JPH0686501A - Ac servomotor with integrated ball screw - Google Patents

Abstract

PURPOSE:To provide an AC servomotor with an integrated ball screw in which the polar position of a magnet is easily adjusted to a stator in the position of the mechanical origin of all nuts in the thread part of the ball screw shaft thereof. CONSTITUTION:A multipolar magnet 3 is arranged in the circumferential part, and a cylindrical rotor yoke 4 is inserted into the rotor yoke 4 installing part of a ball screw shaft 1 for fixation with clearance fit, thereby making it feasible to adjust the position of the rotor to the ball screw shaft 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotor of an AC servomotor used in various FA equipment.

[0002]

2. Description of the Related Art In recent years, AC servomotors have been widely used in production equipment. In recent years, a ball screw is connected to a motor output shaft, and a large nut on the ball screw is equipped with a jig for holding a work to be moved. Is being carried out.

FIG. 2 is a sectional view of a rotor of a ball screw integrated AC servo motor having the same structure as a conventional AC servo motor. Reference numeral 1 is a ball screw shaft, 1a is a screw portion of the ball screw shaft, 2 is a nut, and 3 is a magnet. One end of the ball screw shaft 1 is rotatably supported, the magnet 3 is fixed to a shaft to which the ball screw shaft 1 is extended, and the magnet 3 rotates in a motor (not shown).

[0004]

However, in the above conventional structure, since the ball screw shaft 1 is long, the pole position of the magnet 3 with respect to the stator is aligned with the mechanical origin position of all nuts 2 of the screw portion 1a of the ball screw shaft. Therefore, it is difficult to mount and magnetize the ball screw shaft 1. This is because the pole position of the magnet 3 is to be aligned in order to determine the phase to start in accordance with the mechanical origin of the nut 2.

The present invention solves the above problems.

[0006]

A rotor of an AC servomotor integrated with a ball screw according to the present invention has a cylindrical rotor yoke having magnets of a plurality of poles arranged on an outer peripheral portion thereof and a rotor yoke mounting portion of a ball screw shaft. It is equipped with a structure for inserting and fixing by mating.

[0007]

With the above construction, the pole positions of the magnets having a plurality of poles can be easily aligned and fixed at the mechanical origin positions of all nuts of the threaded portion of the ball screw shaft.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A ball screw integrated rotor according to an embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, a magnet 3 having a plurality of poles is mounted on the outer peripheral portion of a cylindrical rotor yoke 4, and the inner diameter of the rotor yoke 4 and the rotor yoke mounting portion 1b of the ball screw shaft.
However, it is inserted and fixed due to the clearance fit.

As described above, since the inner diameter of the cylindrical rotor yoke 4 on which the magnet 3 is mounted and the rotor yoke mounting portion 1b of the ball screw shaft are clearance fit, the magnet 3 is mounted on the cylindrical rotor yoke 4. Magnetization is performed on the plurality of poles in a state of being attached to, and at the mechanical origin position of all nuts 2 of the screw portion 1a of the ball screw shaft, the pole positions of the plurality of poles of the magnet 3 with respect to the stator can be inserted and fixed.

[0011]

As described above, the rotor of the ball screw integrated type AC servomotor of the present invention comprises a cylindrical rotor yoke having magnets of a plurality of poles arranged on the outer periphery thereof and a rotor yoke mounting portion of a ball screw shaft. It has a structure that it is inserted and fixed by clearance fitting, so that it can easily fix the pole positions of the magnets of multiple poles to the stator of the mechanical origin of all nuts of the screw part of the ball screw shaft. This is extremely advantageous.

[Brief description of drawings]

FIG. 1 shows a ball screw integrated type A according to an embodiment of the present invention.
C Servo motor rotor cross section

FIG. 2 is a cross-sectional view of a rotor of a ball screw integrated AC servo motor having the same configuration as a conventional AC servo motor.

[Explanation of symbols]

 1 ball screw shaft 1a screw part of ball screw shaft 1b rotor yoke mounting part of ball screw shaft 2 nut 3 magnet 4 rotor yoke

Claims (1)

[Claims] 1. A ball screw integrated type in which a magnet having a plurality of poles is arranged on an outer peripheral portion of a cylindrical rotor yoke, and the rotor yoke inner diameter and a rotor yoke mounting portion of a ball screw shaft are inserted and fixed by a clearance fit. AC servo motor.