Electric motor device

Abstract

The invention proceeds from an electric motor device (10a; 10b; 10c) having a stator (12a; 12b; 12c) which has a first winding (14a; 14b; 14c) and at least one second winding (16a; 16b; 16c) for operation by way of at least two different supply voltages and has at least one stator tooth (18a; 18b; 18c), wherein a first winding region (20a; 20b; 20c) for the first winding (14a; 14b; 14c) and at least one second winding region (22a; 22b; 22c) for the second winding (16a; 16b; 16c) are arranged on the stator tooth (18a; 18b; 18c). It is proposed that the stator (12a; 12b; 12c) has a wall (40a; 40b; 40c) separating the first winding region (20a; 20b; 20c) and the second winding region (22a; 22b; 22c).

Description

[0001] Description

[0002] title

[0003] State of the art

[0004] US 2019229599 A1 discloses an electric motor that can be operated by alternating current and direct current. In particular, it has already been proposed that the electric motor have a stator with two different windings, which can be arranged on the same stator tooth.

[0005] Disclosure of the invention

[0006] The invention is based on an electric motor device with a stator which has a first winding and at least one second winding for operation by at least two different supply voltages and at least one stator tooth, wherein a first winding region for the first winding and at least one second winding region for the second winding are arranged on the stator tooth.

[0007] It is proposed that the stator has a wall which separates the first winding region and the second winding region.

[0008] Such an embodiment of the invention advantageously improves a generic device. In particular, safety can be advantageously increased, in particular the windings can be electrically insulated from one another particularly reliably. Furthermore, a particularly compact design of the stator can be provided in that electrical insulation, in particular in accordance with a predetermined safety standard, can be achieved with a reduced safety distance, in particular with a reduced creepage distance and / or air gap, in particular at least between the first and the second winding. Furthermore, assembly of the windings through the wall can advantageously be simplified, in particular by advantageously preventing slipping of the windings in a direction relative to the wall. Furthermore, stability of the stator, in particular a position of the windings in the stator, can advantageously be increased.In addition, a wired mains operation and a wireless battery operation of the electric motor device can be provided particularly advantageously, whereby in particular flexibility, for example with regard to free movement of the electric motor device, and / or a longer service life, in particular even with high required output powers of more than 1.5 kW, can be achieved.

[0009] The wall is designed, in particular, as an electrically insulating wall. The wall is intended, in particular, to electrically insulate the first winding and the second winding from one another. The wall is made, in particular, of an electrically insulating material, preferably of a plastic.

[0010] The electric motor device is preferably part, in particular a subassembly, of an electric motor. The electric motor with the electric motor device is designed in particular as a brushless DC motor. In addition to the electric motor device, the electric motor in particular has at least one rotor. It would be conceivable for the electric motor device to have the rotor. The electric motor and in particular the electric motor device are preferably part of a handheld power tool. The handheld power tool can, for example, be designed as a hammer drill, a drill, a screwdriver, a cut-off grinder, a circular saw, a grinder or any other handheld power tool that would be deemed appropriate to a person skilled in the art. The stator in particular has an axial direction that runs along the axis of rotation of the rotor in the electric motor and / or the electric motor device.

[0011] The two different supply voltages comprise, in particular, a first supply voltage and a second supply voltage. Preferably, the first winding is provided for supply by the first supply voltage and the second winding is provided for supply by the second supply voltage. The first supply voltage is preferably based on an alternating current. The second supply voltage is preferably based on a direct current. Alternatively, it would be conceivable for the first supply voltage to be based on a direct current and / or the second supply voltage to be based on an alternating current. The first and second supply voltages are preferably direct currents. The handheld power tool has, in particular, two energy sources for providing the different supply voltages.The handheld power tool preferably has a power connector, in particular for plugging into a household socket, for providing the first supply voltage. The first supply voltage is preferably based on a mains voltage, for example 230 V or 120 V. The handheld power tool preferably has at least one energy storage device, in particular a rechargeable battery and / or a battery, and / or has an interface for connecting to the energy storage device. The energy storage device is preferably designed as a handheld tool battery pack. The energy storage device and / or the interface is / are preferably provided for providing the second supply voltage. The second supply voltage can have a voltage value typical for an energy storage device, in particular a handheld tool battery pack, and for example a voltage value of 18 V or 20 V.In particular, the second supply voltage has a lower voltage value than a voltage value of the first supply voltage.

[0012] The handheld power tool and / or the electric motor and / or the electric motor device preferably has / have at least one processing unit, which in particular comprises at least one power electronics unit. The processing unit is preferably provided to adapt at least one of the supply voltages for operation. The processing unit preferably provides at least one three-phase current. The first supply voltage is preferably a voltage processed by the processing unit from the alternating voltage. The second supply voltage is preferably a voltage processed by the processing unit from the direct voltage. The processing unit can have at least one rectifier and one inverter for providing the first supply voltage and / or at least one inverter for providing the second supply voltage.The processing unit can in particular be provided to process currents from a plurality of energy storage devices and in particular to provide a supply voltage which has a value of a sum of the voltages respectively provided by the energy storage devices, for example an integer multiple of 18 V or 20 V.

