Motor

Abstract

The invention relates to an electric machine having a control unit or regulating unit and a fluid actuator (1), wherein the control unit or regulating unit is provided for controlling or regulating the actuator (1). In order to achieve favorable construction conditions, it is proposed that the control unit or regulating unit has a carrier plate (3) which is cast and encapsulated by a heat-conducting potting compound (2), wherein the control unit or regulating unit is in contact with a fluid-filled chamber (4) of the actuator (1) in the region of the potting compound (2). As a result, a separate cooling device can be omitted in the control unit or regulating unit.

Description

Technical Field

[0001] The invention relates to an electric machine having a control unit or regulating unit and a fluid actuator, wherein the control unit or regulating unit is provided for controlling or regulating the actuator. Background Art

[0002] In particular in vehicle electronics, it is often necessary to integrate devices with control electronics into motors, transmissions, pumps or chassis components, etc., in order to make the best possible use of limited installation space and to keep line paths short. In this case, the heat emitted by a carrier plate, for example, on which transistors are mounted, must be effectively dissipated in order to avoid damage to the device and a reduction in service life.

[0003] EP 2 429 273 A2 is known from the prior art, which describes a cooling device for an electrical appliance. An electronic circuit is arranged on a carrier plate. A cylindrical pressure shield contacts the power-losing element mechanically and thermally. The pressure shield is arranged between the housing inner wall and the power-losing element and presses the carrier plate against the inner side of a housing cover designed as a cooling body. The heat is discharged from the power-losing element to the surroundings via this housing cover.

[0004] Furthermore, WO 2018 / 114349 A1 shows a housing for an electric motor, in which a carrier plate is arranged, which has a cooling device arranged circumferentially thereon.

[0005] These solutions in their known form have the disadvantage that corresponding installation space must be provided for cooling devices for electrical devices and electrical machines or specifically for cooling electronic components. Summary of the invention

[0006] The object of the present invention is to specify a compact electric machine which is further developed compared to the prior art and which has electronic components which are cooled efficiently but without additional devices.

[0007] According to the invention, this object is achieved by means of an electric machine of the type mentioned at the outset, wherein the control unit or regulating unit has a carrier plate which is cast and encapsulated with a heat-conducting potting compound, wherein the control unit or regulating unit is in contact with a fluid-filled chamber of the actuator in the region of the potting compound.

[0008] Since the carrier plate is surrounded by the potting compound, heat transfer from the power-loss-generating mounting elements of the carrier plate directly into the potting compound is achieved. Since the control unit or the regulating unit is in contact with the fluid-filled chamber of the actuator in the region of the potting compound, the heat transferred to the potting compound is discharged to the fluid. Therefore, the mounting elements of the carrier plate or the control unit or the regulating unit are effectively cooled. It is possible to save a separate cooling device, for example, arranged on the carrier plate, thereby saving structural space and reducing the mass of the component. In addition, due to the potting compound, the carrier plate and its mounting elements are advantageously protected from environmental influences (for example, intruding substances) and loads (for example, impacts).

[0009] Advantageously, the potting compound is formed from a polyurethane having a Shore A hardness in the range between 48 and 53.

[0010] By this measure, the carrier plate and its mounting elements are particularly tightly surrounded by the potting compound, ie the carrier plate and its mounting elements are particularly effectively shielded from environmental influences. In addition, the use of polyurethane results in a low component mass.

[0011] An advantageous embodiment results if the potting compound is injected into a first housing of the control unit or regulating unit, which is closed on one side by means of a plate, wherein the plate adjoins a second housing of the actuator.

[0012] This measure enables a compact embodiment of the machine. It is possible to dispense with the laying of cables between the control unit or regulating unit and the actuator.

[0013] An advantageous solution is achieved if the potting compound is injected into a first housing of the control unit or regulating unit, wherein the potting compound adjoins a second housing of the actuator.

[0014] This measure enables particularly effective cooling of the control unit or regulating unit, since the heat is dissipated from the potting compound directly to the fluid-filled chamber of the second housing or of the actuator. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Hereinafter, the present invention will be described in more detail based on examples.

[0016] The accompanying drawings show by way of example:

[0017] Figure 1 : Schematic cross-sectional view of a schematic side view of a machine according to the invention. DETAILED DESCRIPTION

[0018] Figure 1 A schematic sectional view of an exemplary embodiment variant of an electric machine according to the invention is shown.

