Electric motor

Abstract

An electric motor according to the invention comprises a stator (10) having a plurality of stator windings, and a rotor (12) able to rotate relative to the stator (10) about an axis of rotation (D), and a motor housing (14) in which the stator windings are arranged, and a plurality of phase conductors (21, 22, 23) that are electrically connected to the stator windings. The phase conductors (21, 22, 23) are guided out of the motor housing (14) by the stator windings, avoiding additional electrical contact points.

Description

[0001] electric motor

[0002] Description:

[0003] The invention relates to an electric motor comprising a stator having a plurality of stator windings, and a rotor rotatable about a rotation axis relative to the stator, a motor housing in which the stator windings are arranged, and a plurality of phase conductors electrically connected to the stator windings.

[0004] Conventional electric motors are designed in such a way that the ends of the phase conductors, which are electrically connected to the stator windings, are routed inside the motor housing into a terminal box, also known as a terminal box. In the terminal box, the phase conductors are connected and secured to a contact block using cable lugs. External supply lines are electrically connected to the phase conductors in the terminal box.

[0005] DE 102011 108 581 B4 discloses an electric motor with a connection arrangement. The connection arrangement comprises a terminal box in which the phase conductors of the electric motor are connected to the supply lines using cable lugs and screw terminals.

[0006] From DE 102007 052 ​​445 A1 an electrical system is known which comprises an electric motor with a terminal box.

[0007] DE 102023 000 728 A1 discloses an electric motor with a stator. Wires protrude from the stator windings and are electrically connected to a rigid plate-shaped support. The support has contact areas for establishing plug connections.

[0008] The invention is based on the object of developing an electric motor.

[0009] The object is achieved according to the invention by an electric motor having the features specified in claim 1. Advantageous embodiments and further developments are the subject of the subclaims.

[0010] ISI \ EIDOPAT 14.10.2024 An electric motor according to the invention comprises a stator having a plurality of stator windings, a rotor rotatable about a rotational axis relative to the stator, a motor housing in which the stator windings are arranged, and a plurality of phase conductors electrically connected to the stator windings. The phase conductors are routed from the stator windings out of the motor housing, avoiding additional electrical contact points.

[0011] To connect an electric motor according to the invention, an additional connection of the phase conductors to supply lines in a terminal box is not required. The phase conductors protrude from the motor housing and can be directly connected to a voltage source. This advantageously reduces the time required to commission the electric motor according to the invention. By eliminating contact blocks or similar connectors, the costs of an electric motor according to the invention are also advantageously reduced.

[0012] According to an advantageous embodiment of the invention, the phase conductors are led out of the motor housing in a radial direction.

[0013] According to another advantageous embodiment of the invention, the phase conductors are routed axially out of the motor housing. This advantageously reduces the space required by the electric motor in the radial direction.

[0014] According to another advantageous embodiment of the invention, the phase conductors are routed out of the motor housing in a tangential direction. This advantageously reduces the space required by the electric motor in the radial direction.

[0015] According to an advantageous embodiment of the invention, the length of the phase conductors outside the motor housing is at least 100 cm, preferably at least 150 cm. This length of the phase conductors enables contact with a voltage source located at a conventional distance from the electric motor.

[0016] According to an advantageous embodiment of the invention, the motor housing has a

[0017] The terminal box is located in a radially outer area of ​​the motor housing. The phase conductors are routed through the terminal box. The terminal box allows for the connection of additional conductors or cables.

[0018] According to an advantageous embodiment of the invention, a ground conductor in the terminal box is electrically connected to the motor housing, and the ground conductor is routed out of the motor housing, avoiding additional electrical contact points. For example, a star point of the electric motor is electrically connected to the motor housing, and the star point can be contacted outside the motor housing via the ground conductor.

[0019] According to an advantageous embodiment of the invention, the phase conductors and the earth conductor are connected to form a cable harness and are led out of the motor housing together.

[0020] According to an advantageous embodiment of the invention, the terminal box is closed with a cover plate on the side facing away from the rotor. A conductor opening is provided in the cover plate through which the phase conductors are routed. The cover plate is removably mounted on the terminal box. This allows the terminal box to be opened.

[0021] According to an advantageous embodiment of the invention, at least one screw terminal for connecting a sensor cable is attached to the cover plate. A cable opening through which a sensor cable can be passed is also provided in the cover plate. For example, the electric motor comprises a temperature sensor, which is arranged near the stator windings and connected to the screw terminal by means of a sensor cable inside the motor housing. Connecting the sensor cable to the screw terminal thus enables evaluation of the sensor outside the motor housing.

