Title:
ROTARY DRIVE DEVICE
Document Type and Number:
Japanese Patent JP2020048256
Kind Code:
A
Abstract:
To provide a compact and performance-improved rotary drive device capable of reducing variations in a preload to be applied between positions with respect to a circumferential direction of a bearing.SOLUTION: A rotary drive device 100 comprises a motor unit 12 and a bearing 3. The motor unit 12 includes a stator 1 and a rotor 2. The bearing 3 supports the rotor 2 rotatably with respect to the stator 1. The stator 1 includes a wound coil 1C. The rotor 2 includes a stationary magnet 2B for rotating the rotor 2. A first permanent magnet 101 is provided in the stator 1. A second permanent magnet 102 is provided in the rotor 2. The second permanent magnet 102 is configured to apply a preload to the bearing 3 by exerting a repulsive force with the first permanent magnet 101. The coil 1C is disposed between the first and second permanent magnets 101 and 102 and the stationary coil 2B.SELECTED DRAWING: Figure 1
Inventors:
YAMADA HIROYUKI
SUGIURA AKIRA
SUGIURA AKIRA
Application Number:
JP2018172551A
Publication Date:
March 26, 2020
Filing Date:
September 14, 2018
Export Citation:
Assignee:
NTN TOYO BEARING CO LTD
International Classes:
H02K21/22; F16C25/08; H02K5/16; H02K5/173
Domestic Patent References:
| JPH0222063U | 1990-02-14 | |||
| JPH06311702A | 1994-11-04 | |||
| JP2008151032A | 2008-07-03 | |||
| JPH0397373U | 1991-10-07 |
Attorney, Agent or Firm:
Fukami patent office