JPS6162355A - Manufacture of linear motor core and its device - Google Patents

Abstract

PURPOSE:To effectively hold the air gap accuracy at operating time constant by securing a bearing to contact with the reference surface of a base, and grinding the air gap side surface of the toothed end of a core. CONSTITUTION:The toothed end of a pectinated core 2 is directed outward at the hole 11d of a base 11, a movable bearing R is contacted fixedly with the reference surface F of the base 11, pressed and deformed by a force equivalent to the magnetic attraction force at actually operating time by a pressing machine 12 from the back surface of the core at opposite side to the toothed part of the core 2, and the toothed end is ground in this state. Thus, an air gap between the primary side core and the secondary side scale at operating time is maintained constant, and a linear motor can be stably operated.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method and apparatus for manufacturing a small linear electric motor core.

[Conventional technology]

FIG. 2 is a side view of a linear electric motor. Three primary comb-shaped iron cores 2 are installed on the plane of the secondary scale 1 through a gap g. By energizing the primary coil W, the secondary scale 1 Or, either one of the next-side iron cores 2 moves and runs, and bearings for running are installed at both ends of the above-mentioned iron core 2 as appropriate! Several X7s are installed.

[Problem that the invention seeks to solve]

By the way, the gap g between the secondary scale 1 and the primary iron core 2 in this type of small linear motor requires an accuracy of 40 to 50 μm, and although this is necessary for performance reasons, the iron core has lamination variations and the tip of the teeth. The gap side plane of the iron core is rough, and the magnetic attraction force during operation causes distortion in the iron core.

Furthermore, there is a radial clearance in the running bearing, which also acts on one side band due to magnetic attraction, which changes the clearance accuracy and adversely affects the performance. (Means to solve the problem [Operation] The present invention has been made to solve the above problem, and after installing running bearings at both ends of the iron core, it is fixed to a base so that the iron core is in the same state as when actually in operation. A force equivalent to the magnetic attraction force during operation is applied to the iron core in advance by a presser, and in this state, the gap side plane of the tip of the tooth of the iron core is ground to ensure that the air gap accuracy remains constant during actual operation. The purpose is to maintain the

〔Example〕

An embodiment of the invention will be described below with reference to FIG. 11
is the base of the device of the present invention, and the opening li of the O-shaped frame 11C is provided so that it can be fixed on the bed of a grinding machine (not shown).
A support frame 11a111b is fixedly provided on both sides of the opening, which has a reference surface F on which the running bearing R is brought into contact, with the tip of the tooth portion of the comb-shaped iron core 2 extending outward.

Reference numeral 12 denotes a pressing device, for example, a number of fluid pressure cylinders 12a, 12b, etc. are arranged in parallel at the bottom of the base 11, and pressure is applied from the back side of the iron core 2 as shown by the arrow to generate magnetic force during actual operation. It distorts by pressing it with a force equivalent to the suction force.

A grinding wheel 13 is rotated by a drive source of a grinding machine (not shown), is aligned with the opening 11d of the base 11, and grinds the tip end surface of the iron core tooth.

The core manufacturing bag opening according to the present invention has the above-mentioned configuration and the base 1
The tip of the teeth of the comb-shaped iron core 2 is directed outward in the opening lid of 1, and the running bearing R is fixed in contact with the base surface F of the base 11, and the side opposite to the teeth of the iron core is fixed. The iron core is pressed from the back side of the iron core by a pressing machine 12 with a force equivalent to the magnetic attraction force during actual operation, causing distortion, and in this state, the tooth tip plane is ground.

〔Effect of the invention〕

As mentioned above, the gap side plane of the core is ground by the core manufacturing method and device of the present invention, so the gap between the primary core and the secondary scale during actual operation is reliably kept constant, resulting in stable performance. A linear electric motor can be provided.

[Brief explanation of drawings]

FIG. 1 is a side view of the device according to the present invention and the iron core of a linear motor fixed thereto. FIG. 2 is a side view of the linear electric motor.

Claims (1)

[Claims] 1. After mounting running bearings on both ends of a comb-shaped laminated core having a plurality of teeth around which a motor coil is wound, the tips of the teeth of the core are placed on a base having an opening. The bearing is fixed so as to face outward from the opening of the base and in contact with the reference surface of the base, and a magnetic attraction force equivalent to the magnetic attraction force of the electric motor is applied from the back side opposite to the teeth of the iron core. A method for manufacturing a linear electric motor core in which the flat surface of the tip of the teeth of the core is ground by pressing with force. 2. A base having an opening that allows the tooth tip plane of the comb-shaped core to project outward, and having a reference surface that allows bearings attached to both ends of the core to abut on the same plane; and the core. A manufacturing device for linear electric motor cores, which consists of a tooth section and a pressing device that presses from the back of the core on the opposite side.