Motor

Abstract

The invention relates to an electric machine, comprising: a stator (10) having a plurality of stator windings; a rotor (12) which can be rotated relative to the stator (10) about an axis of rotation (D); a motor housing (14) in which the stator winding is arranged; and a plurality of phase lines (21, 22, 23) electrically connected to the stator windings. The phase lines (21, 22, 23) are guided out of the motor housing (14) from the stator windings without additional electrical contact positions.

Description

Field of the Invention

[0001] The present invention relates to an electric machine having: a stator with a plurality of stator windings; a rotor rotatable relative to the stator about a rotational axis; a machine housing in which the stator windings are arranged; and a plurality of phase lines electrically connected to the stator windings. Background Art

[0002] It is known that an electric machine is configured such that the ends of the phase lines electrically connected to the stator windings are guided inside the machine housing into a junction box, which is also referred to as a terminal box. In the junction box, the phase lines are placed and fixed on contact blocks by means of cable connectors. External supply lines are electrically connected to the phase lines in the junction box.

[0003] An electric machine with a connection device is known from DE 10 2011 108 581 B4. The connection device includes a junction box in which the connection of the phase lines of the electric machine to the supply lines is effected by means of cable connectors and screw terminals.

[0004] An electrical system including an electric machine with a junction box is known from DE 10 2007 052 445 A1.

[0005] An electric machine having a stator is known from DE 10 2023 000 728 A1. Wires extending from the stator windings are electrically connected to a rigid plate-like support. The support has contact areas for creating a plug connection. Summary of the Invention

[0006] Accordingly, it is an object of the present invention to improve an electric machine.

[0007] According to the present invention, this object is achieved by an electric machine having the features given in claim 1. Advantageous designs and improvements are the subject of the dependent claims.

[0008] The electric machine according to the present invention includes: a stator having a plurality of stator windings; a rotor rotatable relative to the stator about a rotational axis; a machine housing in which the stator windings are arranged; and a plurality of phase lines electrically connected to the stator windings. The phase lines are led out of the machine housing from the stator windings while avoiding additional electrical contact sites.

[0009] In order not to require an additional connection of the phase lines to the supply lines in a junction box when connecting the electric machine according to the present invention. The phase lines are led out of the machine housing and can be directly contacted with a power source. Thus, the time required for commissioning the electric machine according to the present invention is advantageously reduced. By eliminating contact blocks or similar connectors, the cost of the electric machine according to the present invention is also advantageously reduced.

[0010] According to an advantageous design of the present invention, the phase lines are led out from the motor housing in the radial direction.

[0011] According to another advantageous design of the present invention, the phase lines are led out from the motor housing in the axial direction. This advantageously reduces the space required by the motor in the radial direction.

[0012] According to another advantageous design of the present invention, the phase lines are led out from the motor housing in the tangential direction. This advantageously reduces the space required by the motor in the radial direction.

[0013] According to an advantageous design of the present invention, the length of the phase lines outside the motor housing is at least 100 cm, preferably at least 150 cm. The said length of the phase lines enables contact with a voltage source, which is usually arranged at a distance from the motor.

[0014] According to an advantageous design of the present invention, the motor housing has a junction box arranged in the radially outer region of the motor housing. Here, the phase lines are guided through the junction box. The junction box enables contact with additional conductors or cables.

[0015] According to an advantageous design of the present invention, the ground wire is electrically connected to the motor housing in the junction box, and the ground wire is led out from the motor housing while avoiding additional electrical contact points. For example, the star point of the motor is electrically connected to the motor housing, and the star point can be contacted outside the motor housing through the ground wire.

[0016] According to an advantageous design of the present invention, the phase lines and the ground wire are connected into a cable bundle and guided out of the motor housing together.

[0017] According to an advantageous design of the present invention, the junction box is closed by a cover plate on the side facing away from the rotor. A line opening is formed in the cover plate, and the phase lines are guided through the line opening. The cover plate is detachably placed on the junction box. Thus, the junction box can be opened.

[0018] According to an advantageous design of the present invention, at least one screw terminal for connecting a sensor cable is mounted on the cover plate. A cable opening is also formed in the cover plate, and the sensor cable can be guided through the cable opening. For example, the motor includes a temperature sensor, which is arranged near the stator winding and is connected to the screw terminal inside the motor housing by means of a sensor line. Thus, by connecting the sensor cable to the screw terminal, the evaluation of the sensor can be achieved outside the motor housing.

[0019] Further advantages are given by the dependent claims. The invention is not limited to the feature combinations of the claims. For a person skilled in the art, in particular from the object set and / or by comparison with the prior art, other reasonable combination possibilities of the claims and / or the features of individual claims and / or the features of the description and / or the features of the drawings can be obtained. Description of the Drawings

[0020] The present invention will be described in detail below with reference to the drawings. The invention is not limited to the embodiments shown in the drawings. The drawings only schematically show the subject matter of the invention. Among them:

[0021] Figure 1 A front half-sectional view showing the electric machine;

[0022] Figure 2 A side view showing the electric machine without the cover plate;

[0023] Figure 3 A perspective view showing the cover plate.

[0024] List of Reference Numerals:

[0025] 10 Stator

[0026] 12 Rotor

[0027] 14 Electric machine housing

[0028] 21 First phase line

[0029] 22 Second phase line

[0030] 23 Third phase line

[0031] 25 Ground line

[0032] 27 Cable harness

[0033] 30 Junction box

[0034] 31 Cover plate

[0035] 32 Line opening

[0036] 34 Cable opening

[0037] 35 Spiral terminal

[0038] 41 Cable conduit

[0039] 42 Fastening strap

[0040] 43 Blind screw

[0041] 44 Seal

[0042] 45 Fastening screw

[0043] 46 Contact screw

[0044] Axis of rotation D Detailed implementation manner

[0045] Figure 1 A half-sectional front view of the motor is shown. The motor is an electrical device and includes a stator 10 and a rotor 12. The rotor 12 can rotate relative to the stator 10 about the axis of rotation D. The present invention relates to a star-connected three-phase AC motor.

[0046] The stator 10 has a plurality of stator windings (not shown here), which are wound with electrical wires. For example, the electrical wires are coated with an insulating paint layer. The motor includes a plurality of phase lines 21, 22, 23 electrically connected to the stator windings. In the present invention, the motor includes a first phase line 21, a second phase line 22, and a third phase line 23.

[0047] The stator 10 has a stator core. The stator core includes a plurality of annular stator sheets / stator laminations welded to each other. The stator core is designed as a hollow cylinder and has a plurality of slots or a plurality of teeth on its inward-facing surface. The stator 10 has a winding frame made of an electrically insulating material. The winding frame surrounds the slots or teeth of the stator core. The winding frame carries the stator windings.

[0048] The motor includes 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 junction box 30. The junction box 30 is arranged in the radially outer region of the motor housing 14.

[0049] The phase lines 21, 22, 23 are led out of the motor housing 14 from the stator windings while avoiding additional electrical contact points. That is, the phase lines 21, 22, 23 are led from the stator windings through the motor housing to the outside of the motor housing 14. The phase lines 21, 22, 23 are led through the junction box 30. There is no electrical contact of the phase lines 21, 22, 23 in the junction box 30.

[0050] The motor includes an earth wire 25. The earth wire 25 is electrically connected to the star connection point of the motor. The phase lines 21, 22, 23 and the earth wire 25 are connected into a cable bundle 27 and are led out of the motor housing 14 together. Currently, the lengths of the phase lines 21, 22, 23 and the earth wire 25 outside the motor housing 14 are about 150 cm. A cable joint is installed at the end of the phase lines 21, 22, 23 and the earth wire 25 facing away from the motor housing 14.

[0051] The electric machine includes a cover plate 31. The terminal box 30 is closed by the cover plate 31 on the side facing away from the rotor 12 and the axis of rotation D (i.e., radially outside). The cover plate 31 is mechanically connected to the electric machine housing 14 by means of a plurality of fastening screws 45 (the fastening screws 45 are screwed into the electric machine housing 14) with a seal 44 arranged in the middle.

[0052] A line opening 32 is formed in the cover plate 31. A hollow cylindrical cable conduit 41 is mounted on the line opening 32. The phase lines 21, 22, 23 and the ground line 25 are led out of the electric machine housing 14 from the terminal box 30 through the line opening 32 and the cable conduit 41.

