A replaceable temperature detection unit for a motor stator

Abstract

The present invention provides a temperature detection unit (1) for a stator (41) of an electric motor (100), comprising: a plate (15), a supporting element (17), at least two legs (3, 5), and at least two temperature sensors (27, 29), wherein the temperature sensor (27, 29) is arranged on each of the legs (3, 5), respectively.

Description

Technical Field

[0001] The invention relates to a replaceable temperature detection unit for a stator of an electric motor. Background Art

[0002] Electric motors are well known and are increasingly being used to drive vehicles. Electric motors consist of a stator and a rotor. The stator comprises a number of slots into which the windings are introduced. In the winding heads the windings meet and are connected. The operation of the electric motor requires monitoring of the temperature in the stator. This can be done by measuring the temperature of the windings or the temperature of the winding heads. Summary of the invention

[0003] The object of the present invention is to provide an alternative temperature detection unit with which the temperature of the winding heads in a stator can be effectively determined.

[0004] The temperature detection unit for the stator of the motor of the present invention comprises a plate, a supporting element, at least two legs and at least two temperature sensors, and a temperature sensor is respectively arranged on each leg.

[0005] With such a design of the temperature detection unit, the temperature sensor can be removed from the stator or the carrier plate, for example after damage, or can be introduced into the stator or the carrier plate only after connection with the winding, for example.

[0006] Preferably, at least one sealing element can be arranged on the plate, wherein the sealing element has a region protruding beyond the plate.

[0007] With this sealing element, moisture penetration between the winding head and the temperature sensor can be prevented, thereby increasing operational safety.

[0008] In another embodiment of the invention, the legs may each have a groove, and at least one temperature sensor may be arranged in each of these grooves.

[0009] The groove can be open in the direction of the winding head and the temperature sensor can be inserted. Thus, on the one hand, direct contact between the winding head and the temperature sensor can be achieved, and on the other hand, the temperature sensor is surrounded by the feet on the side facing away from the winding head.

[0010] In another preferred embodiment of the invention, a further sealing element may be arranged between the plate and the supporting element.

[0011] This additional sealing element increases the board's resistance to moisture.

[0012] Preferably, a channel can extend through the support foot and the support element of the piercing plate and the conductor can be introduced into the channel.

[0013] Therefore, the temperature sensor's signal can be passed through the board to an external controller. The signal processing can then be done outside the stator or motor.

[0014] More preferably, a transverse element may be arranged between the support element and the feet, and the transverse element may space the feet apart.

[0015] For example, with spaced legs, the winding temperature can be measured on different sides of the stator. For example, one temperature measurement on the inside of the winding head and one on the outside of the winding head.

[0016] By means of spaced legs, it is also possible to measure the temperature of windings supplied by different phases of the inverter.

[0017] In another example of the invention, the temperature detection unit may have three legs with three temperature sensors. Two legs are opposite to each other and the other leg is next to one of the legs. With this arrangement, the temperature of the inner and outer diameters of the winding head and the temperature of other adjacent windings with different phase supply can be measured. This represents a combination of this embodiment of opposite legs and adjacent legs.

[0018] According to the invention, the electric motor comprises a stator with a winding head, a support plate and a temperature detection unit according to a preferred embodiment, wherein the legs adjoin the winding head and the plate is operatively connected to the support plate.

[0019] Because plate is connected with the effect of support plate, temperature sensing unit can be replaced during the life of electric motor.In addition, temperature sensing unit also can be placed after stator is finished casting.

[0020] Advantageously, when placed after casting the stator, a negative mask of the temperature detection unit is used when casting the stator.

[0021] Preferably, the transverse element can be attached to the winding head or can be partially pressed into the winding head.

[0022] The transverse element attached to the winding head ensures a defined position of the temperature sensing unit and also prevents positional variations of the temperature sensing unit. Furthermore, by means of this defined position, the accuracy of the temperature measurement can be increased, since a defined distance between the temperature sensor and the winding head is maintained.

[0023] The transverse element pressed into the winding head can improve the holding of the temperature detection unit in the carrier plate.

[0024] More preferably, the support element can be arranged in the space between the winding head and the support plate.

