Holding pieces for coils of a primary part of a ironless linear motor

Patent metadata

Field	Value
Publication number	US-9647511-B2
Application number	US-201314080101-A
Country	US
Kind code	B2
Filing date	Nov 14, 2013
Priority date	Nov 15, 2012
Publication date	May 9, 2017
Grant date	May 9, 2017

Abstract

A primary part of an ironless linear motor includes a cooling plate on which flat coils are disposed, each having a central opening. The coils are pressed onto the cooling plate by holding pieces which taper toward the cooling plate and engage in the openings in the coils. In this manner, an especially good contact is produced between the flat coils of the primary part and the cooling plate prior to encapsulating the primary part with a synthetic resin, the cooling effect of the preferably actively cooled cooling plate thereby being increased markedly.

First claim

What is claimed is:

1. A primary part for an ironless linear motor, comprising:
a cooling plate;
flat coils arranged on the cooling plate, each coil having a central opening; and
holding pieces having tapered exterior surfaces, the tapered exterior surfaces tapering toward the cooling plate, the tapered exterior surfaces of the holding pieces engaging in the openings in the coils, the holding pieces pressing the coils onto the cooling plate by the engagement of the tapered exterior surfaces of the holding pieces and the openings in the coils, wherein the tapered exterior surfaces of the holding pieces are in direct contact with interior surfaces of the openings in the coils and secure the coils on the cooling plate with form locking in all directions.

2. The primary part according to claim 1 , wherein the cooling plate and the holding pieces have corresponding bores, the primary part including centering pins inserted through the bores.

3. The primary part according to claim 1 , further comprising screws that press the holding pieces against the cooling plate.

4. The primary part according to claim 1 , wherein coils are arranged on both sides of the cooling plate opposite to each other in pairs.

5. The primary part according to claim 4 , wherein the cooling plate and the holding pieces have corresponding bores, the primary part including centering pins inserted through the bores, and wherein two holding pieces of each pair of mutually facing coils are arranged opposite to each other on both sides of the cooling plate and are aligned relative to each other by at least one of the centering pins.

6. The primary part according to claim 5 , wherein the two mutually opposing holding pieces are screwed to each other by at least one screw to press the mutually facing coils against the cooling plate by the holding pieces.

7. The primary part according to claim 1 , wherein the flat coils are wound as cup springs, so that a pressure force exerted by the holding piece in an inner area of the coils is transferred by a spring action to an outer area of the coils, and the coils are pressed over an entire surface against the cooling plate.

8. The primary part according to claim 1 , wherein the tapered exterior surfaces of the holding pieces and the openings of the coils have complementary geometries.

9. The primary part according to claim 1 , wherein the holding pieces secure the coils on the cooling plate with form locking between the tapered exterior surfaces of the holding pieces and the openings of the coils.

10. A linear motor, comprising:
a primary part including:
a cooling plate;
flat coils arranged on the cooling plate, each coil having a central opening; and
holding pieces having tapered exterior surfaces, the tapered exterior surfaces tapering toward the cooling plate, the tapered exterior surfaces of the holding pieces engaging in the openings in the coils, the holding pieces pressing the coils onto the cooling plate by the engagement of the tapered exterior surfaces of the holding pieces and the openings in the coils, wherein the tapered exterior surfaces of the holding pieces are in direct contact with interior surfaces of the openings in the coils and secure the coils on the cooling plate with form locking in all directions.

11. The linear motor according to claim 10 , wherein the tapered exterior surfaces of the holding pieces and the openings of the coils have complementary geometries.

12. The primary part according to claim 10 , wherein the holding pieces secure the coils on the cooling plate with form locking between the tapered exterior surfaces of the holding pieces and the openings of the coils.

Assignees

• Etel Sa

Inventors

• Morel Jean-Pierre

Classifications

• H02K3/47

  Air-gap windings, i.e. iron-free windings · CPC title

• H02K41/03 Primary

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

• H02K9/22 Primary

  by solid heat conducting material embedded in, or arranged in contact with, the stator or rotor, e.g. heat bridges · CPC title

• H02K41/02 Primary

  Linear motors; Sectional motors · CPC title

• H02K9/223

  Heat bridges · CPC title