[0013] The first and second windings preferably have different wire cross-sections and / or different winding counts. The second winding preferably has a larger wire cross-sectional area than the first winding, in particular for supplying the second supply voltage based on the DC voltage. A control unit of the handheld power tool and / or the electric motor and / or the electric motor device is preferably provided to prioritize a power supply via the power connector for operating the electric motor. This advantageously allows energy to be saved in the energy storage device for a power supply via the power connector.

[0014] The winding is, in particular, a winding of a wire around just one stator tooth. Preferably, the stator has a plurality of first and / or second windings, in particular each of which is identical to one another, on a plurality of stator teeth of the stator, wherein the entirety of the first and / or second windings is, in particular, part of a first and / or second stator winding of the stator. Preferably, a first and a second winding are arranged on each stator tooth. In particular, the first stator winding is provided for supply by the first supply voltage and the second stator winding is provided for supply by the second supply voltage. The stator teeth are preferably arranged along a circumferential direction of the stator, in particular with respect to the axial direction of the stator.

[0015] It is further proposed that the stator have at least one further stator tooth and a winding body for at least partially receiving the first winding, which is arranged at least in section between the stator tooth and the further stator tooth. As a result, at least the first winding can be arranged particularly stably on the stator tooth. The winding body is preferably arranged at least partially in the first winding region and in particular comprises this at least partially. In particular, the first winding region can be advantageously provided. Preferably, the winding body is intended to completely receive the first winding. The winding body preferably completely comprises at least the first winding region.The further stator tooth is preferably a stator tooth adjacent to the stator tooth, wherein the further stator tooth is particularly designed as a stator tooth closest to the stator tooth. The winding body preferably comprises an electrically insulating material, in particular plastic, and / or is formed from at least a large part, in particular at least 55%, advantageously at least 65%, preferably at least 75%, particularly preferably at least 85%, and particularly advantageously at least 95%, of a mass and / or volume fraction of the winding body.

[0016] It is further proposed that the stator have at least one further first winding, which is at least partially wound on the winding body. In particular, a further first winding region for the further first winding is arranged on the further stator tooth. Advantageously, the further first winding can be arranged particularly stably on the further stator tooth. In particular, the winding body can particularly efficiently have more than one first winding region at least partially. The winding body is preferably at least partially arranged in the further first winding region and in particular has this at least partially. Preferably, the winding body is provided to completely accommodate the further first winding. The winding body preferably completely has the further first winding region. In particular, the further first winding is provided to be supplied by the first supply voltage.

[0017] It would be conceivable for the winding body to be arranged at least in sections only between the stator tooth and the further stator tooth and in particular to be intended only for winding by the first and the further first winding. However, the winding body is preferably arranged at least in sections between at least three stator teeth. The winding body is preferably arranged at least in sections between all adjacent stator teeth. The winding body preferably has a circular circumference, at least as viewed in the axial direction of the stator. The winding body is preferably intended to be inserted at least in sections from the front and / or rear between the stator teeth, in particular between all stator teeth simultaneously, with respect to the axial direction of the stator.The winding body can be designed in two parts, at least for assembly of the stator, and in particular can be designed to be inserted between the stator teeth simultaneously from the front and rear during assembly. Preferably, the stator has only one winding body for winding around at least the first stator winding.

[0018] It is also proposed that the stator have at least one further winding body for at least partially accommodating the second winding, which is arranged at least in section between the stator tooth and the further stator tooth. As a result, the second winding can be arranged particularly stably on the stator tooth. The further winding body is preferably arranged at least partially in the second winding region and in particular comprises this at least partially. In particular, the first and the second winding region can advantageously be provided on separate winding bodies, whereby in particular a separation of the first and second windings and in particular of the different supply voltages can be provided particularly efficiently. The further winding body is preferably provided to completely accommodate the second winding.The further winding body comprises at least the second winding region, in particular completely. The further winding body preferably comprises an electrically insulating material, in particular plastic, and / or is formed from this material at least to a large extent, in particular to at least 55%, advantageously at least 65%, preferably at least 75%, particularly preferably at least 85% and particularly advantageously at least 95% of a mass and / or volume fraction of the further winding body. It is further proposed that the stator comprise a further second winding, which is at least partially wound onto the further winding body. In particular, a further second winding region for the further second winding is arranged on the further stator tooth. The further second winding can advantageously be arranged particularly stably on the further stator tooth.In particular, the additional winding body can particularly efficiently comprise more than one second winding region, at least partially. The additional winding body is preferably arranged at least partially in the additional second winding region and, in particular, comprises it at least partially. The additional winding body is preferably provided to completely accommodate the additional second winding. The additional winding body preferably comprises the additional second winding region completely. In particular, the additional second winding is provided to be supplied by the second supply voltage.

