JPH0528939Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a flat rotor type brushless motor, and particularly to one that increases torque relative to the size of the motor.

[Conventional technology]

A flat rotor type brushless motor is a flat rotor brushless motor in which a flat rotor is constructed by fixing a plurality of permanent magnets in an annular shape, and a stator is constructed by arranging a plurality of armature coils with iron cores corresponding to these permanent magnets. It is known from Utility Model Application No. 60-7682 and others.

[Problem that the invention attempts to solve]

However, in such conventional flat rotor type brushless motors, the flat rotor is fixed to the output output rotating shaft by press fitting, and the stator is also fixed to the holder by adhesive or the like. Therefore, there is a problem that the assembly work is difficult and the accuracy of the assembly position cannot be achieved.

Therefore, an object of the present invention is to facilitate assembly and improve the accuracy of the assembly position.

[Means for solving problems]

Therefore, in the present invention, a plurality of permanent magnets 12 are arranged and fixed in an annular shape on the surface of the annular ring 11 so that the magnetic pole directions are parallel to each other, and the rotor 10 is
A rotating shaft 14 is attached to the inner circumferential surface 13 of the annular ring 11 of the rotor 10, and an iron core 31 having a U-shaped cross section is attached to the outer circumference of the rotor 10. The facing surface in the letter-shaped recess and the permanent magnet 12 in the rotor 10 are arranged so as to face each other, and the iron core 31 is provided with a magnetic pole such that the magnetic pole of the iron core 31 is generated in a direction that coincides with the magnetic pole direction of the permanent magnet 12.
In a flat brushless motor in which an armature coil 32 is wound and a stator 30 is constituted by an iron core 31 and an armature coil 32, the stator 30 is sandwiched in the axial direction of the rotating shaft 14 around the stator 30. , annular holders 34 and 35 are provided, and the holders 34 and 3 at the ends of the holders 34 and 35
5, claws 34b, 35 extending in the axial direction of the rotating shaft 14 are provided at the end on the inner peripheral surface side and facing the iron core 31.
Furthermore, the claws 34b and 35b are provided with convex tip portions extending in the radial direction of the rotating shaft 14, and the rotating shaft 14 at the end of the iron core 31 having a U-shaped cross section is provided.
The opposing end portions are provided with claws 34b and 3 of the holders 34 and 35.
5b.

[Effect]

By the above-described means, the iron core 31 is held between the holders 34 and 35 in the axial direction of the rotating shaft 14, and is held by the convex claw members of the claws 34b and 35b formed on the holders 34 and 35. Then, the end of the iron core 31 on the side facing the rotating shaft 14 is hooked and fixed.

At this time, the end of the iron core 31 is held in a pinched state by the convex tip of the claw 34b and the main body of the holder 34, and the convex tip of the claw 35b and the main body of the holder 35 hold the end of the iron core 31. The ends of 31 are held in a pinched state.

Therefore, for the holder 34 and holder 35,
The iron core 31 is accurately positioned and fixed.

〔Example〕

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

1 to 10 show an embodiment of the present invention, FIG. 1 is a partially sectional side view, where 1
0 is a rotor, and 30 is a stator.

As shown in FIGS. 2 and 3, the rotor 10 is composed of a plurality of permanent magnets 12 arranged in an annular shape on both sides of an annular ring 11. It is fitted into grooves 11a formed on both sides to have approximately the same size as the permanent magnet 12, and is further fixed with an adhesive. In this way, each permanent magnet 12 has a ring 11
Since it is firmly fixed to the permanent magnet 1
2 will not easily come off from the groove 11a of the ring 11, and it is possible to perform processing to increase the flatness of the surface of the permanent magnet 12 while each permanent magnet 12 is fixed to the ring 11. 12
Even if strong torque is applied, it can withstand it. Furthermore, the permanent magnets 12 are arranged so that their magnetic pole directions are parallel to each other. Permanent magnets 1 are placed on both sides of the ring 11.
The two have the same magnetic polarity. Therefore, the two permanent magnets 12 on both sides function like one strong permanent magnet. Furthermore, the permanent magnets 12 adjacent to each other in the circumferential direction are arranged so that their polarities are opposite to each other.

