PRIMARY PART OF A LINEAR MOTOR HAVING A COOLING PLATE

• US 20180175708A1
• Filed: 12/14/2017
• Published: 06/21/2018
• Est. Priority Date: 12/16/2016
• Status: Active Grant

• Current Assignee: ETEL S.A. (Dr. Johannes Heidenhain GmbH)
• Original Assignee: ETEL S.A. (Dr. Johannes Heidenhain GmbH)
• Inventors: Fernandes Goncalves, Jose Manuel
• Granted Patent: US 10,601,284 B2
• Time in Patent Office: Days
• CPC Class Codes: H02K 1/20 with channels or ducts for flow of cooling medium
• CPC Class Codes: H02K 41/02 Linear motors; Sectional motors
• CPC Class Codes: H02K 41/031 of the permanent magnet type
• CPC Class Codes: H02K 9/22 by solid heat conducting material embedded in, or arranged in contact with, the stator or rotor, e.g. heat bridges
• CPC Class Codes: H02K 9/227 Heat sinks

Abstract

A primary part of a linear motor includes a cooling plate with cooling channels mounted to a side of the primary part that faces away from an air gap of the linear motor. The cooling channels are connected to a coolant inlet and a coolant outlet via channels of a distributor. The channels extend between the cooling plate and winding end turns of the primary part in a direction of movement of the linear motor.

Claims

1. A primary part of a linear motor, the primary part comprising:

a cooling plate with cooling channels mounted to a side of the primary part that faces away from an air gap of the linear motor, wherein the cooling channels are connected to a coolant inlet and a coolant outlet via channels of a distributor, the channels extend between the cooling plate and winding end turns of the primary part in a direction of movement of the linear motor.

2. The primary part as recited in claim 1, wherein the cooling plate includes first and second plates which are joined together and between which the cooling channels extend transversely to the direction of movement of the linear motor.

3. The primary part as recited in claim 2, wherein the first and second plates of the cooling plate are two sheet-metal plates which are soldered together.

4. The primary part as recited in claim 2, wherein the cooling channels are formed into one or both of the first and second plates using a milling process or an etching process.

5. The primary part as recited in claim 1, wherein a lamination stack the of primary part is formed with projecting steps adjacent to mounting openings on the side that faces away from the air gap, the step height of the steps being greater than or equal to a thickness of the cooling plate.

6. The primary part as recited in claim 5, wherein the cooling plate includes first and second plates having coincident openings which correspond to the projecting steps such that the cooling plate is aligned on the primary part by the coincident openings and the steps.

7. The primary part as recited in claim 2, wherein one of the first and second plates which faces the primary part has two openings which extend in the direction of movement of the linear motor and connect to the cooling channels, the openings corresponding to the channels of the distributor and being soldered at an edge to the distributor.

8. The primary part as recited in claim 1, wherein the distributor is connected to a connecting piece configured to redirect coolant flow that emerges from the distributor perpendicularly to the cooling plate by 90 degrees such that the coolant inlet and the coolant outlet extend parallel to electrical connections of the primary part.

9. The primary part as recited in claim 8, wherein the distributor and the connecting piece form a right angle which acts as an abutment for the cooling plate against the primary part.