Motor assembly provided with heating system

Abstract

Embodiments of the present disclosure relate to a motor assembly provided with a heating system, comprising a motor (100) and a heating system adapted to heat the motor (100), the motor comprising a frame (2) and two end caps (41, 42) connected to the frame (2), the heating system comprising at least one electrical heating element (8). A circumferential portion (48) of at least one of the end caps (41, 42) is provided with at least one through-hole (50), and the at least one electric heating element (8) extends through the at least one through-hole (50), and an operating portion of the at least one electric heating element (8) located inside the end cap (41, 42) is located between the end cap (41, 42) and a stator winding (6) of the electric machine (100) in an axial direction of the electric machine (100).

Description

Technical Field

[0001] The utility model relates to a motor component provided with a heating system. Background Art

[0002] It is known in the art to provide a motor assembly with a heating system, which is suitable for keeping the motor windings dry by increasing the temperature of the motor windings. A known motor assembly provided with a heating system is disclosed in publication US 10615 674 B2.

[0003] One of the disadvantages associated with the above-mentioned known motor assemblies is that their heating systems are difficult to retrofit. Utility Model Content

[0004] The purpose of the present invention is to provide a motor assembly to alleviate the above disadvantages. The purpose of the present invention is achieved by the motor assembly described below.

[0005] The present invention is based on the idea of ​​providing an electric motor assembly with a heating system, the heating system comprising at least one electric heating element, which extends through at least one through-hole formed in a circumferential portion of an end shield of the electric motor, wherein an operating part of the at least one electric heating element is adapted to pass through the at least one through-hole.

[0006] In one embodiment, a motor assembly is provided with a heating system, the motor assembly comprising: a motor including a frame and two end shields connected to the frame, wherein the motor is a rotating motor having a stator winding, and each of the end shields includes a circumferential portion extending in an axial direction of the motor; and a heating system suitable for heating the motor, the heating system including at least one electric heating element, the electric heating element having a resistor member and a connecting lead suitable for supplying power to the resistor member, wherein the circumferential portion of at least one of the end shields is provided with at least one through-hole, and the at least one electric heating element extends through the at least one through-hole, and an operating portion of the at least one electric heating element located inside the end shield is located between the end shield and the stator winding in the axial direction of the motor, wherein the operating portion of the at least one electric heating element is suitable for passing through the at least one through-hole.

[0007] In one embodiment, an operating portion of the at least one electric heating element at least partially overlaps a bearing of the electric motor in an axial direction of the electric motor.

[0008] In one embodiment, the at least one electric heating element operating portion is located outside a bearing of the motor in a radial direction of the motor.

[0009] In one embodiment, the operating portion of at least one of the electric heating elements has the form of an elongated rod extending rectilinearly.

[0010] In one embodiment, the operating portion of the at least one electric heating element extends at a rod angle relative to a plane perpendicular to the axial direction of the motor, wherein the rod angle is in the range of 0°-10°.

[0011] In one embodiment, the heating system includes a first electric heating element and a second electric heating element, and a circumferential portion of one of the end shields includes a first through-hole and a second through-hole spaced apart in the circumferential direction, wherein the first electric heating element extends through the first through-hole and the second electric heating element extends through the second through-hole.

[0012] In one embodiment, the angular distance between the first through hole and the second through hole is greater than or equal to 10°.

[0013] In one embodiment, the motor assembly comprises a sensor system adapted to measure the temperature and / or humidity inside at least one of the end shields, wherein the sensor system comprises at least one sensor element extending through at least one through-hole provided in a circumferential portion of at least one of the end shields.

[0014] In one embodiment, wherein the motor assembly includes a controller, the controller is communicatively connected to the sensor system and is adapted to control the heating system based on sensor information received from the sensor system

[0015] The advantage of the motor assembly of the present invention is that its heating system is easy to retrofit. Retrofitting does not require moving the end shield relative to the frame of the motor. Instead, it is sufficient to push at least one electric heating element through at least one through-hole in the end shield. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be described in more detail below through preferred embodiments with reference to the accompanying drawings, in which

[0017] Figure 1 A motor assembly according to an embodiment of the present invention is shown;

[0018] Figure 2 Shown Figure 1 A simplified cross-section of the motor assembly is shown; and

[0019] Figure 3 Shown Figure 2 Detail of a simplified cross section shown. DETAILED DESCRIPTION

[0020] Figure 1A motor assembly is shown that includes a motor 100, a heating system suitable for heating the motor 100, a sensor system, and a controller 909. The motor 100 is a rotating motor that includes a frame 2, a stator that is immovably supported to the frame 2 and includes a stator core and stator windings, a rotor that is housed in the stator and rotatably supported to the frame 2, and two end shields 41 and 42 connected to the frame 2.

