output voltage that produces an accurate commutation timing signal, maintain normal operation, and reduce variations in characteristics of individual motors.

(3) Even if the distance between the inner diameter side wall of the winding/niroud and the inner diameter of the stator core is narrow, by providing a recess, the Hall element can be stored with an appropriate gap between the rotor position detection magnet and the stator core. The air gap between the child magnets can be made smaller.

(4) Due to the above effect, expansion of the motor in the thrust direction can be avoided.

(6) Hall element positioning parts can be omitted. Accordingly, the man-hours for attaching the Hall element to the Hall-element positioning part, the fixing of the part to the printed circuit board, and the man-hours for managing the part can be omitted, resulting in cost reduction.

In addition, although the case where a Hall element was used as a rotor position detector was described above, the same effect can be obtained with other detectors such as a Hall ICMR element. Further, similar effects can be obtained not only with the inner rotor type motor described in this embodiment but also with the outer rotor type motor.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a non-commutator motor showing an embodiment of the present invention, Fig. 2 is a perspective view of a slot/nodoin 7 inverter used in the motor, and Fig. 3 is a hall element attachment of the inverter. 4 is a sectional view taken along the line A-A in FIG. 3, and FIG. 5 is a sectional view of a stator showing another embodiment of the present invention.
Fig. 6 is a perspective view of the same winding/Niroud, Fig. 7 is a perspective view showing the state in which the Hall element is attached to the Hall element positioning part, and Figs. 8 and 9 are the case where the Hall element positioning part is used. A sectional view of the stator, FIG. 10, is a sectional view of a conventional example. 1...Stator core, 2-...Winding, 3...Rotor magnet, 9...Hall element, 10...Position detection magnet, 11...Slot insulator, 12...
. . . Winding shroud portion, 13 . . . Recessed portion. Name of agent: Patent attorney Toshio Nakao and 1 other person
Figure 3 C Figure 5 Figure 6 f2 U Figure 7 Figure 8 Figure 1 O

Claims (1)

[Claims] a stator core provided with a slot insulator integrally molded with a winding shroud made of electrically insulating resin; a winding wound around the stator core via the slot insulator; a rotor having a rotor magnet provided therein; and a position detector for detecting the position of the rotor; a recess is provided in the winding shroud portion of the slot insulator on the side facing the rotating magnet; A commutatorless motor with a sensing element located.