JPH099606A - Core for linear pulse motor - Google Patents

Abstract

PURPOSE: To provide a core, for a linear pulse motor, which is not subjected to the influence of the dimensional accuracy of a permanent magnet and which can realize a precise tooth pitch. CONSTITUTION: A core for a linear pulse motor is provided with cores, for respective phases, in which teeth 2 are formed at a prescribed pitch on the surface of both leg parts of U-shaped cores, with coils 5A, 5B, for the respective phases, in which the cores are laminated and which are wound on their trunk parts and with a magnet 7 between the cores for the respective phases. The core is formed as a core 1 of one sheet, and the cores 1A, 1B for the respective phases, a joint part 8 formed between the cores 1A, 1B for the respective phases and a magnet insertion groove 6 whose width is wider than the width of the magnet 7 formed at the joint part 8 are punched in the core 1.

Description

Detailed Description of the Invention

[0101]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a core of a linear pulse motor.

[0092]

2. Description of the Related Art As a conventional technique, a two-phase laminated core in which teeth are provided on a surface of both legs of a U-shaped core at a predetermined pitch, and two cores are wound around a body of the laminated core. There is a linear pulse motor in which a permanent magnet is sandwiched and bonded between a phase coil and a two-phase core (for example, Japanese Laid-Open Patent Publication No. 62-
77052).

[0093]

However, in the prior art, the cores for each phase are formed separately, and the permanent magnets are sandwiched and bonded between the cores. Therefore, the tooth accuracy depends on the dimensional accuracy of the permanent magnets and the film thickness of the adhesive. Since the pitch accuracy is determined, the dimensional accuracy of the permanent magnet and the accuracy of the film thickness of the adhesive directly affect the feed accuracy. Therefore, an object of the present invention is to provide a core of a linear pulse motor that can realize a highly accurate tooth pitch without being affected by the dimensional accuracy of the permanent magnet and the accuracy of the film thickness of the adhesive.

In order to solve the above-mentioned problems, a core for each phase in which teeth 2 are provided on the surfaces of both legs of a U-shaped core at a predetermined pitch, and this core are laminated to form a cylinder In the core of the linear pulse motor having the coils 5A and 5B for each phase wound around the part and the magnet 7 between the cores for each phase, the core is a single core 1 and The cores 1A, 1B, the joint 8 provided between the phase cores 1A, 1B, and the magnet insertion groove 6 having a width wider than that of the magnet 7 formed in the joint 8 are punched with one stamp.

[0056]

By the above means, the teeth 2 are integrally formed on the core at a predetermined pitch, and the magnet insertion groove 6 absorbs the tolerance of the width of the permanent magnet 7 and the thickness of the adhesive.

[0086]

Embodiment An embodiment of the present invention will be described below with reference to FIG. In the core 1 made of a rectangular ferromagnetic material, a U-shaped core 1A for A phase, a magnet insertion groove 6 having a width Y and a U-shaped core 1B for B phase are stamped with one stamp. When the pitch of the teeth 2 is p and the width of the teeth 2 is tp, the core 1A for the A phase and the core 1B for the B phase have a width (p-
tp), the tooth groove 3 having the width X, the tooth groove 3 having the width (p-tp), are provided in this order. Core 1 of magnet insertion groove 6
An extremely thin joint 8 is left uncut on the back surface of the. Here, the width Y of the magnet insertion groove 6 is made wider than the width B of the magnet 7 so as to absorb the tolerance of the width dimension of the magnet 7 and the film thickness of the adhesive. However, m and n are
When m> n is an integer, X and Y satisfy the following equations. X = (n-1 / 2) * p-tp (1) Y = (m-n-5 / 4) -tp, and Y> B (2) Attach to the magnet insertion groove 6 in the arrangement direction of the teeth 2. The magnetized magnet 7 is inserted and fixed with an adhesive or the like. After that, the A-phase coils 5A and B are placed on the body of the core above the coil grooves 4 and 4.
The phase coil 5B is toroidally wound. When there are three or more phases, p, X and Y are determined so that the tooth pitch produces a phase difference corresponding to the number of phases, and the core 1 for B phase of the embodiment is used.
A U-shaped core 1C for each phase provided with a magnet insertion groove 6, a tooth groove 3, a coil groove 4, and a tooth groove 3 in succession to B.
• should be provided.

The above-mentioned structure has the following effects. (1) Since the teeth, the coil groove, and the magnet insertion groove are integrally formed on the core with one stamp, the teeth can be arranged with a high pitch accuracy. (2) The width of the magnet insertion groove is made wider than the width of the magnet to absorb the tolerance of the width dimension of the magnet and the film thickness of the adhesive, so that it is not necessary to adjust the tooth pitch, which facilitates the production and improves the yield. To do.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

[Explanation of symbols]

 1 Core 1A A Phase Core 1B B Phase Core 2 Tooth 3 Tooth Groove 4 Coil Groove 5A A Phase Coil 5B B Phase Coil 6 Magnet Insertion Groove 7 Magnet 8 Joint

Claims (1)

[Claims] 1. A core for each phase in which teeth are provided on the surfaces of both leg portions of a U-shaped core at a predetermined pitch, and a coil for each phase which is obtained by stacking the cores and winding the core around the core. In a core of a linear pulse motor having a magnet between cores for each phase, the core is a single plate, a core for each phase, and a joint portion provided between the cores for each phase, A core of a linear pulse motor, wherein a magnet insertion groove having a width wider than the width of the magnet formed in the joint portion is punched out.