EP3921927A1

EP3921927A1 - Electrical machine

Info

Publication number: EP3921927A1
Application number: EP20709571.2A
Authority: EP
Inventors: Thomas DOPPLER; Leopold Hellinger; Martin Johann MAYER
Original assignee: Melecs EWS GmbH
Current assignee: Melecs EWS GmbH
Priority date: 2019-03-13
Filing date: 2020-03-06
Publication date: 2021-12-15
Also published as: AT522208A1; WO2020182662A1; CN113519111A; JP2022524463A; JP7268187B2; US20220170488A1

Abstract

The invention relates to an electrical machine having an open-loop or closed-loop control unit and a fluidic actuator (1), wherein the open-loop or closed-loop control unit is designed for the open-loop or closed-loop control of the actuator (1). In order to achieve favourable design conditions, it is proposed for the open-loop or closed-loop control unit to have a carrier plate (3) cast in a thermally conductive casting compound (2), wherein the open-loop or closed-loop control unit makes contact with a fluid-filled chamber (4) of the actuator (1) in the region of the casting compound (2). It is thereby possible to dispense with separate cooling devices in the open-loop or closed-loop control unit.

Description

Electric machine

The invention relates to an electrical machine with a control or regulation unit and a fluidic one

Actuator, the control or regulating unit being provided for controlling or regulating the actuator.

In vehicle electronics in particular, there is often the need to integrate devices with control electronics in a motor, gearbox, pump or chassis components, etc. in order to make the best possible use of limited installation spaces and to keep cable routes short. Heat given off by carrier plates fitted with transistors, for example, must be effectively dissipated in order to avoid damage to the devices and a reduced service life.

EP 2 429 273 A2 is known from the prior art, in which a cooling device for an electrical device

is described. On a carrier plate is a

arranged electronic circuit. Cylindrical press-on domes make mechanical and thermal contact with elements that generate power loss. The pressing domes are between

Housing inner walls and the power loss generating

Elements provided and press the carrier plate against an inside of a housing cover designed as a heat sink. This housing cover dissipates heat from the elements that generate power loss to an environment.

Furthermore, WO 2018/114349 A1 shows a housing for an electrical machine, in which a carrier plate is provided with a cooling device arranged around it.

These approaches in their known forms have the disadvantage that for the electrical device and the electrical

Machine or dedicated cooling devices for cooling electronic components are used, for which appropriate installation space must be provided. The invention is based on the object of specifying a compact electrical machine that has been further developed compared to the prior art and has electronic components that are effectively cooled but without additional devices.

According to the invention this object is achieved with a

electrical machine of the type mentioned, in which the control or regulation unit with a

thermally conductive potting compound encapsulated carrier plate

having, wherein the control or regulation unit makes contact with a fluid-filled chamber of the actuator in the area of the potting compound.

Because the carrier plate is surrounded by the potting compound, there is a heat transfer of power loss

generating assembly elements of the carrier plate directly into the potting compound. Since the control or regulation unit makes contact with the fluid-filled chamber of the actuator in the area of the potting compound, the potting compound is applied

transferred heat to the fluid. Thus, the mounting elements of the carrier plate or the control or regulation unit are effectively cooled. On your own

for example arranged on the carrier plate

Cooling devices can be dispensed with, as a result of which installation space can be saved and component masses can be reduced.

Due to the potting compound, a

advantageous protection of the carrier plate and its

Assembly elements against environmental influences (e.g. before

penetrating substances) and loads (e.g. from impacts).

It is advantageous if the potting compound is made of polyurethane with a Shore A hardness in the range between 48 and 53.

By this measure, the carrier plate and their

Fitting elements enclosed particularly tightly by the potting compound, ie particularly effectively from environmental influences shielded. The use of polyurethane also results in a low component mass.

An advantageous embodiment is obtained when the

Potting compound is poured into a first housing of the control or regulation unit, which is closed on one side by means of a plate, the plate being adjacent to a second housing of the actuator.

This measure ensures a compact design of the

Machine achieved. There is no need to lay cables between the control or regulation unit and the actuator.

A favorable solution is achieved when the potting compound is poured into a first housing of the control or regulation unit, the potting compound adjoining a second housing of the actuator.

This measure achieves particularly effective cooling of the control or regulation unit, since heat is given off from the potting compound directly to the second housing or the fluid-filled chamber of the actuator.