[0021] Figure 2 Shown Figure 1 The illustrated motor assembly is a simplified cross-section taken from a direction perpendicular to the axial direction of the motor 100 , which is parallel to the rotor axis of the motor 100 . Figure 3 Shown Figure 2 Detail of a simplified cross section shown.

[0022] The end shields 41 and 42 are adapted to support the bearings 12 of the motor 100. Figure 1 , the end shield 41 is detached from the frame 2. The end shields 41 and 42 are spaced apart in the axial direction of the motor 100. Each of the end shields 41 and 42 includes a circumferential portion 48 that extends in the axial direction of the motor 100 and forms a radially outer surface of the end shield.

[0023] The heating system comprises four electric heating elements 8 , each having a resistor member 82 and a connecting lead 84 adapted to supply power to the resistor member 82 . Figure 2 and Figure 3 One of the connecting leads 84 is depicted in FIG. Figure 1 All connecting leads are omitted.

[0024] The circumferential portion 48 of the end shield 42 is provided with two through-holes 50, and one electric heating element 8 extends through each of the through-holes 50 provided in the end shield 42. The circumferential portion 48 of the end shield 41 is provided with three through-holes, respectively indicated by reference numerals 501, 502, and 50. There is a first electric heating element extending through the first through-hole 501 and a second electric heating element extending through the second through-hole 502. The sensor element 9 of the sensor system extends through the third through-hole.

[0025] The first through-hole 501 and the second through-hole 502 are spaced apart in the circumferential direction. The angular distance between the first through-hole 501 and the second through-hole 502 is approximately 60°. In an alternative embodiment, the heating system includes only one electric heating element. In another embodiment, the heating system includes two electric heating elements connected to the end shield, and the angular distance between the first through-hole accommodating one of the two electric heating elements and the second through-hole accommodating the other of the two electric heating elements is greater than or equal to 10°.

[0026] The sensor element 9 is adapted to measure the temperature and humidity inside the end shields 41. In an alternative embodiment, the motor assembly comprises a sensor system adapted to measure the temperature and / or humidity inside at least one of the end shields, wherein the sensor system comprises at least one sensor element extending through at least one through-hole provided in a circumferential portion of at least one of the end shields.

[0027] The controller 909 is communicatively connected to the sensor system and is adapted to control the heating system based on sensor information received from the sensor system. In one embodiment, the controller is adapted to control the heating system so as to keep the windings of the motor dry by keeping their temperature above the dew point.

[0028] Figure 2 and Figure 3 As shown, the operating portion of the electric heating element 8 located within the end shield 41 is located between the end shield 42 and the stator winding 6 in the axial direction of the motor 100. The operating portion of the electric heating element 8 is adapted to pass through a corresponding through-hole. Therefore, the electric heating element 8 is adapted to be retrofitted to the motor assembly without moving the end shield 41 relative to the frame 2.

[0029] In order to enable retrofitting of at least one electric heating element, in conjunction with the manufacture of the motor, at least one of the end shields is provided with at least one through-hole. If the electric heating element is not initially installed, the at least one through-hole can be blocked in order to increase the degree of protection of the motor assembly.

[0030] Since the operating portion of each electric heating element is adapted to pass through the corresponding through hole, the electric heating element is also adapted to be adapted without moving the end shield relative to the motor frame. The previous heating element only needs to be removed from the corresponding through hole and the new heating element is pushed through the corresponding through hole.

[0031] The operating portion of the electric heating element 8 partially overlaps the bearing 12 of the motor in the axial direction of the motor 100. In addition, the operating portion of the electric heating element 8 is located outside the bearing 12 of the motor in the radial direction of the motor 100.

