Stator structure of motor

• US 6,285,107 B1
• Filed: 05/04/2000
• Issued: 09/04/2001
• Est. Priority Date: 05/17/1999
• Status: Expired due to Term

• Current Assignee: Fanuc Ltd (Fanuc Corporation)
• Original Assignee: Fanuc Ltd (Fanuc Corporation)
• Inventors: Kawai, Tomohiko, Sawada, Kiyoshi
• Primary Examiner(s): Ramirez, Nestor
• Assistant Examiner(s): Lam, Thanh
• Application Number:
  US09/564,684
• Time in Patent Office: 488 Days
• Field of Search: 310/254, 310/259, 310/179, 310/194, 310/164, 310/258, 310/67.R
• US Class Current: 310/216.001
• CPC Class Codes: H02K 11/014 Shields associated with stationary parts, e.g. stator cores
• CPC Class Codes: H02K 11/40 Structural association with grounding devices
• CPC Class Codes: H02K 2211/03 Machines characterised by circuit boards, e.g. pcb
• CPC Class Codes: H02K 3/46 Fastening of windings on the stator or rotor structure

Abstract

A stator structure for a motor of high precision by suppressing influence of electromagnetic noise between windings and a distribution pattern layer in a printed board. A shield is provided between the windings and the distribution pattern layer of the printed board to shield the electromagnetic noise and suppress the influence of the electromagnetic noise to thereby enable precise control of the motor. A multilayered printed board is arranged on an axial end face of the stator core and the windings are formed around the stator core and the multilayered printed board to enfold them toroidally in a regular winding manner. The multilayered printed board comprises a distribution pattern layer for connection with the windings and a shield layer for shielding electromagnetism between the distribution pattern layer and the windings.

Claims

1. A stator structure of a motor comprising:

a stator core;

a multilayered printed board arranged on an axial end face of said stator core; and

windings formed around said stator core and said multilayered printed board toroidally in a regular winding manner to enfold said stator core and said multilayered printed board,

wherein said multilayered printed board includes a distribution pattern layer to interconnect said windings, and a shield to shield electromagnetism between said distribution pattern layer and said windings in a region enfolded by said windings.

2. A stator structure according to claim 1, wherein said shield includes two shield layers arranged with said distribution pattern layer therebetween in an axial direction of the motor.

3. A stator structure according to claim 1, wherein said shield includes a side shield covering a radial periphery of said multilayered printed board.

4. A stator structure according to claim 1, wherein said distribution pattern layer comprises a plurality of distribution blocks and an additional shield for shielding electromagnetism is provided at abutment between adjacent ones of said distribution blocks.

5. A stator structure of a motor comprising:

a stator core;

a first multilayered printed board arranged on an axial end face of said stator core;

first windings formed around said stator core and said first multilayered printed board toroidally in a regular winding manner;

a second multilayered printed board arranged on an outermost surface of said first windings;

second windings formed around said stator core, said first multilayered printed board and said first windings toroidally in a regular winding manner,

wherein said first multilayered printed board has a first distribution pattern layer to interconnect said first windings, and a first shield to shield electromagnetism between said first distribution pattern layer and said first windings, and said second multilayered printed board has a second distribution pattern layer to interconnect said second windings, and a second shield to shield electromagnetism between said second distribution pattern layer and said first and second windings.

6. A stator structure according to claim 5, wherein said second multilayered printed board has a third distribution pattern layer to interconnect said first windings, and a third shield to shield electromagnetism between said third distribution pattern layer and said first windings.

7. A stator structure according to claim 5, wherein said second shield includes two shield layers arranged with said second distribution pattern layer therebetween.

8. A stator structure according to claim 5, wherein said first and second shields include a side shield covering a radial periphery of said multilayered printed board.

9. A stator structure according to claim 5, wherein said distribution pattern layer comprises a plurality of distribution blocks and an additional shield is provided at abutment between adjacent ones of said distribution blocks.