[0022] The invention is not limited to the combination of features in the claims. Further possible combinations of claims and / or individual claim features and / or features of the description and / or the figures will become apparent to those skilled in the art, particularly from the task and / or the problem posed by comparison with the prior art. The invention will now be explained in more detail with reference to figures. The invention is not limited to the exemplary embodiments shown in the figures. The figures represent the subject matter of the invention only schematically. They show:

[0023] Figure 1 : a partially sectioned front view of an electric motor,

[0024] Figure 2: a side view of the electric motor without cover plate and

[0025] Figure 3: a perspective view of a cover plate.

[0026] Figure 1 shows a partially sectioned front view of an electric motor. The electric motor is an electrical machine and comprises a stator 10 and a rotor 12. The rotor 12 is rotatable about an axis of rotation D relative to the stator 10. In this case, it is a three-phase AC motor in a star connection.

[0027] The stator 10 has a plurality of stator windings (not shown here) wound from electrically conductive wires. The wires are coated, for example, with an insulating lacquer layer. The electric motor comprises a plurality of phase conductors 21, 22, 23, which are electrically connected to the stator windings. In the present case, the electric motor comprises a first phase conductor 21, a second phase conductor 22, and a third phase conductor 23.

[0028] The stator 10 has a stator core. The stator core comprises a plurality of welded-together annular stator laminations. The stator core is hollow-cylindrical in design and has a plurality of slots or a plurality of teeth on its inward-facing surface. The stator 10 has a winding support made of an electrically insulating material. The winding support surrounds the slots or teeth of the stator core. The winding support carries the stator windings.

[0029] The electric motor comprises a motor housing 14. The stator core and the stator windings are arranged in the motor housing 14. The stator core 12 and the stator windings coaxially surround the axis of rotation D and the rotor 12. The motor housing 14 has a terminal box 30. The terminal box 30 is arranged in a radially outer region of the motor housing 14. The phase conductors 21, 22, 23 are led from the stator windings out of the motor housing 14, avoiding additional electrical contact points. The phase conductors 21, 22, 23 are therefore led continuously, starting at the stator windings, to the outside of the motor housing 14. The phase conductors 21, 22, 23 are led through the terminal box 30. There is no electrical contact between the phase conductors 21, 22, 23 in the terminal box 30 either.

[0030] The electric motor includes a ground conductor 25. The ground conductor 25 is electrically connected to a star point of the electric motor. The phase conductors 21, 22, 23 and the ground conductor 25 are connected to a cable harness 27 and are jointly routed out of the motor housing 14. The length of the phase conductors 21, 22, 23 and the ground conductor 25 outside the motor housing 14 is approximately 150 cm in this case. A cable lug is attached to each end of the phase conductors 21, 22, 23 and the ground conductor 25 facing away from the motor housing 14.

[0031] The electric motor comprises a cover plate 31. The terminal box 30 is closed with the cover plate 31 on a side facing away from the rotor 12 and the rotation axis D, i.e., radially outward. The cover plate 31 is mechanically connected to the motor housing 14 by means of several fastening screws 45, which are screwed into the motor housing 14, with a seal 44 interposed.

[0032] A conductor opening 32 is provided in the cover plate 31. A hollow cylindrical cable gland 41 is attached to the conductor opening 32. The phase conductors 21, 22, 23 and the ground conductor 25 are led from the terminal box 30 through the conductor opening 32 and the cable gland 41 out of the motor housing 14.

[0033] In this case, the phase conductors 21, 22, 23 and the ground conductor 25 are routed out of the motor housing 14 in a radial direction. It is also conceivable for the phase conductors 21, 22, 23 and the ground conductor 25 to be routed out of the motor housing 14 in an axial direction or in a tangential direction.

[0034] A cable opening 34 is also provided in the cover plate 31. The cable opening 34 serves to pass a sensor cable from the terminal box 30 out of the motor housing 14. In this case, no sensor cable is provided. The cable opening 34 is therefore closed with a cover screw 43, which is screwed into the cable opening 34. The electric motor comprises a screw terminal 35 and a fastening strip 42. The fastening strip 42 is fastened to the cover plate 31, in this case screwed. The screw terminal 35 is attached to the fastening strip 42. The screw terminal 35 is thus attached to the cover plate 31 by means of the fastening strip 42.

