Linear rotary motor

Patent metadata

Field	Value
Publication number	US-2025007377-A1
Application number	US-202118709519-A
Country	US
Kind code	A1
Filing date	Nov 26, 2021
Priority date	Nov 26, 2021
Publication date	Jan 2, 2025
Grant date	—

Abstract

A linear rotary motor includes: a frame; a stator including a linear motion coil and a rotation coil; and a mover including a shaft and a magnet, the shaft including an output shaft. The linear motion coil and the rotation coil is energized to cause the mover to move rectilinearly and rotate. A linear motion detector is disposed on the frame or the stator in such a way as to face the magnet, and detects a position of the mover in a linear motion direction. A linear motion scale is provided on an outer periphery of the mover, the linear motion scale being provided over a range of motion in the linear motion direction and a range of rotation in a circumferential direction so as to face the linear motion detector when the mover moves rectilinearly or rotates.

First claim

1 . A linear rotary motor including:
a frame including a cylindrical frame body; a stator including a linear motion coil and a rotation coil, the linear motion coil being disposed on an inner peripheral wall of the frame body, the linear motion coil generating a linearly moving magnetic field in a linear motion direction, the linear motion coil and the rotation coil being coaxially arranged, the rotation coil generating a rotating magnetic field in a rotation direction; and a mover including a shaft and a magnet, the shaft being supported by the frame in such a way as to be rectilinearly movable and rotatable, the shaft including an output shaft, the magnet being provided on an outer periphery of the shaft, the linear motion coil and the rotation coil being energized to cause the mover to move rectilinearly and rotate, the linear rotary motor comprising: a linear motion detector to detect a position of the mover in the linear motion direction, the linear motion detector being disposed on the frame or the stator in such a way as to face the magnet; and a linear motion scale provided on an outer periphery of the mover, the linear motion scale being provided over a range of motion in the linear motion direction and a range of rotation in a circumferential direction so as to face the linear motion detector when the mover moves rectilinearly or rotates, wherein the linear motion is separated into linear motion coils in the linear motion direction, and the rotation coil is separated into rotation coils in the linear motion direction, and the linear motion detector is disposed between the linear motion coils and between the rotation coils.

2 . A linear rotary motor including:
a frame including a cylindrical frame body; a stator including a linear motion coil and a rotation coil, the linear motion coil being disposed on an inner peripheral wall of the frame body, the linear motion coil generating a linearly moving magnetic field in a linear motion direction, the linear motion coil and the rotation coil being coaxially arranged, the rotation coil generating a rotating magnetic field in a rotation direction; and a mover including a shaft and a magnet, the shaft being supported by the frame in such a way as to be rectilinearly movable and rotatable, the shaft including an output shaft, the magnet being provided on an outer periphery of the shaft, the linear motion coil and the rotation coil being energized to cause the mover to move rectilinearly and rotate, the linear rotary motor comprising: a linear motion detector to detect a position of the mover in the linear motion direction, the linear motion detector being disposed on the frame or the stator in such a way as to face the magnet; and a linear motion scale provided on an outer periphery of the mover, the linear motion scale being provided over a range of motion in the linear motion direction and a range of rotation in a circumferential direction so as to face the linear motion detector when the mover moves rectilinearly or rotates, wherein the linear motion is separated into linear motion coils in the linear motion direction, and the rotation coil is separated into rotation coils in the linear motion direction, and the linear motion detector is disposed between the linear motion coils and between the rotation coils, the frame includes a first end plate, an intermediate plate, and a second end plate, the first end plate having a first linear motion rotation bearing provided thereon, the first linear motion rotation bearing supporting the output shaft such that the output shaft is rectilinearly movable and rotatable, the intermediate plate having a second linear motion rotation bearing provided thereon, the second linear motion rotation bearing supporting a shaft portion of the shaft such that the shaft portion is rectilinearly movable and rotatable, the shaft portion being on a side opposite to the output shaft, a hollow rotation scale attaching portion is fixed to the second linear motion rotation bearing, and a rotation scale is fixed to the rotation scale attaching portion, and a rotation detector is fixed to the second end plate, the rotation detector detecting a position of the mover in the rotation direction by reading the rotation scale.

3 . The linear rotary motor according to claim 2 , wherein
the linear motion detector is fixed to the inner peripheral wall of the frame body, and the linear motion scale is disposed on an outer periphery of the magnet.

4 . The linear rotary motor according to claim 2 , wherein
the linear motion detector is disposed on a surface of one of the linear motion coil and the rotation coil, the one of the linear motion coil and the rotation coil being disposed radially inside the other, and the linear motion scale is disposed on an outer periphery of the magnet.

5 . The linear rotary motor according to claim 2 , wherein
the rotation scale is hollow, and the shaft has, on the side opposite to the output shaft, an end exposed outside the second end plate.

6 . The linear rotary motor according to claim 1 , comprising:
a rotation detector to detect a position of the mover in the rotation direction, the rotation detector being disposed on the frame or the stator in such a way as to face the magnet; and a rotation scale provided on the outer periphery of the mover, the rotation scale being provided over the range of motion in the linear motion direction and the range of rotation in the circumferential direction so as to face the rotation detector when the mover moves rectilinearly or rotates.

7 . The linear rotary motor according to claim 6 , wherein
the linear motion detector and the rotation detector are fixed to the inner peripheral wall of the frame body, and are disposed in at least one of the linear motion coil and the rotation coil extending in the linear motion direction, and the linear motion scale and the rotation scale are disposed on an outer periphery of the magnet.

8 . A linear rotary motor including:
a frame including a cylindrical frame body; a stator including a linear motion coil and a rotation coil, the linear motion coil being disposed on an inner peripheral wall of the frame body, the linear motion coil generating a linearly moving magnetic field in a linear motion direction, the linear motion coil and the rotation coil being coaxially arranged, the rotation coil generating a rotating magnetic field in a rotation direction; and a mover including a shaft and a magnet, the shaft being supported by the frame in such a way as to be rectilinearly movable and rotatable, the shaft including an output shaft, the magnet being provided on an outer periphery of the shaft, the linear motion coil and the rotation coil being energized to cause the mover to move rectilinearly and rotate, the linear rotary motor comprising: a linear motion detector to detect a position of the mover in the linear motion direction, the linear motion detector being disposed on the frame or the stator in such a way as to face the magnet; and a linear motion scale provided on an outer periphery of the mover, the linear motion scale being provided over a range of motion in the linear motion direction and a range of rotation in a circumferential direction so as to face the linear motion detector when the mover moves rectilinearly or rotates, wherein the linear motion is separated into linear motion coils in the linear motion direction, and the rotation coil is separated into rotation coils in the linear motion direction, and the linear motion detector is disposed between the linear motion coils and between the rotation coils, a rotation scale is disposed on a surface of one of the linear motion coil and the rotation coil, the one of the linear motion coil and the rotat

Assignees

• Mitsubishi Electric Corp

Inventors

• Nakamura Yuichiro
• Sekiguchi Hiroyuki

Classifications

• H02K33/18

  with coil systems moving upon intermittent or reversed energisation thereof by interaction with a fixed field system, e.g. permanent magnets · CPC title

• H02K11/21

  Devices for sensing speed or position, or actuated thereby (specially adapted for machines having non-mechanical commutating devices H02K29/06, H02K29/14) · CPC title

• H02K7/06

  Means for converting reciprocating motion into rotary motion or vice versa · CPC title

• F16H25/16

  for interconverting rotary motion and oscillating motion · CPC title

• H02K41/03

  Synchronous motors; Motors moving step by step; Reluctance motors (H02K41/035 takes precedence) · CPC title