The invention is explained in more detail below on the basis of exemplary embodiments.

It shows as an example:

Fig. 1: A schematic side elevation of a

Machine according to the invention in section.

1 shows an exemplary embodiment variant of an electrical machine according to the invention in a sectional illustration.

A control or regulating unit designed as an electronic regulator 5 has a carrier plate 3 which, completely encapsulated by a thermally conductive potting compound 2 made of polyurethane, in a first housing 8, which is made of polyamide reinforced with glass fibers,

is arranged.

A first fitting element 11, which is designed as a pressure sensor, and a second fitting element 12, a third fitting element 13 and a fourth fitting element 14, which are encased by the potting compound 2, are provided on the carrier plate 3. The first fitting element 11 is arranged on an underside 15 of the carrier plate 3, the second fitting element 12, the third fitting element 13 and the fourth fitting element 14 on an upper side 16 of the carrier plate 3. The carrier plate 3 is therefore equipped on both sides.

The first housing 8 and the carrier plate 3 are cylindrical. The first housing 8 is closed at the end by means of an inserted plate 10. The plate 10 is clamped to the first housing 8.

The sealing compound 2 completely fills a housing interior formed by the first housing 8 and the plate 10.

The polyurethane of the potting compound 2 has a Shore A hardness in the range between 48 and 53, a thermal conductivity of 0.97 W / mK and a glass temperature of approx. -60 ° C. The electrical machine can therefore in a large

Temperature range are used.

An embodiment of the potting compound 2 in polyurethane is an inexpensive solution. According to the invention, however, it is also conceivable to use the casting compound 2 in silicone with a Shore A hardness in the range between 45 and 55

train, whereby comparable properties of the potting compound 2 can be achieved with the execution in polyurethane. In the area of the upper side 16 of the carrier plate 3, a first contact 6 designed as a first silver contact pin is connected to the carrier plate 3 and protrudes from the first housing 8. Via this first contact 6 as well as other contacts not visible in FIG connected power supply.

In the area of the underside 15 of the carrier plate 3, a second contact 7 designed as a second silver contact pin as well as further contacts, not visible in FIG. 1, designed as further silver contact pins with the

Support plate 3 connected.

The controller 5 is connected to a motor 17 of a fluidic actuator 1 designed as a hydraulic actuator via the second contact 7 and the further contacts arranged in the area of the underside 15 of the carrier plate 3.

The controller 5 is connected to the actuator 1 via a clamp connection. According to the invention, however, it is also conceivable to provide screw connections between the controller 5 and the actuator 1.

The first contact 6, the second contact 7 and the further contacts are partially encased by the potting compound 2. A first conduction path 18 is provided between the second contact 7 and the motor 17, and between the further ones arranged in the area of the underside 15 of the carrier plate 3

Other lines that are not visible to the contacts.

The first conduction path 18 and the further conduction paths are arranged within the actuator 1, in a ring part 19 of the actuator 1. Cables running between the controller 5 and the actuator 1 are not required.

The actuator 1 or its ring part 19 is connected flush with the control or regulating unit or is flush with the first housing 8. The motor 17 is a brushless direct current electric motor with an annular stator 20 and a rotor 21

educated. The stator 20 is in the ring part 19 of the

Actuator 1 is provided. About the stator 20 or its

In connection with the controller 5, the rotor 21, which is rotatably but immovably mounted in the actuator 1, is driven.

Rotational movements of the rotor 21 are transmitted to a spindle-shaped section of a piston rod 22, whereby the

Piston rod 22 and a piston 23 connected to it execute translational movements in the direction of a longitudinal axis 24.

The piston rod 22 and the piston 23 are provided in a cylinder 25 of the actuator 1 which is encased by the ring part 19. The piston rod 22 is over a no

The bearing shown is supported and guided in the cylinder 25 so that it can perform rotational and translational movements.

A first seal, likewise not shown, is provided between the piston rod 22 and the cylinder 25 in order to prevent moisture and particles etc. from penetrating into the cylinder 25.

A chamber 4, which is formed by the movable piston 23 and the cylinder 25, is filled with a hydraulic fluid. The cylinder 25 therefore functions as a second housing 9 with respect to this hydraulic fluid.

The chamber 4 or the second housing 9 is directly adjacent to the plate 10 of the controller 5. The control or

The control unit makes contact with the chamber 4 in the area of the potting compound 2.