[0035] Figure 2 shows a side view of the electric motor shown in Figure 1 without the cover plate 31. The ground conductor 25 is electrically connected to the motor housing 14 in the terminal box 30. For this purpose, a cable lug is attached to an end of the ground conductor 25 facing the motor housing 14. The cable lug is electrically and mechanically connected to the motor housing 14 by means of a contact screw 46, which is screwed into the motor housing 14.

[0036] The ground conductor 25 is routed out of the motor housing 14, avoiding additional electrical contact points. The ground conductor 25 is thus routed continuously from the terminal box 30 to the outside of the motor housing 14. There is no further electrical contact for the ground conductor 25.

[0037] The star point of the electric motor is electrically connected to the motor housing 14. The ground conductor 25 is electrically connected to the motor housing 14. Thus, the ground conductor 25 is electrically connected to the star point of the electric motor. The star point of the electric motor can be contacted outside the motor housing 14 via the ground conductor.

[0038] Figure 3 shows a perspective view of the cover plate 31 shown in Figure 1. The fastening screws 45, which penetrate the cover plate 31, are also shown. As already mentioned, the screw terminal 35 is attached to the cover plate 31 by means of the fastening strip 42.

[0039] The electric motor includes a temperature sensor (not shown here). The temperature sensor is located near the stator windings in the motor housing 14 and is connected to the screw terminal 14 within the motor housing 14 by means of a sensor cable (not shown here).

[0040] The screw terminal 35 is used to connect a sensor cable. A sensor cable connected to the screw terminal

[0041] The sensor cable connected to terminal 35 is electrically connected to the temperature sensor via the sensor cable. The sensor cable can be routed through the cable opening 34 out of the terminal box 30 and thus out of the motor housing 14. Connecting the sensor cable to screw terminal 35 thus enables evaluation of the sensor outside the motor housing.

[0042] List of reference symbols

[0043] 10 Stator

[0044] 12 Rotor

[0045] 14 Engine housing

[0046] 21 first phase conductor

[0047] 22 second phase conductor

[0048] 23 third phase conductor

[0049] 25 earth conductors

[0050] 27 Wiring harness

[0051] 30 junction box

[0052] 31 Cover plate

[0053] 32 ladder opening

[0054] 34 Cable opening

[0055] 35 screw terminal

[0056] 41 cable gland

[0057] 42 fastening strips

[0058] 43 Cover screw

[0059] 44 Seal

[0060] 45 fixing screw

[0061] 46 Contact screw D Rotation axis

Claims

Patent claims:

1. Electric motor, comprising a stator (10) which has a plurality of stator windings, and a rotor (12) which is rotatable about an axis of rotation (D) relative to the stator (10), and a motor housing (14) in which the stator windings are arranged, and a plurality of phase conductors (21, 22, 23) which are electrically connected to the stator windings, characterized in that the phase conductors (21, 22, 23) are led out of the motor housing (14) from the stator windings, avoiding additional electrical contact points.

2. Electric motor according to claim 1, characterized in that the phase conductors (21, 22, 23) are led out of the motor housing (14) in the radial direction.

3. Electric motor according to claim 1, characterized in that the phase conductors (21, 22, 23) are led out of the motor housing (14) in the axial direction.

4. Electric motor according to claim 1, characterized in that the phase conductors (21, 22, 23) are led out of the motor housing (14) in a tangential direction.

5. Electric motor according to the preceding claims, characterized in that a length of the phase conductors (21, 22, 23) outside the motor housing (14) is at least 100 cm, preferably at least 150 cm.

6. Electric motor according to the preceding claims, characterized in that the motor housing (14) has a terminal box (30) which is arranged in a radially outer region of the motor housing (14), and in that the phase conductors (21, 22, 23) are guided through the terminal box (30).

7. Electric motor according to claim 6, characterized in that an earth conductor (25) in the terminal box (30) is electrically connected to the motor housing (14), and that the earth conductor (25) is led out of the motor housing (14) while avoiding additional electrical contact points.

8. Electric motor according to claim 7, characterized in that the phase conductors (21, 22, 23) and the earth conductor (25) are connected to form a cable harness (27) and are led out together from the motor housing (14).

9. Electric motor according to claims 6 to 8, characterized in that the terminal box (30) is provided on a side facing away from the rotor (12) with a cover plate (31) is closed, and that a conductor opening (32) is made in the cover plate (31) through which the phase conductors (21, 22, 23) are led.

10. Electric motor according to claim 9, characterized in that at least one screw terminal (35) for connecting a sensor cable is attached, and that a cable opening (34) is made in the cover plate (31) through which a sensor cable can be passed.

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