[0019] The control unit or regulating unit designed as an electronic regulator 5 has a carrier plate 3 which is arranged in a first housing 8 made of polyamide reinforced with glass fibers and is completely encapsulated by a heat-conducting potting compound 2 made of polyurethane.

[0020] A first mounting element 11 and a second mounting element 12, a third mounting element 13 and a fourth mounting element 14 are arranged on the carrier plate 3, the first mounting element being configured as a pressure sensor, and the first mounting element, the second mounting element, the third mounting element and the fourth mounting element being covered by the potting material 2. The first mounting element 11 is arranged on the lower side 15 of the carrier plate 3, and the second mounting element 12, the third mounting element 13 and the fourth mounting element 14 are arranged on the upper side 16 of the carrier plate 3. That is, the carrier plate 3 is mounted on both sides.

[0021] 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 by means of the first housing 8.

[0022] The potting compound 2 completely fills the housing interior space 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 transition temperature of approximately -60° C. Therefore, the motor can be used in a wide temperature range.

[0023] The embodiment of the potting compound 2 as polyurethane is an advantageous solution. However, according to the invention, it is also conceivable to form the potting compound 2 as silicone with a Shore A hardness in the range between 45 and 55, thereby achieving properties of the potting compound 2 similar to the embodiment made of polyurethane.

[0024] In the region 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 projects out of the first housing 8. Figure 1 Further contacts, not visible in the figure, connect the carrier plate 3 to a power source (not shown), which are likewise embodied as silver contact pins, are connected to the carrier plate 3 in the region of the top side 16 and protrude from the first housing 8 .

[0025] In the region of the underside 15 of the carrier plate 3 , the second contact 7 is implemented as a second silver contact pin and in Figure 1 Further contacts (not visible in the figure) in the form of further silver contact pins are connected to the carrier plate 3 .

[0026] The regulator 5 is connected via the second contact 7 and further contacts arranged in the region of the underside 15 of the carrier plate 3 to a motor 17 of the fluid actuator 1 , which is designed as a hydraulic actuator.

[0027] The adjuster 5 is connected to the actuator 1 via a clamping connection. However, it is also conceivable according to the invention to provide a screw connection between the adjuster 5 and the actuator 1.

[0028] The first contact 6, the second contact 7 and the further contact are partially enclosed by the potting compound 2. A first line path 18 is provided between the second contact 7 and the motor 17, and further line paths (not visible) are provided between the further contacts arranged in the region of the underside 15 of the carrier plate 3.

[0029] The first line path 18 and the further line path are arranged within the actuator 1 in a ring part 19 of the actuator 1. No cables running between the regulator 5 and the actuator 1 are required.

[0030] The actuator 1 or its ring part 19 is attached flush to the control unit or regulating unit or flush with the first housing 8 .

[0031] The motor 17 is designed as a brushless DC electric motor having an annular stator 20 and a rotor 21. The stator 20 is arranged in the ring part 19 of the actuator 1. The rotor 21 is driven by the stator 20 or the connection of the stator to the regulator 5, and is supported in the actuator 1 in a rotatable but non-displaceable manner.

[0032] The rotational movement of the rotor 21 is transmitted to a spindle-shaped section of the piston rod 22 , whereby the piston rod 22 and the piston 23 connected thereto execute a translational movement in the direction of the longitudinal axis 24 .

[0033] The piston rod 22 and the piston 23 are arranged in a cylinder 25 of the actuator 1, which is surrounded by the ring member 19. The piston rod 22 is supported and guided in the cylinder 25 via a bearing (not shown) so that it can perform rotational and translational movements.

[0034] A first seal (also not shown) is arranged between the piston rod 22 and the cylinder 25 in order to prevent moisture, particles and the like from penetrating into the cylinder 25 .

[0035] The chamber 4 formed by the movable piston 23 and the cylinder 25 is filled with hydraulic fluid. The cylinder 25 thus acts as a second housing 9 with respect to this hydraulic fluid.

[0036] The chamber 4 or the second housing 9 directly adjoins the plate 10 of the regulator 5. The control unit or regulating unit is in contact with the chamber 4 in the region of the potting compound 2.

[0037] Heat transferred into the potting compound 2 by the carrier plate 3 or the first, second, third and / or fourth mounting elements 11 , 12 , 13 and / or 14 is thereby dissipated from the potting compound 2 via the plate 10 into the chamber 4 , ie to the hydraulic fluid.

