JPS61154453A - Reluctance dc motor - Google Patents

Abstract

PURPOSE:To eliminate an irregular torque, to improve the efficiency and to readily manufacture and assemble by forming integrally with a housing a strip as a reluctance stator provided on the inner periphery of a cylindrical housing, thereby reducing a reluctance. CONSTITUTION:When projections 2 are formed along the axial direction of a housing 1 on the inner periphery of a cylindrical housing 1 to be operated as a reluctance stator, the projections 2 are formed integrally with the housing 1. In order to integrally form the projections, they may be formed, for example, by pressing, or a thin plate formed integrally with the projections in advance may be laminated in the prescribed thickness to form the housing 1. When a coupling bolt for coupling a bearing plate is disposed in the recess formed on the back of the projection 2, it can be further compactly formed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a reluctance DC motor in which the resistance of a magnetic circuit passing through a reluctance stator and a yoke is reduced as much as possible.

(Prior art and its problems) As a conventional reluctance DC motor, for example, 198
The one described on page 12 of the magazine Mechatronics published in August 2010 is known.

As shown in FIG. 4, this reluctance DC motor has a protruding strip 2, which functions as a reluctance stator, fixed to the inner peripheral surface of a cylindrical housing 1, which functions as a yoke, with screws or adhesive. A cylindrical rotor 3 functioning as an armature core is rotatably supported within the rotor 1 via a rotating shaft 4, and an armature winding 5 is wound within the outer slot of the rotating shaft 4. The brushes 7.8 are brought into sliding contact with the commutator 6 fitted to the shaft end of the rotary shaft 4, thereby generating a rotational force on the rotary shaft 4 as shown by the arrow.

However, in such a conventional reluctance DC motor, the protruding strip 2, which functions as a reluctance stator, is attached to the inner circumferential surface of the housing 1 by adhesive or hissing, which makes the installation work troublesome. In addition, the mounting accuracy is poor, which causes uneven torque during rotation, and the minute gap at the joint surface between the protrusion 2 and the housing 1 increases magnetic resistance, reducing efficiency. I had to.

(Objective of the Invention) The object of the present invention is to eliminate torque unevenness in this type of reluctance DC motor and improve efficiency.
The object is to facilitate manufacturing and assembly and to reduce costs.

(Structure of the invention) In order to achieve the above object, this invention is implemented as a yoke)
In the reluctance DC motor, the reluctance DC motor has a cylindrical housing that functions as a reluctance stator, and a protrusion formed on the inner peripheral surface of the cylindrical housing to function as a reluctance stator, wherein the cylindrical housing and the protrusion are integrally formed. It is characterized by the fact that it becomes

(Description of Embodiment) FIGS. 1 and 2 are cross-sectional views of a reluctance DC motor according to a first embodiment of the present invention.

As shown in FIG. 1, the feature of the motor according to the first embodiment is that a cylindrical body is formed in advance using a plastic plate material with good magnetic permeability (such as a silicon steel plate), and the outer peripheral surface of this cylindrical body is , a cylindrical housing 1 which is press-formed at 90 degree intervals along the circumference toward the center of the cylinder as shown by the thick arrows in FIG. 1, thereby functioning as a yoke, and a reluctance stator. It is necessary that the protruding strip 2, which functions as

In particular, in this first embodiment, in order to tighten the bearing plates 1 to (shown in the figure) that close the openings at both ends of the housing, the grooves 9 are formed on the outer circumferential surface by press working.
Through holes] to 10 are accommodated, thereby making the entire motor more compact.

According to the above configuration, since the protrusions 2 protruding from the inner circumferential surface of the cylindrical housing 1 are formed by press J-notching, the caps between the rotor 3 and the protrusions 2 can be precisely attached. In addition to this, the positioning accuracy along the circumference is also good, which makes it possible to reduce torque unevenness during rotation.

In addition, since the housing 1 and the protrusion 2 are integrally molded using the same material, the magnetic resistance between them is extremely low compared to conventional examples where they are fixed with screws or adhesive. It is possible to improve the efficiency of the seed motor.

In addition, since the cylindrical material prepared in advance is pressed from the outer circumferential surface toward the center to form the convex strips 2 by press working, the pressed marks or concave strips remain, and the conventional outer periphery or cylindrical material is In addition to being lighter in weight compared to a similar type motor, if the through holes 10 for fixing the bearing plate, which closes both ends of the housing, are housed in the grooves as in the embodiment, the entire motor can be made more compact. You can also do it.

Next, FIG. 3 shows a second embodiment of the reluctance DC motor according to the present invention, and the features of this second embodiment are as follows.
A large number of ring pieces each having a protruding strip 11 that functions as a reluctance stator and a yoke 12 connecting these strips are formed by pressing a thin plate material (for example, a silicon steel plate) with good magnetic permeability into a metal plate. However, by laminating a large number of these with insulating layers interposed in between, a so-called laminated core is formed.

According to the second embodiment, it is possible to improve manufacturing accuracy and reduce eddy current loss, thereby increasing efficiency.

(Effects of the Invention) As is clear from the description of the embodiments above, according to the present invention, by integrally molding the cylindrical housing and the convex strip, the magnetic resistance between them is reduced, and the magnetic flux is increased. In this way, it is possible to improve the efficiency of the motor.

[Brief explanation of the drawing]

1 and 2 are cross-sectional views showing the structure of the first embodiment, and FIG. 3 is a perspective view showing the housing structure of the second embodiment.
FIG. 4 is a partially cutaway perspective view showing the configuration of a conventional reluctance DC motor. 1...Housing 2...Convex strip

Claims (1)

[Claims] (1) In a reluctance DC motor having a cylindrical housing that functions as a yoke, and a protrusion formed on the inner peripheral surface of the cylindrical housing to function as a reluctance stator; A reluctance DC motor characterized by being integrally molded with.