Driving system with converter control for low-voltage three-phase motors

• US 20040022041A1
• Filed: 05/02/2003
• Published: 02/05/2004
• Est. Priority Date: 05/04/2002
• Status: Active Grant

• Current Assignee: Jungheinrich AG
• Original Assignee: Jungheinrich AG
• Inventors: Hansen, Nils-Peter, Schwarz, Rudiger, Hormann, Frank, Jonas, Benjamin, Knieriem, Michael, Bergmann, Ulf, Lenz, Olaf
• Granted Patent: US 7,006,356 B2
• Time in Patent Office: Days
• US Class Current: 361/784
• CPC Class Codes: H02M 7/003 Constructional details, e.g. physical layout, assembly, wiring or busbar connections
• CPC Class Codes: H05K 1/144 Stacked arrangements of planar printed circuit boards
• CPC Class Codes: H05K 7/1432 specially adapted for power drive units or power converters
• CPC Class Codes: H05K 7/14322 wherein the control and power circuits of a power converter are arranged within the same casing
• CPC Class Codes: H05K 7/14329 specially adapted for the configuration of power bus bars

Abstract

Driving system with converter control for low voltage three-phase motors, which is provided with a power unit containing transistors and capacitors, a triggering unit for the transistors and a control unit as well as connections for direct and alternating current, the units being disposed in a common casing made of a heat-conductive material, characterised by the following features: the power unit is provided with a first printed circuit board (24) made of fairly heat-conductive material, which is disposed on the fairly heat-conductive bottom of the casing (12) in a plane fitting arrangement, a second printed circuit board (26) contains the triggering unit, the second printed circuit board (26) being electrically and mechanically connected to the first printed circuit board (24) in a spacing to it with the aid of contact pins (30) of metallic material attached on the first printed circuit board (24) by soldering, and terminal pins (22) are connected with contact points (38) of the first printed circuit board (24) and lead through openings in the second printed circuit board (26) as well as in the cover (14) in an insulated manner.

Claims

1. Driving system with converter control for low voltage three-phase motors, which is provided with a power unit containing transistors and capacitors, a triggering unit for the transistors and a control unit as well as connections for direct and alternating current, the units being disposed in a common casing made of a heat-conductive material, characterised by the following features:

the power unit is provided with a first printed circuit board (24) made of fairly heat-conductive material, which is disposed on the fairly heat-conductive bottom of the casing (12) in a plane fitting arrangement;

a second printed circuit board (26) contains the triggering unit, the second printed circuit board (26) being electrically and mechanically connected to the first printed circuit board (24) in a spacing to it with the aid of contact pins (30) of metallic material attached on the first printed circuit board (24) by soldering, and

terminal pins (22) are connected with contact points (38) of the first printed circuit board (24) and lead through openings in the second printed circuit board (26) as well as in the cover (14) in an insulated manner.

2. Driving system according to claim 1, characterised in that a third printed circuit board (64) containing the control unit is mechanically coupled with the bottom side of a cover (14) of the casing (12) and is electrically connected to the second printed circuit board (26) via a flat ribbon cable.

3. System according to claim 1, characterised in that the interconnection traces of the first printed circuit board (24) sit closely on the bottom of the casing (12).

4. System according to claim 1, characterised in that casing (12) and cover (14) are formed from aluminium.

5. System according to claim 1, characterised in that the contact pins (30) are soldered on the first printed circuit board (24) and are fixedly soldered into holes of the second printed circuit board on their upper ends.

6. System according to claim 5, characterised in that the contact pins (30) consist of a springy material and are formed axially yielding in the vicinity of its mounting, preferably by an outward bend or the like.

7. System according to claim 6, characterised in that the contact pins are approximately s-shaped in the bottom region.

8. System according to claim 6, characterised in that the contact pins (30) have an enlargement (34) between the ends, a frame (36) between the first and the second printed circuit board (24, 26) being supportable on it, the contact pins (30) extending into the upward direction through openings in the frame (36).

9. System according to claim 1, characterised in that the electrical connection between second and third printed circuit board (26, 64) takes place via a flat ribbon cable.

10. System according to claim 1, characterised in that first and second printed circuit board (24, 26) form a sandwich assembly.

11. System according to claim 1, characterised in that the terminal pins (22) are partially movable with respect to the points of connection (38) and are mechanically fixed in openings of the cover (14).

12. System according to claim 1, characterised in that the contact points are formed by sockets (38), which are soldered on the first printed circuit board (24) in a plane-fitting manner, and that the terminal pins (22) do have a sleeve portion (44) which is pushable up to a socket (42).

13. System according to claim 1, characterised in that a portion (16) of the cover (14) consists of plastic material, in the openings of which are fixedly attached the upper ends of the terminal pins (22).

14. System according to claim 13, characterised in that the portion (16) is disposed in a recess of the cover (14), preferably by the plastic material injection moulding method.

15. System according to claim 13, characterised in that the terminal pins (22) are provided with a radial flange (46), which engages into a recess (18) of the cover portion (16) in a rotationably fixed manner, and that a ring nut (52) co-operates with a thread in the recess (18) and can be brought into bearing with the flange (46).

16. System according to claim 15, characterised in that the ring nut (52) is provided with an outer flange (58) which has a saw-tooth form (60) on its perimeter which co-operates with an interior portion of the recess (18) in order to secure the ring (52) against rotation.

17. System according to claim 13, characterised in that the recess (18) in the cover portion (16) is formed in a downward-directed projection of the cover portion (16), which on its part engages into an indentation in the cover (14).