[0025] In this space, for example, a wiring board can be arranged, which connects the midpoints of the individual windings. The support element in this space allows, on the one hand, the location of the temperature sensor close to the winding head, and on the other hand, the temperature sensing unit can be removed from this space again, since the support element connects the board with the legs.

[0026] The vehicle of the present invention has an electric motor according to a preferred embodiment of the electric motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Several different views of the temperature detection unit are shown.

[0028] Figure 2 An inclined top view of the temperature detection unit is shown.

[0029] Figure 3 A lateral view and a top view of a temperature detection unit installed in a support plate are shown.

[0030] Figure 4 Several different views of alternative embodiments of the temperature detection unit are shown.

[0031] Figure 5 A lateral view and a top view of another temperature detection unit installed in a support plate are shown.

[0032] Figure 6 A view of an electric motor with a stator, a support plate and a temperature sensing unit is shown in a vehicle. DETAILED DESCRIPTION

[0033] Figure 1 The temperature detection unit 1 is shown in a front view, a side view, a top view and a bottom view. The temperature detection unit 1 comprises a plate 15, a support element 17, a transverse element 18 and two legs 3, 5. Sealing elements 11, 13 are arranged above and below the plate 15, respectively. The sealing elements 11, 13 protrude beyond the plate 15 on the sides 31, 33. The support element 17 extends through the plate 15 and the two sealing elements 11, 13.

[0034] Furthermore, the plate 15 and the sealing elements 11, 13 have grooves for a plurality of wires 35. The wires 35 leave the plate 15 in the direction of the legs 3, 5. The legs 3, 5 have grooves 7, 9 in which the temperature sensors are arranged. The wires 35 branch off from each other 37, 39 and are connected to the temperature sensors.

[0035] In the bottom view, two temperature sensors 27 , 29 arranged in the recesses 7 , 9 of the feet 3 , 5 can be seen.

[0036] Figure 2Shown is an inclined top view of the temperature detection unit 1. Clearly visible are the recesses 7, 9 in the two feet 3, 5 for the two temperature sensors 27, 29. The temperature sensors 27, 29 are connected via wires 35, 37, 39 to a control device, not shown.

[0037] Figure 3 The temperature sensing unit 1 is shown in cross section and in a top view, installed in a support plate 43 of an electric motor. The two legs 3, 5 surround the winding head 45 of the stator 41. The temperature sensors 27, 29 are therefore arranged near the winding head 45 on the stator 41. The transverse element 18 is pressed into the winding head 45 and fixed.

[0038] With this embodiment, the temperature of the winding at the inner and outer diameters of the winding head 45 can be measured.

[0039] Furthermore, the sealing elements 11, 13 arranged on the plate 15 are in an operative connection with the support plate 43. By means of this operative connection, moisture is prevented from penetrating into the stator 41.

[0040] For example, the diameter of the sealing elements 11 , 15 is greater than the diameter of the grooves in the plate 15 and the support plate 43 , so that the sealing elements 11 , 13 overlap the support plate 43 in the areas 31 , 33 , thereby producing a seal.

[0041] The sealing elements 11, 13 and the transverse element 18 hold the temperature detection unit 1 in the support plate 43. The sealing element is made of a flexible material, for example. In addition, the lower sealing element 13 can prevent the temperature detection unit from falling out of the support plate.

[0042] The support plate 43 also has a space 21 between the winding head 45 and the plate 15. In this area, for example, a circuit board (not shown) can be arranged. The support element 17 connects the legs 3, 5 to the plate via the transverse element 18, so that the temperature detection unit 1 can be removed from the stator 41 by pulling on the plate 15 or on the sealing element 11.

[0043] Figure 4 An alternative embodiment of the temperature detection unit 1 is shown. Figure 3 It can be seen from the comparison that the legs 3, 5 are not arranged opposite each other but are arranged adjacent to each other. Thus, the temperature sensors 27, 29 are also arranged adjacent to each other in different grooves 7, 9.

[0044] A further sealing element 19 is arranged between the plate 15 and the support element 17 , which additional sealing element increases the resistance of the plate 15 to moisture.

