JPS603645Y2 - DC machine stator - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a stator configuration for obtaining a DC machine that can be configured to be small and lightweight and has good servo characteristics relative to the weight of the motor.

In a conventional DC machine, a large number of magnetic poles surrounding a rotor are arranged radially, and an annular yoke is provided integrally with these magnetic pole cores.

Therefore, although the stator core itself has sufficient strength, it is heavy, and has the drawback of a low weight-to-servo characteristic ratio.

This idea reduces the weight of the stator core as much as possible and connects the magnetic pole pieces to each other to eliminate sudden changes in the air gap magnetic flux and improve servo characteristics. An example of this is shown in Figure 1. There is.

Reference numeral 1 denotes several magnetic poles (four in the figure) at the corners, both ends of the magnetic pole piece 1a are connected to each other by connecting parts 2, two adjacent magnetic poles are paired, and a multi-pair magnetic pole body 1b is formed. are arranged in parallel with an interval for winding the field wire ring 3.

4 is a yoke that connects the magnetic pole bodies for each pair, 5 is a rotor, and 6 is a coil holding piece.

Note that the upper magnetic pole pair and the lower magnetic pole pair are supported by an outer frame (not shown), such as a bracket.

In this way, the two adjacent magnetic poles 1 and 1 are paired, their magnetic pole bodies 1b are made parallel with a distance sufficient to wrap around the field wire ring 3, and the magnetic pole bodies are connected to each other in multiple pairs. Since the yoke 4 is provided, in the embodiment shown in the figure, four magnetic poles form two pairs, and are excited to two or four poles depending on the winding direction of the field wire ring 3, forming a pair. The yoke between the magnetic pole and the other pair of magnetic poles is not required, and the yoke that connects the magnetic poles of each pair is parallel to each other, so the field wire ring 3
They can be short enough to accommodate the spacing required for the space.
The weight of the yoke can be significantly reduced.

In addition, since the magnetic pole pieces 1a of each magnetic pole 1 are connected to each other by the narrow connecting portion 2, the opposing air gap with the rotor 5 can be precisely maintained, and the air gap magnetic flux at the intermediate portion between the magnetic pole pieces can be maintained precisely. It is possible to eliminate sudden changes and reduce cogging torque, and the overall design is small and lightweight, greatly improving the weight-to-body servo performance ratio.

In addition, as in the embodiment shown in FIG. 2, the magnetic pole surfaces are arranged so that the air gap facing the rotor 5 is narrowest at the center of each magnetic pole piece 1a and gradually widens toward the connecting portion 2 between the magnetic poles. If this is done, the rectified coil will not be overlaid with magnetic flux at the neutral point between the magnetic poles, and the rectification characteristics can be further improved.

In this way, the present invention has several magnetic poles surrounding the rotor and connecting adjacent magnetic pole pieces with thin connecting parts, and pairs two adjacent magnetic poles so that they become the magnetic pole body force-calling side. Since each pair is equipped with a yoke that connects the parallel magnetic pole bodies, and the yoke between each pair is eliminated, it is possible to obtain a compact, lightweight DC machine with good servo performance. It is characterized by precise air gap retention and low cogging torque.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a main part showing an embodiment of the present invention, and FIG. 2 is a partial cross-sectional view of another embodiment. 1 is a magnetic pole, 1a is a magnetic pole piece, 1b is a magnetic pole body, 2 is a connecting part,
3 is a field wire ring, 4 is a yoke, and 5 is a rotor.

Claims (1)

[Scope of utility model registration request] The rotor is surrounded by an opposing air gap, and adjacent magnetic pole pieces are provided with several magnetic poles connected by thin connecting parts.
A DC machine in which the magnetic pole bodies are configured in parallel with each other in pairs, and each pair is equipped with a yoke that connects the parallel magnetic pole bodies, and a field wire wound around each magnetic pole body. stator.