JPH027270B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a 10-phase permanent magnet type stepping motor having a structure in which permanent magnets are disposed in an outer rotor in an opposing gap between a rotor and a stator.

[Conventional technology]

Conventionally, a hybrid 10-phase stepping motor manufactured by Berger of West Germany is well known as this type of motor. The front cross-sectional view is shown in the third figure.
It is shown in the figure. 1 is the rotor, 2 in the direction of the rotation axis 10
It is divided into two parts, and inductor teeth 11 are carved on the outer peripheral surface thereof. 2 is a stator, with magnetic poles 21 for each phase.
Ten pieces are formed facing each other with their positions shifted by 180 degrees, and an electromagnetic coil 24 is installed by winding the magnetic pole 21 in a slot 23 opened between the magnetic poles, and teeth are provided on the inner peripheral surface of the magnetic pole 21 facing the rotor 1. 22 is cut and formed.
This figure 3 is viewed from one side, and on the other side the rotor teeth are shifted by 1/2 pitch.

Another conventional example is a four-phase hybrid step motor shown in FIG. This has 8 slots and has a rotor with permanent magnets 12, a is a section A of c, b is a section B of c, and c is a side sectional view. represents the magnetic path of the permanent magnet.

In addition, the same reference numerals indicate the same or equivalent parts in all the plain faces.

[Problem that the invention seeks to solve]

However, these conventional examples have high material and processing costs, low performance, and cannot be made thin.
There are drawbacks that make it difficult to use.

Here, the present invention overcomes the difficulties of the conventional example, enables high performance and large capacity, and enables FA (factory automation).
Can be widely applied from business to OA (office automation)
The purpose is to provide a 10-phase permanent magnet type stepping motor.

[Means for solving problems]

The present invention consists of the following configuration.

The stator 2 has ten slots 23 arranged at equal pitches around the outer circumference of a cylindrical laminated core, and concentrated windings 5.
The phase winding 24 is wound, and a thin plate-shaped permanent magnet 25 is attached to the outer periphery of the stator core, and this permanent magnet 25 is magnetized into multiple poles with a constant magnetic pole pitch.

The rotor 1 has a disk shape and its outer periphery is bent into a cylindrical shape, and this cylindrical portion has grooves 13 cut at a constant pitch in the axial direction to form _teeth 12. During time _t , |P _n −N _t |=2 is established, and the cylindrical part is connected to the stator 2 through a constant gap.
A rotating shaft 10 facing the outer periphery and rotatably supported
sticks to.

[Effect]

Since there is a difference of |P _n ~N _t |=2 between the number of poles P _n of the permanent magnet 25 of the stator 2 and the number N _t of the teeth 12 of the rotor 1, the five-phase winding When the wire 24 is excited to generate a rotating magnetic field, the teeth 12 of the rotor 1 are guided by the rotating magnetic field and rotate, forming a 10-phase stepping motor.

〔Example〕

A structural diagram of an embodiment of the present invention is shown in FIG. 1, in which a is a front sectional view and b is a side sectional view.

The stator 2 has ten slots 23 arranged at equal pitches around the outer periphery of a cylindrical laminated core.
3 is provided with a concentrated winding 24 of five phases. By the way,
A 5-phase periodic machine can be used as a stepping motor with 10 phases.

Furthermore, a thin plate-shaped permanent magnet 25 is attached to the outer periphery of the stator core, and this permanent magnet 25 is magnetized into multiple poles with a constant magnetic pole pitch.

The rotor 1 has a disk shape, and its outer periphery is bent into a cylindrical shape, and this cylindrical portion has grooves 13 cut at a constant pitch in the direction of the axis 10 to form grooves 12.

Therefore _, the number of pole pairs P _n of the magnetic poles of the permanent magnet 25 of the stator 2 and the number _{N t} of the teeth 12 of the rotor 1 are selected so that there is a difference of 2. It has been done.

The rotor 1 has this cylindrical part separated by a certain gap,
It faces the outer periphery of the stator 2 and is fixed to a rotating shaft 10 supported by a bearing 27 rotatably supported by a housing 26 .

Now, the operation of the present invention will be explained.

Here, consider an example in which the number of pole pairs of the stator permanent magnet 25 is 48 and the number of rotor teeth is 50.