On the other hand, a spline is formed on the inner circumferential surface 13 of the ring 11, and is adapted to fit into a spline formed on the outer circumferential surface of the rotating shaft 14 for output extraction.

The rotating shaft 14 is made of a cylindrical body, and by fitting another rotating shaft (not shown) to the inner peripheral surface of the rotating shaft 14, the rotational output of the motor can be extracted to the outside. In addition, as another method for extracting the rotational output, another rotational shaft (not shown) can be inserted therein by using the screw hole 20 formed at the front end (the left end in FIG. 1) of the rotational shaft 14. It can also be done fixedly.

On the outer circumferential surface of the rotating shaft 14, the bearing 21 and the collar 15 are sequentially fitted from the rear end of the rotating shaft 14, then the rotor 10 is fitted, and then the collar 16, the bearing 22, and the collar 17 are fitted,
Finally, each bearing 21, 22 and the rotor 10 can be fixed on the rotating shaft 14 by tightening the nut 18. Note that the bearing 21 is capable of receiving forces in both the thrust direction and the radial direction.
The other rotating shaft connected to the rotating shaft 14 does not require any bearings, and the driven body can be directly driven.

From both sides of the rotor 10 to the outer circumferential side, there is an iron core 31 formed in an annular shape with the permanent magnets 12 in between.As shown in FIGS. 1 and 4, the shape of the iron core 31 is as follows. The cross section taken by a plane including the axis of the rotating shaft 14 has a U-shape. As clearly shown in FIG. 4, a plurality of the iron cores 31 are arranged on the outer periphery of the rotor 10, and the opposing surfaces in the U-shaped recess of the iron core 31 and the permanent magnets 12 of the rotor 10 However, they are now facing each other. An armature coil 32 is wound around the outer peripheral side of each iron core 31.

Each iron core 31 constitutes the main part of the stator 30, and includes a front holder 34 and a rear holder 35.
It is held from both sides by the As clearly shown in FIGS. 5 and 6, and FIGS. 7 and 8, the front holder 34 and the rear holder 35 have protrusions 34 on their contact sides with the iron core 31.
a, 35a are formed respectively, and each protrusion 3
Each iron core 31 is fitted and positioned between 4a and between each protrusion 35a. Moreover, each protrusion 34a of the front holder 34 and the rear holder 35,
On the inner circumferential side of 35a, there are holders 34, 35 on the inner circumferential surface side at the ends of the iron core 31, and holders 34, 35.
Claws 34b and 3 are provided at the side ends opposite to 5, respectively.
5b is formed, and furthermore, claws 34b, 35b are formed.
is provided with a convex tip extending in the radial direction of the rotating shaft 14.

And, by those claws 34b and 35b,
Both ends of each core 31 are hooked so that a predetermined gap can be maintained between each core 31 and the permanent magnet 12 of the rotor 10.

Therefore, the front holder 34, the iron core 31, and the rear holder 35 are assembled on the rotating shaft 14 with the rotor 10 inserted therein and assembled together. Note that before assembling these assemblies onto the rotating shaft 14, the oil seal 24 is attached to the collar 15.
can be assembled on top. After the above assembly is completed, the bearing holder 37 is assembled to the front holder 34 from the front with bolts 37b, and the case 36 is placed over the front holder 34 to the outer circumferential side of the rear holder 35 and the rear of the rear holder 35, and the front A bolt 38 and a nut 39 pass through from the holder 34 to the case 36.
Assembled by.

An oil seal 23 is inserted between the bearing holder 37 and the rotating shaft 14, and the bearing holder 37 is provided with a grease injection port 37a. Further, as clearly shown in FIG. 4, FIG. 9, and FIG. 10, the case 36 has six lead wire through holes 36a drilled in its lower end, through which the armature coils are connected. 32 lead wires 32a are led to an external control circuit (not shown).

