Electric drive with a circuit board

• US 20100118503A1
• Filed: 11/05/2009
• Published: 05/13/2010
• Est. Priority Date: 11/13/2008
• Status: Active Grant

• Current Assignee: Bühler Motor GmbH
• Original Assignee: Bühler Motor GmbH
• Inventors: Kellermann, Helmut
• Granted Patent: US 8,310,838 B2
• Time in Patent Office: Days
• US Class Current: 361/772
• CPC Class Codes: H05K 2201/0179 Thin film deposited insulating layer, e.g. inorganic layer for printed capacitor
• CPC Class Codes: H05K 2201/09581 Applying an insulating coating on the walls of holes
• CPC Class Codes: H05K 2201/1059 Connections made by press-fit insertion
• CPC Class Codes: H05K 3/28 Applying non-metallic protective coatings H05K3/0091 takes precedence; methods for intermediate insulating layers for build-up multilayer circuits H05K3/4673
• CPC Class Codes: H05K 3/284 for encapsulating mounted components H05K1/185 takes precedence
• CPC Class Codes: H05K 3/308 Adaptations of leads connectors to printed circuits H01R12/00
• CPC Class Codes: Y10T 29/49139 by inserting component lead or terminal into base aperture

Abstract

An electric drive (1) with a circuit board (2), having conductor tracks (3) and contact openings (4) with plated through-holes (5) and equipped with electronic components (6), the circuit board (2) being coated with a protective layer (7) of insulating material, and press-fit contacts (8) are inserted into the contact openings (4) and in electrical contact areas (9) within the contact openings (4) electrical contact exists between a press-fit contact (8) and the plated through-hole (5) of the contact opening (4). The task of the invention is to reliably protect circuit boards of electric drives exposed to moisture and other chemical environmental effects and contact them economically. This task is solved according to the invention in that the protective layer (7) is a parylene coating, which covers the circuit board (2), the electronic components (6) and the surface areas of the contact openings (4) and circuit board (2) directly connected to the contact areas (9) between at least one press-fit contact (8) and at least one contact opening (4).

Claims

1. An electric drive comprising:

a circuit board having a mounting surface;

a plurality of conductor tracks formed on the mounting surface;

a plurality of contact openings with plated through-holes formed in the circuit board;

at least one electronic component mounted on the mounting surface;

a protective layer of insulating material formed from Parylene coating the mounting surface, the conductor tracks, the surface areas of the contact openings and the circuit board connected directly to the contact areas between at least one press-fit contact and at least one contact opening, the plated through-holes, and the electronic component; and

press-fit contacts inserted into the contact openings and in electrical contact areas and within the contact openings electrical contact exists between a press-fit contact and plated through-hole of the contact opening.

2. The electric drive according to claim 1, wherein the protective layer is separated in the contact area by a press-fit contact area.

3. The electric drive according to claim 1, wherein the protective layer is at least partially displaced from the contact area by the press-fit contact.

4. The electric drive according to claim 1, wherein the protective layer is a parylene D coating.

5. The electric drive according to claim 1, wherein the press-fit contacts are free of any Parylene coating.

6. The electric drive according to claim 1, wherein the circuit board is a component of a brushless DC motor.

7. The electric drive according to claim 6, wherein the brushless DC motor is a component of a pump drive.

8. The electric drive according to claim 7, wherein the pump drive is a rotary pump drive.

9. A method for production of an electric drive assembly with a circuit board having conductor tracks and contact openings with plated through-holes and equipped with electronic components, the method comprising the steps of:

a) coating the circuit board with a protective layer and insulating material by vacuum depositing of Parylene material from the gas phase onto the circuit board, the electronic components and the contact openings;

b) mounting the coating circuit board in an electric drive; and

c) inserting press-fit contacts into the contact openings and in the electrical contact areas within the contact openings so that electrical contact exists between a press-fit contact and the plated through-hole of the contact opening, and joining the press-fit contacts in the corresponding contact opening in order to separate the protective layer in the contact areas.

10. An electric assembly comprising:

a circuit board having a mounting surface;

a plurality of conductor tracks formed on the mounting surface;

a plurality of contact openings with plated through-holes formed in the circuit board;

at least one electronic component mounted on the mounting surface;

a protective layer of insulating material formed from Parylene coating the mounting surface, the conductor tracks, the surface areas of the contact openings and the circuit board connected directly to the contact areas between at least one press-fit contact and at least one contact opening, the plated through-holes, and the electronic component; and

press-fit contacts inserted into the contact openings and in electrical contact areas and within the contact openings electrical contact exists between a press-fit contact and plated through-hole of the contact opening.

11. The electric assembly according to claim 10, wherein the protective layer is separated in the contact area by a press-fit contact area.

12. The electric assembly according to claim 10, wherein the protective layer is at least partially displaced from the contact area by the press-fit contact.

13. The electric assembly according to claim 10, wherein the protective layer is a Parylene D coating.

14. The electric assembly according to claim 10, wherein the press-fit contacts are free of any Parylene coating.

15. The electrical assembly according to claim 10, wherein the circuit board is a component of a brushless DC motor.

16. The electrical assembly according to claim 15, wherein the brushless DC motor is a component of a pump drive.

17. The electrical assembly according to claim 16, wherein the pump drive is a rotary pump drive.