[0038] According to the invention, it is also possible to dispense with the plate 10 , so that the potting compound 2 directly adjoins the chamber 4 .

[0039] The chamber 4 is connected to a hydraulic tank (not shown) via a first hydraulic line 26, i.e., the chamber is supplied with hydraulic fluid via this hydraulic tank. The chamber 4 is connected to a hydraulic telescopic shock absorber (also not shown) of the motor vehicle via a second hydraulic line 27. The damping effect of the telescopic shock absorber is set by means of the piston 23 or the pressure of the hydraulic fluid. For this purpose, the pressure in the chamber 4 is continuously measured by means of a pressure sensor or a first mounting element 11, the measuring probe of which extends into the chamber 4. A second seal (not shown) is arranged between the first mounting element 11 and the cylinder 25 in order to prevent the potting compound 2 from being wetted by the hydraulic fluid.

[0040] The measured pressure is continuously compared with a defined setpoint pressure by means of the regulator 5. Based on the difference between the measured pressure and the setpoint pressure, the regulator 5 regulates the motor 17 by prescribing the voltage of the stator 20, i.e. switches the motor 17 on or off or sets the speed of the rotor 21, in order to achieve or maintain the setpoint pressure in the hydraulic fluid or in the telescopic shock absorber by means of a corresponding piston position and piston movement.

[0041] The embodiment of the actuator 1 as a hydraulic actuator is an advantageous solution. However, according to the invention it is conceivable to design the actuator 1 as a pneumatic actuator, for example, and to use this actuator for adjusting the brake cylinder pressure in a bogie brake of a rail vehicle.

[0042] It is also conceivable that the control unit or regulating unit is not used as a regulator 5 but as a control unit, ie the variable to be controlled is not measured by means of a sensor or this variable is not reacted to the regulating variable. For example, the control unit can be used in a hydraulic tensioning device.

[0043] Name List

[0044] 1 Actuator

[0045] 2. Casting material

[0046] 3 Carrier plate

[0047] 4 Chambers

[0048] 5 Regulator

[0049] 6 First contact

[0050] 7 Second contact

[0051] 8. First shell

[0052] 9 Second shell

[0053] 10 Plates

[0054] 11 First assembly component

[0055] 12 Second assembly component

[0056] 13 Third assembly component

[0057] 14 Fourth assembly component

[0058] 15 Lower side

[0059] 16 upper side

[0060] 17 Motor

[0061] 18 First pipeline path

[0062] 19 Ring parts

[0063] 20 Stator

[0064] 21 Rotor

[0065] 22 Piston rod

[0066] 23 Piston

[0067] 24 Vertical axis

[0068] 25 cylinder

[0069] 26 First hydraulic line

[0070] 27 Second hydraulic line.

Claims

1. An electric machine having a control unit or a regulating unit and a fluid actuator, wherein: The control unit or regulating unit is configured to control or regulate the fluid actuator, and is characterized in that: The control unit or regulating unit has a carrier plate (3) which is encapsulated by a heat-conducting potting compound (2), wherein the control unit or regulating unit is in contact with a fluid-filled chamber (4) of the fluid actuator (1) in the region of the potting compound (2). wherein the potting material (2) is injected into a first housing (8) of the control unit or regulating unit, which is closed on one side by means of a plate (10), wherein the plate (10) adjoins a second housing (9) of the fluid actuator (1); or The potting compound (2) is injected into a first housing (8) of the control unit or regulating unit, wherein the potting compound adjoins a second housing (9) of the fluid actuator (1).

2. The motor according to claim 1, characterized in that The potting compound ( 2 ) is formed from a polyurethane having a Shore A hardness in the range between 48 and 53.

3. The motor according to claim 1, characterized in that The potting compound ( 2 ) is formed from silicone having a Shore A hardness in the range between 45 and 55.

4. The motor according to any one of claims 1 to 3, characterized in that The carrier plate (3) is mounted on both sides.

5. The electric machine according to any one of claims 1 to 3, characterized in that The control unit or regulating unit is designed as a regulator (5) and has a sensor arranged on the carrier plate (3).

6. The electric machine according to any one of claims 1 to 3, characterized in that The fluid actuator (1) is designed as a hydraulic actuator.

7. The electric machine according to any one of claims 1 to 3, characterized in that The fluid actuator (1) is designed as a pneumatic actuator.

8. The electric machine according to any one of claims 1 to 3, characterized in that The control unit or regulating unit is connected to the fluid actuator (1) via at least one electrical contact.

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