This is of the carrier plate 3 or the first

Fitting element 11, the second fitting element 12, the third fitting element 13 and / or the fourth

Fitting element 14 in the casting compound 2 transferred heat from the casting compound 2 via the plate 10 in the chamber 4, ie dissipated to the hydraulic fluid. According to the invention, it is also possible to dispense with the plate 10, as a result of which the potting compound 2 directly adjoins the chamber 4.

The chamber 4 is connected via a first hydraulic line 26 to a hydraulic tank (not shown), i. supplied with hydraulic fluid via this hydraulic tank.

The chamber 4 is connected to a hydraulic line (also not shown) via a second hydraulic line 27

Telescopic shock absorbers of a motor vehicle connected. A damping effect of the telescopic shock absorber is set by means of the piston 23 or a pressure of the hydraulic fluid. For this purpose, the pressure sensor or the first

Equipping element 11, the measuring probe of which protrudes into the chamber 4, the pressure in the chamber 4 is continuously measured.

A second seal, not shown, is provided between the first fitting element 11 and the cylinder 25 in order to prevent the potting compound 2 from being wetted with hydraulic fluid.

By means of the controller 5, the measured pressure is continuously compared with a defined setpoint pressure. On the basis of a difference between the measured pressure and the setpoint pressure, the motor 17 is regulated by the controller 5 via corresponding voltage specifications to the stator 20, i.e. the motor 17 is switched on or off or a speed of the rotor 21 is set in order by means of corresponding

Piston positions and movements the target pressure in the

To reach or hold hydraulic fluid or in the telescopic shock absorber.

When the actuator 1 is designed as a hydraulic actuator, it is an inexpensive solution. According to the invention, however, it is also conceivable to design the actuator 1, for example, as a pneumatic actuator and to use this for setting brake cylinder pressures in a bogie brake

Use rail vehicle. Furthermore, it is conceivable that the control or regulation unit not as a controller 5, but as a

Control unit, i.e. without measuring a variable to be controlled by means of a sensor or without this variable affecting a manipulated variable. For example, the

Control unit can be used in a hydraulic clamping device.

List of names

1 actuator

2 casting compound

3 support plate

4 chamber

5 controls

6 First contact

7 Second contact

8 First case

9 Second housing

10 plate

11 First component

12 Second component

13 Third component

14 Fourth component

15 bottom

16 top

17 engine

18 First route

19 ring part

20 stator

21 rotor

22 piston rod

23 pistons

24 longitudinal axis

25 cylinders

26 First hydraulic line

27 Second hydraulic line

Claims

1. Electrical machine with a control or

Control unit and a fluidic actuator, the control or regulation unit being provided for controlling or regulating the actuator, thereby

marked,

that the control or regulation unit has a carrier plate (3) encapsulated with a thermally conductive potting compound (2), the control or regulating unit making contact with a fluid-filled chamber (4) of the actuator (1) in the area of the potting compound (2).

2. Electrical machine according to claim 1, characterized

characterized in that the potting compound (2) is made of polyurethane with a Shore A hardness in the range between 48 and 53.

3. Electrical machine according to claim 1, characterized

characterized in that the potting compound (2) is made of silicone with a Shore A hardness in the range between 45 and 55.

4. Electrical machine according to one of claims 1 to 3, characterized in that the carrier plate (3) is equipped on both sides.

5. Electrical machine according to one of claims 1 to 4, characterized in that the control or

Control unit is designed as a controller (5) and has a sensor arranged on the carrier plate (3).

6. Electrical machine according to one of claims 1 to 5, characterized in that the actuator (1) as

Hydraulic actuator is formed.

7. Electrical machine according to one of claims 1 to 5, characterized in that the actuator (1) as

Pneumatic actuator is formed.

8. Electrical machine according to one of claims 1 to 7, characterized in that the control or

Control unit is connected to the actuator (1) via at least one electrical contact.

9. Electrical machine according to one of claims 1 to 8, characterized in that the potting compound (2) is poured into a first housing (8) of the control or regulation unit, which is closed on one side by means of a plate (10), wherein the plate (10) adjoins a second housing (9) of the actuator (1).

10. Electrical machine according to one of claims 1 to 8, characterized in that the potting compound (2) is poured into a first housing (8) of the control or regulation unit, the potting compound (2) to a second housing (9) of the Actuator (1) is adjacent.