Therefore, by passing a phase-controlled current from the control circuit to each armature coil 32 via these lead wires 32a, magnetic flux is generated in each iron core 31, and the magnetic flux and the magnetic flux of each permanent magnet 12 are The two interact to generate rotational torque in the rotor 10. Therefore, the rotor 10 rotates together with the rotating shaft 14 through spline fitting.

With this configuration, the size of the portion of the iron core 31 that faces the permanent magnets 12 of the rotor 10 can be increased without being affected by the armature coil 32, reducing magnetic resistance and increasing torque. Can be made larger. Further, as described above, the flatness of the surface of the permanent magnets 12 of the rotor 10 is increased, and the rotor 10 can be easily assembled to the rotating shaft 14 by spline fitting, and furthermore, the front holder 34 and the rear holder Since the stator 30 is fixed to the front holder 34 and the rear holder 35 by the locking structure of the claws 34b, 35b of 35 and each iron core 31, the gap between each iron core 31 and the permanent magnet 12 is maintained accurately. The above-mentioned gap can be made extremely small, for example, about 0.1〓, and in this respect as well, magnetic resistance can be suppressed and torque can be increased.

Although a specific embodiment of the present invention has been described above, the present invention is not limited to this embodiment, and includes various embodiments within the scope of the claims for utility model registration. For example, two or more sets of rotors and stators may be provided in one motor.

[Effect of idea]

As described above, according to the present invention, the convex tip of the claw 34b and the main body of the holder 34 allow the iron core 31 to
One end of the is held in a pinched state, and the claw 3
Since the other end of the iron core 31 is held in a pinched state by the convex tip of the holder 35 and the convex tip of the holder 35,
The iron core 31 is accurately positioned and fixed. For this reason, the permanent magnet 12 of the rotor 10
The gap between the iron core 31 of the stator 30 and the iron core 31 of the stator 30 can be maintained accurately, and the gap can be set extremely small. As a result, since magnetic resistance can be suppressed, the torque of the motor can be increased.

[Brief explanation of the drawing]

1 to 10 show an embodiment of the present invention, in which FIG. 1 is a partially sectional side view, FIG. 2 is a front view of the rotor, and FIG. 3 is a cross-sectional view taken along the - line in FIG. 4
The figures are a sectional view taken along lines A-A and B-B in Fig. 1, Fig. 5 is a front view of the front holder, Fig. 6 is a sectional view taken along the - line in Fig. 5, and Fig. 7 is a front view of the rear holder. Figure 8 is a sectional view taken along the - line in Figure 7, Figure 9 is a front view of the case, and Figure 10 is a - line sectional view in Figure 9.
FIG. 10...Rotor, 12...Permanent magnet, 14...
Rotating shaft, 30... Stator, 31... Iron core, 32
...armature coil.

Claims (1)

[Claims for Utility Model Registration] A plurality of permanent magnets 12 on the annular ring 11 surface.
are arranged and fixed in an annular shape so that their magnetic pole directions are parallel to each other to form a rotor 10, and a rotating shaft 14 is attached to the inner circumferential surface 13 of an annular ring 11 in the rotor 10. An iron core 31 having a U-shaped cross section is arranged around the outer periphery of the rotor 10 such that the facing surface in the U-shaped recess of the iron core 31 and the permanent magnet 12 of the rotor 10 face each other. In order to cause the magnetic pole of the iron core 31 to occur in the direction that corresponds to the magnetic pole direction of the magnet 12,
In a flat brushless motor in which an armature coil 32 is wound and a stator 30 is constituted by an iron core 31 and an armature coil 32, the stator 30 is sandwiched in the axial direction of the rotating shaft 14 around the stator 30. , annular holders 34 and 35 are provided, and holders 34 and 3 at the ends of the holders 34 and 35 are provided.
5 At the inner peripheral surface side and at the end facing the iron core 31, claws 34b and 35 extending in the axial direction of the rotating shaft 14 are provided.
Further, the pawls 34b and 35b are provided with convex tip portions extending in the radial direction of the rotating shaft 14, and the rotating shaft 14 at the end of the iron core 31 having a U-shaped cross section is provided.
The opposite end is the claw 34b and 3 of the holder 34 and 35.
A flat brushless motor, characterized in that it is latched by 5b.