In this case, the difference is 2, so if the N pole of the magnet 25 coincides with the center of the tooth 12 at a certain location, then
Similarly, the N pole coincides with the center of the tooth at a location 180° away. At +90° and -90° apart, the north pole coincides with the center of the groove, so the south pole coincides with the center of the tooth.

As shown in FIG. 3, since magnetic flux flows from N to S, four poles of magnetic flux are generated.

When the rotor 1 rotates by one tooth pitch, the magnetic flux φ of these four poles rotates 180 degrees.

The winding 24 is wound in two sets, 1φ to 5φ and 1′φ to 5′φ, but 1φ to 5φ and 1′φ to 5′φ cover exactly the pole pairs of the magnetic flux of the four poles, that is, the two poles. Therefore, a five-phase winding is formed.

1φ and 1′φ, 2φ to 2′φ, ..., 5φ and 5′φ winding 24
If they are connected in series, it becomes a 5-phase synchronous motor.

As a 10-phase permanent magnet stepping motor,
As shown in Fig. 4, if the 5-phase winding 24 is connected to a star and bipolar 180° energization drive or 2/3 phase alternating excitation is performed, the step angle is 360/50 x 10 = 0.72 degrees and the resolution is 500 steps. / rotation is obtained.

Furthermore, there are the following means as other embodiments of the present invention.

The disc part of the rotor, except for the cylindrical part, is made of aluminum alloy to reduce inertia, as well as to reduce leakage magnetic flux generated from the coil end of the winding, thereby reducing inductance.

A printed circuit board is provided on the load side where there is no rotor disk (disk-shaped portion of the rotor 1), and a drive circuit, pulse distribution circuit, etc. are attached thereto. This is shown in FIG. 5 as a side sectional view of the main part.

The disk-shaped portion of the rotor 1 is used as a laminated plate to provide a damper effect. This reduces noise.

〔Effect of the invention〕

Thus, according to the present invention, it is possible to achieve a number of remarkable effects listed below, and it greatly contributes to the field concerned.

Since it is a 10-phase stepping motor, the self-starting frequency can be 2.5 times that of a 4-phase motor.

The number of steps/rotations can also be increased by 2.5 times.

Difficult to pull out.

Since the outer rotor has a large rotor diameter compared to the motor dimensions, it is possible to increase the torque and number of teeth.
Both output and resolution are large.

The accuracy of the stator is achieved by magnetizing it after assembly, so it is not necessary.

Cost can be reduced.

Winding can be automated.

Due to the rotor structure, inertia can be reduced. For example, the tooth width/tooth pitch is about 1/3.

Can be made into a flat motor.

Compact, high-output products can be made.

[Brief explanation of drawings]

1 is a front view and a side view showing a cross section of an embodiment of the present invention, FIG. 2 is a front sectional view of the main part, FIG. 3 is an operation diagram, FIG. 4 is a winding excitation diagram, and FIG.
The figure is a partial side sectional view of another embodiment of the present invention.
7 are explanatory diagrams of a conventional example. 1... Rotor, 2... Stator, 10... Rotating shaft, 11... Inductor tooth, 1
2, 25...Permanent magnet, 21...Magnetic pole, 22...
Stator tooth, 23...Slot, 24...Winding (coil), 26...Housing, 27...Bearing, 2
8...Printed circuit board, 41...DC power supply, 42...
...Slider, 43...Brush.

Claims (1)

[Scope of Claims] 1. The stator includes 10 slots arranged at equal pitches around the outer circumference of a cylindrical laminated core, means for winding concentrated winding five-phase windings in the slots, and a thin plate around the outer circumference of the laminated core. A rotor is provided with a permanent magnet that is magnetized and attached to multiple poles with a constant magnetic pole pitch, and the rotor has a disc shape with an outer circumference bent into a cylindrical shape to form a cylindrical part, and this cylindrical part is a means for cutting grooves at a constant pitch in the axial direction and carving teeth to establish |P _n −N _t |=2 between the number of pole pairs of the permanent magnet P _n teeth and the number N _t of the teeth; A 10-phase permanent magnet type stepping motor, comprising: a means for fixing a rotary shaft facing the outer periphery of a stator with a constant gap therebetween and fixed to a rotatably supported rotary shaft;