[0032] The electric heating element 8 is spaced apart from the stator. Furthermore, the electric heating element 8 is spaced apart from the frame 2, the rotor, and the bearings. Thus, the heating system is adapted to heat the windings of the electric machine primarily through radiant heating. However, because the heating system inherently heats the air inside the end shields 41, heat is also transferred by convection within the electric machine 100. Furthermore, heat is also transferred by conduction through components heated by both thermal radiation and convection.

[0033] The operating portion of each of the electric heating elements 8 is in the form of a straight, elongated rod. In one embodiment, the operating portion is entirely composed of a resistor member. In another embodiment, the operating portion also includes a portion of a connecting lead, thereby ensuring that heat radiated from the resistor member reaches components inside the motor.

[0034] The operating portion of each electric heating element 8 extends parallel to a plane perpendicular to the axial direction of the motor. Therefore, the electric heating elements 8 require as little space as possible in the axial direction of the motor. In an alternative embodiment, the operating portion of at least one electric heating element extends at a rod angle relative to the plane perpendicular to the axial direction of the motor, wherein the rod angle is in the range of 0°-10°.

[0035] The operating portion of each electric heating element 8 extends parallel to the radial direction of the motor.

[0036] It will be clear to a person skilled in the art that the inventive concept can be implemented in various ways. The invention and its embodiments are not limited to the examples described above, but may vary within the scope of the claims.

Claims

1. A motor assembly provided with a heating system, the motor assembly comprising: An electric machine (100) comprising a frame (2) and two end shields (41, 42) connected to the frame (2), wherein the electric machine (100) is a rotating electric machine having a stator winding (6), and each of the end shields (41, 42) comprises a circumferential portion (48) extending in an axial direction of the electric machine (100); as well as A heating system adapted to heat the motor (100), the heating system comprising at least one electric heating element (8) having a resistor member (82) and connecting leads (84) adapted to supply power to the resistor member (82), It is characterized in that the circumferential portion (48) of at least one of the end shields (41, 42) is provided with at least one through hole (50), and the at least one electric heating element (8) extends through the at least one through hole (50), and the operating portion of the at least one electric heating element (8) located inside the end shield (41, 42) is located between the end shield (41, 42) and the stator winding (6) in the axial direction of the motor (100), wherein the operating portion of the at least one electric heating element (8) is suitable for passing through the at least one through hole (50).

2. The motor assembly according to claim 1, wherein: The operating portion of the at least one electric heating element (8) at least partially overlaps with a bearing (12) of the motor (100) in the axial direction of the motor (100).

3. The motor assembly according to claim 2, characterized in that The operating portion of the at least one electric heating element (8) is located outside the bearing (12) of the motor in the radial direction of the motor (100).

4. The motor assembly according to claim 1, wherein: The operating portion of the at least one electric heating element (8) has the form of a rectilinearly extending elongated rod.

5. The motor assembly according to claim 4, characterized in that The operating portion of the at least one electric heating element (8) extends at a rod angle relative to a plane perpendicular to the axial direction of the motor (100), wherein the rod angle is in the range of 0°-10°.

6. The motor assembly according to claim 1, wherein: The heating system comprises a first electric heating element and a second electric heating element, and the circumferential portion (48) of one of the end shields (41, 42) comprises a first through-hole (501) and a second through-hole (502) spaced apart in the circumferential direction, wherein the first electric heating element extends through the first through-hole (501) and the second electric heating element extends through the second through-hole (502).

7. The motor assembly according to claim 6, wherein: The angular distance between the first through hole (501) and the second through hole (502) is greater than or equal to 10°.

8. The motor assembly according to claim 1, wherein: The motor assembly comprises a sensor system adapted to measure the temperature and / or humidity inside at least one of the end shields (41, 42), wherein the sensor system comprises at least one sensor element (9) extending through at least one through-hole (50) provided in the circumferential portion (48) of at least one of the end shields (41, 42).

9. The motor assembly according to claim 8, characterized in that The motor assembly includes a controller (909) communicatively connected to the sensor system and adapted to control the heating system based on sensor information received from the sensor system.

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