JPH02269461A - Hybrid type linear pulse motor - Google Patents

Abstract

PURPOSE:To facilitate machining of magnetic pole teeth and maintenance of precision thereof by providing a rolling member which supports a primary core and a secondary core movably with a very small and specified gap maintained between magnetic pole tooth surfaces opposing each other. CONSTITUTION:In the case when a magnetic pole tooth pitch of a primary core is made three times as large as the one of magnetic pole teeth of a secondary core, for instance, a primary core assembly 1 is made up of a pair of primary cores 3 and 4 opposing each other with a permanent magnet 2 held between, and these primary cores 3 and 4 have magnetic poles 3a, 3b and 4a, 4b respectively, while drive windings 5a to 5d are wound on the magnetic poles respectively. A secondary core 6 has two rows 6a, 6b of the secondary core teeth and is supported by a rolling member movably in the direction of rows 6a, 6b of the magnetic pole teeth of the secondary core, with a very small and specified gap maintained from the magnetic piles 3a, 3b and 4a, 4b of the primary core and in parallel thereto. According to this constitution, maintenance of machining precision in the magnetic pole tooth pitch, a tooth width, etc., is facilitated.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a linear pulse motor.

[Conventional technology]

Conventionally, the magnetic pole tooth pitch of this type of hybrid linear pulse motor has been arranged at a pitch four times the step pitch for both the primary core and the secondary core.

Figure 3 shows a conventional hybrid linear pulse motor.
FIG. 3 is a developed diagram showing the relationship between the number of secondary core magnetic poles and the number of secondary core magnetic poles.

[Problem to be solved by the invention]

The magnetic pole tooth pitch of the above-mentioned conventional hybrid linear pulse motor is set and arranged to be four times the step pitch, so as the demand for finer step pitch increases, it becomes difficult to process the magnetic pole teeth and maintain its accuracy. There is a drawback.

SUMMARY OF THE INVENTION An object of the present invention is to provide a hybrid linear pulse motor that eliminates the above-mentioned drawbacks and allows easy machining of magnetic pole teeth and maintenance of accuracy thereof.

[Means to solve the problem]

The hybrid linear pulse motor of the present invention includes a secondary core (or primary core) having magnetic pole teeth arranged at a pitch four times the step pitch; a pair of opposing primary cores (or secondary cores) having magnetic pole teeth arranged at an odd multiple of the pitch of the magnetic pole teeth of the cores;
a permanent magnet held between the pair of primary cores, a drive winding surrounded by each magnetic pole of the pair of primary cores, and a magnetic pole tooth surface that faces the primary core and secondary core. and a rolling member that movably supports the rollers while maintaining a small and constant gap.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a perspective view of an embodiment of the invention. In the embodiment shown in FIG. 1, the pitch of the magnetic pole teeth of the primary core is three times that of the magnetic pole teeth of the secondary core. The primary core assembly 1 consists of a pair of primary cores 3 and 4 facing each other with a permanent magnet 2 in between.
The primary cores 3 and 4 have magnetic poles 3a, 3b, 4a, and 4, respectively.
b, and each magnetic pole has drive windings 5a, 5b, 5
c, 5d are wound. In addition, the secondary core 6 has two
It has a secondary core magnetic pole tooth row 6a, 6b, a primary core magnetic pole 3a,
2 in parallel with 3b, 4a, and 4b with a slight and constant gap.
It is supported by a rolling member so as to be movable in the direction of the tooth rows of the next core magnetic pole tooth rows 6a and 6b.

Note that this rolling member is similar to that used in a normal hybrid linear pulse motor.

FIGS. 2(a) to 2(e) are developed views showing how the secondary core moves depending on the direction of the current flowing through the primary core magnetic pole and the drive winding. Excitation current i in the direction shown in Fig. 2 <a>
When flowing, the magnetic field caused by the permanent magnet 2 is strengthened in the secondary core magnetic pole 3a, and the magnetic field caused by the permanent magnet 2 in the secondary core magnetic pole 3b cancels each other out and decreases, and the magnetic field remains at the position shown in FIG. 2(a). In addition, the magnetic attraction forces are balanced in the other secondary core magnetic poles 4a and 4b. At this time, the number of secondary core magnetic pole teeth facing one primary core magnetic pole tooth is 3 secondary core magnetic poles.
2 in a, 1 in 3b, 4a.

In 4b, the relationship is 1.5.

By sequentially switching the excitation magnetic pole to Fig. 2(b), Fig. 2(C), and Fig. 2(d), one of the secondary core magnetic pole teeth
The secondary core 6 moves to the left at /4 pitch.

〔Effect of the invention〕

As explained above, in the present invention, even though the magnetic pole tooth pitch of the primary core is set to an odd multiple of the magnetic pole teeth of the secondary core,
The same step pitch as the conventional magnetic pole wave pitch can be achieved. In addition, the secondary core magnetic pole teeth of this type of linear pulse motor are often formed by cutting with a cutter, and by using the present invention, the thickness of the cutter teeth can be increased by an odd number. The mechanical strength of the waves increases and durability increases, and the heat dissipation during cutting also improves, so the cutting speed can be increased within the range allowed by the heat generation conditions, and the accuracy per magnetic pole is maintained. This has the effect of making it possible to obtain extremely high productivity, such as making it easier to use.

[Brief explanation of drawings]

FIG. 1 is a perspective view of one embodiment of the present invention, and FIGS. 2(a) to (
e) is a developed diagram showing the step pitch relationship between the primary core magnetic pole teeth and the secondary core magnetic pole teeth, and Fig. 3 shows the relationship between the primary core magnetic pole teeth and the secondary core magnetic pole waves of a conventional hybrid linear pulse motor. It is a development diagram showing the relationship. 1... Primary core assembly, 2... Permanent magnet, 3, 4...
・Primary core, 3a, 3b, 4a, 4b-primary core magnetic pole,
5 a , 5 b , 5 c , 5 d - drive winding, 6 - secondary core, 6 a, 6 b - secondary core magnetic pole tooth row, 7 - primary core.

Claims (1)

[Claims] In a hybrid linear pulse motor, a secondary core (or primary core) having magnetic pole teeth arranged at a pitch four times the step pitch, and a magnetic pole tooth pitch greater than 1 of the magnetic pole tooth pitch of the secondary core (or primary core) a pair of opposing primary cores (or secondary cores) having magnetic pole teeth arranged at a pitch of a large odd number; a permanent magnet held by the pair of primary cores; and a pair of primary cores. a driving winding surrounded by each magnetic pole; and a rolling member movably supporting the magnetic pole tooth surfaces facing the primary core and secondary core with a slight and constant gap. A hybrid linear pulse motor characterized by: