Electrical implementation unit having a conical contact surface engaging a conical borehole formed in a housing of an electrical component

Abstract

The invention relates to an electrical feed-through unit for penetration of electrical contacts through the wall of a housing of an electric motor. It has a pin made of an electrically conducting material, which is surrounded by an electrically insulating material. The pin possesses an at least partially wedge-shaped contact surface for the area of a penetration through the wall of the housing and is able to be arranged with the sheath surrounding it in an at least partially wedge-shaped borehole penetrating through the wall of the housing. In addition, the invention relates to a housing of an electric motor, which contains at least one such electrical feed-through unit as well as an electric motor which has such a housing. What is advantageous with the design of an electric motor proposed here, is that, through savings in assembly time and assembly expense, as well as parts costs, it is possible to assemble the motor components in the motor housing very simply and favorably, and additionally a number of advantages are offered as compared to use of conventional glass-to-metal feed-through (GTMS). The openings in the motor housing required for the electrical feed-through units are small, resulting in improved pressure resistance and stiffness of the motor housing. The cross-sectional surface to be sealed is also small, and as a consequence, the rates of leakage and permeation are low.

Claims

1. An electrical device comprising: a housing (5) having a wall with a borehole formed therein, wherein an entirety of the borehole is conical in shape; an electrical feed-through unit (7) for penetration of electrical contacts through the wall of the housing (5), the electrical feed-through unit (7) having a pin (9) made of an electrically conducting material surrounded by an electrically insulating sheath (10), the pin (9) including a contact surface contacting the sheath (10), wherein the electrical feed-through unit (7) is arranged with the sheath (10) surrounding the pin (9) within the borehole, characterized in that an entirety of the contact surface of the pin (9) disposed within the borehole is conical in shape.

2. The electrical device of claim 1, characterized in that an entirety of a portion of the sheath (10) disposed in the borehole and engaging the contact surface of the pin (9) is conical in shape.

3. The electrical device of claim 1, characterized in that the sheath (10) consists of Duromer.

4. The electrical device of claim 1, characterized in that the electrically conducting pin (9) consists of a noble metal or alloy thereof.

5. The electrical device of claim 1, characterized in that the pin (9) and the sheath (10) form an integral electrical feed-through unit (7).

6. The electrical device of claim 1, characterized in that the pin (9) and the sheath (10) form a two-piece electrical feed-through unit (7).

7. The electrical device of claim 1, characterized in that the pin (9) of the electrical feed-through unit (7) is attached by press bonding with the sheath (10) surrounding the pin (9) in the borehole of the housing (5).

8. The electrical device of claim 1, characterized in that a pressure difference between the two sides of the wall of the housing (5), through which the electrical feed-through unit (7) penetrates, fixes the pin (9) and the sheath (10) surrounding the pin (9) within the borehole.

9. The electrical device of claim 1, characterized in that the pin (9) in connection with the sheath (10) surrounding the pin (9) hermetically seals the housing (5) of the electric device, i.e. in gas-tight fashion.

10. The electric device of claim 1, wherein the electrical device is an electric motor (1, 1a, 1b), characterized in that the electric motor (1, 1a, 1b) has an interior runner configuration, in which a rotor (3) is situated within a stator (2), wherein the electrical feed-through unit (7) is able to be accessed through an inner stator opening for assembly and/or for contacting.

11. The electric device of claim 1, wherein the electrical device is an electric motor (1, 1a, 1b), characterized in that the electric motor (1, 1a, 1b) has an exterior runner configuration, in which a stator (2) is situated within a rotor (3) and the rotor (3) surrounds the stator (2), wherein the at least one electrical feed-through unit (7) is accessible outside a diameter of the stator for assembly and/or contacting.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Further particulars, features and advantages of embodiments of the invention are derived from the following specification of embodiment examples with reference to the pertinent drawings. Shown are:

(2) FIG. 1: Side view of an electrical exterior runner motor for hermetically sealed applications with installed electrical feed-through unit

(3) FIG. 2: Rear view of an electrical exterior runner motor for hermetically sealed applications with installed electrical feed-through unit

(4) FIG. 3: Rear view of the electrical exterior runner motor without the rotor

(5) FIG. 4: Side view of an electrical interior runner motor for hermetically sealed applications with installed electrical feed-through unit

(6) FIG. 5: Rear view of an electrical interior runner motor for hermetically sealed applications with installed electrical feed-through unit

(7) FIG. 6: Rear view of the electrical interior runner motor without the rotor

(8) FIG. 7: Electrical feed-through unit in housing

(9) FIG. 8: One-piece electrical feed-through unit

(10) FIG. 9: Two-piece electrical feed-through unit

DETAILED DESCRIPTION OF THE INVENTION

(11) FIG. 1 shows a brushless electric motor 1. Here in the version of an exterior runner motor 1a. Here the stator 2 is located within the rotor 3, which surrounds the stator. The electrical control device is attached to the stator windings 4. This exterior runner motor 1a is suitable for hermetically sealed applications and is surrounded by a gas-tight housing 5. The motor bearing 6 is also situated within the stator 2. For contacting the electric motor 1 externally, on housing 5, an electrical feed-through unit 7 is situated. The electrical feed-through unit 7 is inserted with a wedge shape into housing 5. The section A indicates the area of electrical feed-through unit 7 in housing 5.

(12) FIG. 2 shows a rear view of the exterior runner motor 1a from FIG. 1. The elements of stator 2 are partially covered by the rotor. Also the electrical feed-through units 7 are only perceived in a partial fashion. The motor 1 is in a hermetically sealed housing 5.

(13) FIG. 3 shows the arrangement from FIG. 2, with the rotor 3 not depicted here. By this means, the electrical feed-through units 7 are able to be seen here very well. The crosshatched area 8 represents the area of motor housing 5 which is particularly well suited for electrical feed-through units. The area 8 of motor housing 5 that is particularly well suited for electrical feed-through units is limited, in an exterior runner motor 1a, to the area outside the exterior stator diameter.

(14) Similar to FIG. 1, FIG. 4 represents an interior runner motor 1b. Here also, the individual components of motor 1 are arranged within housing 5. However, here the stator 2 lies outside rotor 3. Thus, rotor 3 runs within stator 2 here. The arrangement of stator winding 4 and motor bearing 6 is altered here compared to exterior runner motor 1a. The electrical feed-through unit 7 is shown within section A.

(15) FIG. 5 depicts a rear view of interior runner motor 1b. The stator 2 is positioned outside rotor 3. The components are arranged within housing 5. Since they are covered by rotor 3, the electrical feed-through units 7 cannot be seen.

(16) FIG. 6 shows a rear view of the interior runner motor 1b without the rotor 3. The elements of stator 2, as also the crosshatched area 8 suitable for electrical feed-through devices, are arranged within housing 5. This area 8 is limited in an interior runner motor 1b to the area within the inner stator diameter.

(17) FIG. 7 shows the section A from FIGS. 1 and 4. The electrical feed-through unit 7 consists of an electrically conducting pin 9 and a sheath 10 consisting of Duromer. The electrical feed-through unit 7 is secured in housing 5 by press bonding. The forces which appear due to the wedge-shaped contact surface of pin 9 and sheath 10 Ex feed-through unit 7 in housing 5.

(18) FIG. 8 shows a one-piece version of electrical feed-through unit 7. The sheath 10 and metal pin 9 are firmly attached. Metal pin 9 was extrusion-coated with insulating material.

(19) FIG. 9 depicts a two-piece version of electrical feed-through unit 7. The sheath 10 made of insulating material is slid over metal pin 9 here.

LIST OF REFERENCE SYMBOLS

(20) 1 Electric motor 1a Exterior runner motor 1b Interior runner motor 2 Stator 3 Rotor 4 Stator winding, stator windings 5 Motor housing, housing 6 Motor bearing 7 Electrical feed-through unit A Section of image that shows the electrical feed-through unit 8 Area of the motor housing which is particularly suited for electrical feed-through units 9 Metal pin, pin, wedge-shaped pin 10 sheath, wedge-shaped sheath, insulating material
Interior runner motor