Electric motor having a sensor configured to measure variables of the coils of the motor
An electric motor, in particular for a kitchen machine, is proposed, wherein the stator of the electric motor has a stator core, a plurality of coils and a coil carrier. The coil carrier is produced in one piece by injection molding onto the stator core and has at least one holder arranged radially on the outside of the stator core, the holder holding a connection device and/or a sensor device. Further, a kitchen machine having a corresponding electric motor is proposed. Furthermore, a method of manufacturing an electric motor is proposed, in which a coil carrier of the stator is produced by injection molding to a stator core, the coil carrier being produced with at least one holder arranged radially outside the stator core and adapted to hold a connection device and/or a sensor device.
1 . An electric motor comprising:
a rotor and a stator, the rotor being rotatable about a rotation axis relative to the stator,
wherein the stator comprises a stator core, a plurality of coils, and a coil carrier for the coils,
wherein the coil carrier is produced in one piece by injection molding onto the stator core and has at least one holder arranged radially on the outside of the stator core, the holder holding a sensor device,
wherein the holder comprises a radial portion and an axial portion, the holder engaging around the stator core with the axial portion and the radial portion,
wherein the radial portion extends radially outwardly along an axial end face of the stator core, and wherein the axial portion extends along an outer side of the stator core,
wherein the sensor device comprises a sensor configured to measure variables of the coils, and
wherein the sensor is held by the holder and arranged axially above the coils.
2 . The electric motor according to claim 1 , wherein the sensor device comprises a temperature sensor and/or a Hall sensor.
3 . The electric motor according to claim 1 , wherein the sensor device or a sensor plate of the sensor device is heat staked to the holder.
4 . The electric motor according to claim 1 , wherein the holder forms a cable retainer for a cable of the sensor device.
5 . The electric motor according to claim 1 , wherein the coil carrier is materially and/or adhesively bonded to the stator core.
6 . The electric motor according to claim 1 , wherein the coil carrier engages around the stator core and/or forms a form fit with the stator core in the axial direction, in the radial direction and in the circumferential direction.
7 . The electric motor according to claim 1 , wherein the coil carrier has a plurality of holders spaced apart from one another, which are each arranged radially on the outside of the stator core.
8 . The electric motor according to claim 7 , wherein one of the plurality of holders is formed as a connection holder and holds a connection device, and wherein another one of the plurality of holders is formed as a sensor holder and holds the sensor device.
9 . The electric motor according to claim 1 ,
wherein the stator has exactly twelve coils and/or the stator core has exactly twelve stator teeth for the coils.
10 . The electric motor according to claim 1 , wherein the stator core has at least one of:
an inner diameter of at least 70 mm and at most 85 mm,
an outer diameter of at least 120 mm and at most 165 mm,
a height of at least 15 mm and at most 25 mm, or
a yoke thickness of at least 6 mm and at most 12 mm.
11 . The electric motor according to claim 1 , wherein the stator core has a plurality of stator teeth, with at least one of:
each stator tooth having a radial extent of at least 10 mm and at most 22 mm and/or an extent in the circumferential direction of at least 10 mm and at most 20 mm, or
a slot being formed between each two stator teeth, which slot has a width of at least 3 mm and at most 6 mm.
12 . The electric motor according to claim 1 , wherein the stator core is formed by at least 35 and at most 45 stacked stator sheets.
13 . The electric motor according to claim 1 , wherein the coils each have at least 150 turns and at most 190 turns and/or a bare wire diameter of at least 0.2 mm and at most 0.6 mm.
14 . The electric motor according to claim 1 , wherein the coil carrier is made of polyamide.
15 . The electric motor according to claim 1 , wherein the electric motor comprises a connection device held by the holder or by a second holder of the coil carrier.
16 . The electric motor according to claim 15 , wherein the connection device comprises electrical connection contacts for the coils and/or a star point of an interconnection of the coils.
17 . The electric motor according to claim 15 , wherein the connection device comprises a terminal forming a star point of an interconnection of the coils.
18 . A kitchen machine comprising:
an electric motor,
the electric motor having a rotor and a stator, the rotor being rotatable about a rotation axis relative to the stator,
the stator comprising a stator core, a plurality of coils, and a coil carrier for the coils,
wherein the coil carrier is produced in one piece by injection molding onto the stator core and has at least one holder arranged radially on the outside of the stator core, the holder holding a sensor device,
wherein the holder comprises a radial portion and an axial portion, the holder engaging around the stator core with the axial portion and the radial portion,
wherein the radial portion extends radially outwardly along an axial end face of the stator core, and wherein the axial portion extends along an outer side of the stator core,
wherein the sensor device comprises a sensor configured to measure variables of the coils, and
wherein the sensor is held by the holder and arranged axially above the coils.
19 . A method of manufacturing an electric motor having a stator and a rotor rotatable relative to the stator about a rotation axis, comprising:
producing a coil carrier of the stator by injection molding onto a stator core, the coil carrier being produced with at least one holder which is arranged radially on the outside of the stator core and is designed to hold a sensor device,
producing the holder to comprise a radial portion and an axial portion, the holder engaging around the stator core with the axial portion and the radial portion, the radial portion extending radially outwardly along an axial end face of the stator core, and the axial portion extending along an outer side of the stator core,
providing the sensor device with a sensor configured to measure variables of the coils, the sensor being held by the holder and arranged axially above the coils.
20 . The method according to claim 19 , further comprising producing the coil carrier in such a way that it engages around the stator core and/or is materially and/or adhesively bonded to the stator core and/or forms a form fit with the stator core in the axial direction, in the radial direction and in the circumferential direction.
21 . The method according to claim 19 , further comprising heat staking the sensor device or a sensor plate of the sensor device to the holder.
22 . An electric motor comprising:
a rotor and a stator, the rotor being rotatable about a rotation axis relative to the stator,
wherein the stator comprises a stator core, a plurality of coils, and a coil carrier for the coils,
wherein the coil carrier is a one piece injection molded design molded onto the stator core and has a plurality of holders arranged radially on the outside of the stator core,
wherein each holder comprises a respective radial portion and a respective axial portion, each holder engaging around the stator core with the respective axial portion and the respective radial portion,
wherein each radial portion extends radially outwardly along a respective axial end face of the stator core, and wherein each axial portion extends along a respective outer side of the stator core,
a sensor device mounted on at least one holder,
a connection block with one or more electrical connections that supply energy to the electric motor mounted on another one of the at least one holders,
wherein the sensor device comprises a sensor configured to measure variables of the coils, and
wherein the sensor is held by the respective holder and arranged axially above the coils.