[0053] Currently, the phase lines 21, 22, 23 and the ground line 25 are led out of the electric machine housing 14 in the radial direction. It is also conceivable that the phase lines 21, 22, 23 and the ground line 25 are led out of the electric machine housing 14 in the axial direction or in the tangential direction.

[0054] A cable opening 34 is also formed in the cover plate 31. The cable opening 34 is used to lead a sensor cable out of the electric machine housing 14 from the terminal box 30. Currently, no sensor cable is provided. Therefore, the cable opening 34 is closed by a blind screw 43 screwed into the cable opening 34.

[0055] The electric machine includes a spiral terminal clamp 35 and a fastening strap 42. The fastening strap 42 is fastened to the cover plate 31, here tightened onto the cover plate. The spiral terminal clamp 35 is mounted on the fastening strap 42. Therefore, the spiral terminal clamp 35 is mounted on the cover plate 31 by means of the fastening strap 42.

[0056] Figure 2 A side view of the illustrated electric machine without the cover plate 31 is shown. The ground line 25 is electrically connected to the electric machine housing 14 in the terminal box 30. For this purpose, a cable connector is mounted at the end of the ground line 25 facing the electric machine housing 14. The cable connector is electrically and mechanically connected to the electric machine housing 14 by means of a contact screw 46 screwed into the electric machine housing 14. Figure 1 Here, the ground line 25 is led out of the electric machine housing 14 while avoiding additional electrical contact points. Therefore, the ground line 25 starts to be led through the terminal box 30 to the outside of the electric machine housing 14. The ground line 25 has no other electrical contact points.

[0057] The star connection point of the electric machine is electrically connected to the electric machine housing 14. The ground line 25 is electrically connected to the electric machine housing 14 as well. Therefore, the ground line 25 is electrically connected to the star connection point of the electric machine. The star connection point of the electric machine can be contacted via the ground line outside the electric machine housing 14.

[0058]

[0059] Figure 3 Figure 1 Shown is Figure 1Perspective view of the cover plate 31 shown. Also shown are the fastening screws 45 passing through the cover plate 31. As already mentioned, the screw terminal 35 is mounted on the cover plate 31 by means of the fastening strap 42.

[0060] The electric motor includes a temperature sensor not shown here. The temperature sensor is arranged in the motor housing 14 near the stator winding and is connected to the screw terminal 14 inside the motor housing 14 by a sensor line not shown here.

[0061] The screw terminal 35 is used to connect the sensor cable. The sensor cable connected to the screw terminal 35 is electrically connected to the temperature sensor via the sensor line. The sensor cable can be led out from the junction box 30 through the cable opening 34 and thus out of the motor housing 14. By connecting the sensor cable to the screw terminal 35, the sensor can thus be evaluated outside the motor housing.

Claims

1. A motor, comprising: a stator (10) having a plurality of stator windings, a rotor (12) rotatable relative to the stator (10) about a rotational axis (D), a motor housing (14) in which the stator windings are arranged, and a plurality of phase lines (21, 22, 23) electrically connected to the stator windings, characterized in that the phase lines (21, 22, 23) are led out of the motor housing (14) from the stator windings while avoiding additional electrical contact points.

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

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

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

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

6. The motor according to any one of the preceding claims, characterized in that the motor housing (14) has a terminal box (30) arranged in a radially outer region of the motor housing (14), and the phase lines (21, 22, 23) are led through the terminal box (30).

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

8. The motor according to claim 7, characterized in that the phase lines (21, 22, 23) and the ground line (25) are connected into a cable bundle (27) and led out of the motor housing (14) together.

9. The motor according to any one of claims 6 to 8, characterized in that the terminal box (30) is closed by a cover plate (31) on a side facing away from the rotor (12), and a line opening (32) is formed in the cover plate (31), through which the phase lines (21, 22, 23) are led.

10. The motor according to claim 9, characterized in that at least one screw terminal (35) for connecting a sensor cable is mounted on the cover plate (31), and a cable opening (34) is further formed in the cover plate (31), through which the sensor cable can be led.

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