[0045] With this embodiment of the temperature sensing unit 1 , the temperature of the winding on one side of the stator can be measured, ie at the inner or outer diameter of the winding head.

[0046] Figure 5 An alternative embodiment of a temperature sensing unit 1 mounted in a support plate 43 of an electric motor is shown in a transverse view and a plan view. The two legs 3, 5 abut the outer diameter of a winding head 45 of the stator 41. The temperature sensors 27, 29 are therefore arranged in the vicinity of the winding head 45 on the stator 41. The transverse element 18 is pressed into the winding head 45 and fixed.

[0047] Furthermore, the sealing elements 11, 13 arranged on the plate 15 are in an operative connection with the support plate 43. By means of this operative connection, moisture is prevented from penetrating into the stator 41.

[0048] For example, the diameter of the sealing elements 11 , 15 is greater than the diameter of the grooves in the plate 15 and the support plate 43 , so that the sealing elements 11 , 13 overlap the support plate 43 in the areas 31 , 33 , thereby producing a seal.

[0049] The alternative embodiment of the sealing elements 11, 13 and the transverse element 18 holds the temperature detection unit 1 in the support plate 43. The sealing element is made of a flexible material, for example. In addition, the lower sealing element 13 can prevent the temperature detection unit from falling out of the support plate.

[0050] The support plate 43 also has a space 21 between the winding head 45 and the plate 15. In this area, for example, a circuit board (not shown) can be arranged. The support element 17 connects the legs 3, 5 to the plate via the transverse element 18, so that the temperature detection unit 1 can be removed from the stator 41 by pulling on the plate 15 or on the sealing element 11.

[0051] Of course, you can also combine Figure 1 and Figure 4 The combined embodiment has three legs and three temperature sensors, wherein the temperature can be measured both at the inner and outer diameter of the winding head and at different windings on one side.

[0052] In addition, you can also combine Figure 1 and Figure 4 The embodiment of the invention produces a temperature detection unit with four legs and four temperature sensors. This embodiment can measure the inner diameter and outer diameter of the winding head and the temperature of different windings on both sides of the winding head.

[0053] Figure 6 A vehicle 103 is shown with an electric motor 100 and a temperature detection unit 1. The temperature detection unit 1 is connected to a control unit 101 via at least one conductor 35.

Claims

1. A temperature detection unit (1) for a stator (41) of an electric motor (100), comprising: - Plate (15), - at least one sealing element (11, 13) on the plate (15), a region (31, 33) of the sealing element (11, 13) protruding out of the plate (15) and establishing an operative connection with a support plate (43), thereby preventing moisture from penetrating into the stator (41), - a supporting element (17), - at least two legs (3, 5), - at least two temperature sensors (27, 29), wherein one temperature sensor (27, 29) is arranged on each of the legs (3, 5), and a transverse element (18) which is arranged between the support element (17) and the feet (3, 5) and which spaces the feet (3, 5) apart, Therein, the support element (17) connects the feet (3, 5) to the plate (15) via the transverse element (18).

2. The temperature detection unit (1) according to claim 1, wherein the legs (3, 5) each have a groove (7, 9), and at least one temperature sensor (27, 29) is arranged in each of these grooves (7, 9).

3. The temperature detection unit (1) according to claim 1, wherein: A further sealing element (19) is arranged between the plate (15) and the support element (17).

4. The temperature detection unit (1) according to any one of the preceding claims, wherein: A channel extends through the legs (3, 5) and through a support element (17) piercing the plate (15), and a conductor (35, 37, 39) is introduced into the channel.

5. An electric motor (100) comprising a stator (41) having a winding head (45), a support plate (43) and a temperature detection unit (1) according to any of the above claims, wherein the legs (3, 5) are adjacent to the winding head (45) and the plate (15) is operatively connected to the support plate (43).

6. The electric motor (100) according to claim 5, wherein: The transverse element (18) is placed on the winding head (45) or is partially pressed into the winding head (45).

7. The electric motor (100) according to claim 5 or 6, wherein: A supporting element (17) is arranged in a space (21) between the winding head (45) and the support plate (43).

8. A vehicle having an electric motor according to any one of claims 5 to 7.

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