[0019] It would be conceivable for the further winding body to be arranged, at least in sections, only between the stator tooth and the further stator tooth and, in particular, to be intended only for winding by the second and the further second winding. However, the further winding body is preferably arranged, at least in sections, between at least three stator teeth. The further winding body is preferably arranged, at least in sections, between all adjacent stator teeth. The further winding body preferably has, at least as viewed in the axial direction of the stator, a circular further circumference. The further winding body is preferably intended to be inserted, with respect to the axial direction of the stator, at least in sections from the front and / or rear between the stator teeth, in particular simultaneously between all stator teeth.The additional winding body can be formed in two parts, at least for assembly of the stator, and in particular can be designed to be inserted between the stator teeth simultaneously from the front and rear during assembly. Preferably, the stator has only one additional winding body for winding the second stator winding. Preferably, the winding body and the additional winding body have an at least substantially identical shape to one another, with the additional winding body, in particular, having a smaller additional circumference than the circumference of the winding body.

[0020] Alternatively, it is conceivable that the winding body is provided to at least partially accommodate the second winding and / or the further second winding, in particular every second winding. It is conceivable that the winding body is provided for winding the first stator winding and the second stator winding. It is particularly conceivable that the winding body at least partially comprises the first and second winding regions. In particular, it is conceivable that the stator comprises only one winding body.

[0021] It is further proposed that the winding body at least partially provides the wall, whereby in particular a particularly efficient separation between the first winding region and the second winding region can be achieved. Advantageously, the winding body can separate each first winding region and each second winding region of the stator. In particular, the winding body can advantageously separate the first and second stator windings. Preferably, the winding body has at least one separating section which is arranged at least between the stator tooth and the further stator tooth and which in particular runs at least partially parallel to the circumferential direction of the stator. The separating section is preferably arranged between the first and the second winding region and in particular forms the wall at least partially.

[0022] In the embodiment in which the stator has only one winding body, the winding body preferably has at least one bulge that provides the wall and / or the separating section. In particular, it is conceivable for the wall to be formed entirely by the winding body.

[0023] Alternatively or additionally, it is proposed that the further winding body at least partially provides the wall. Advantageously, the wall can particularly reliably separate the first and the second winding region. Advantageously, the further winding body can separate each first winding region and each second winding region of the stator. In particular, the winding body can advantageously separate the first and second stator windings. Preferably, the further winding body has at least one further separating section, which is arranged at least between the stator tooth and the further stator tooth and which runs in particular parallel to the circumferential direction of the stator. The separating section and the further separating section preferably form the wall at least between the stator tooth and the further stator tooth. The further separating section of the further winding body is preferably designed as a closed separating surface.Advantageously, the wall between the first and second stator windings can be designed to be closed, particularly with respect to a viewing direction parallel to the axial direction of the stator. Preferably, at least the separating section and / or the further separating section are designed to be electrically insulating.

[0024] It is further proposed that the winding body be offset radially outward relative to the further winding body with respect to an axial direction of the stator. In particular, the first winding region is offset radially outward relative to the second winding region with respect to the axial direction. In particular, each first winding region is offset radially outward relative to a respective second winding region with respect to the axial direction. Preferably, an inner circumference of the winding body bears against an outer circumference of the further winding body with respect to the axial direction, at least in sections. Preferably, the separating unit bears against the further separating unit.

[0025] Preferably, the first winding, in particular each first winding, is offset radially outward relative to the second winding, in particular each second winding, with respect to the axial direction. As a result, a connecting path between the second windings and thus in particular current losses between the second windings can be advantageously reduced, in particular for a second supply voltage that is lower than the first supply voltage. Furthermore, advantageous stability for the assembly of the stator, in particular winding, can be provided for the second winding, which is thicker than the first winding. Alternatively, it is conceivable for the winding body to be offset radially inward relative to the further winding body with respect to an axial direction of the stator.

[0026] It is further proposed that the stator have at least one connection element for an electrical connection to the first winding or the second winding. The connection element is preferably provided for an electrical connection of the stator to the energy source. Preferably, the at least one connection element is part of the winding body and / or the further winding body, whereby the connection element can be integrated into the stator particularly efficiently. Preferably, the winding body and / or the further winding body has / have, in particular also during assembly, at least the one connection element and lead frame parts which are necessary for a respective wiring of the first and / or second stator winding.The stator preferably has at least one first connection element for electrical connection to the first winding and at least one second connection element for electrical connection to the second winding. The at least one connection element, in particular the first and / or the second connection element, are preferably arranged on an outer circumference of the winding body and / or on the outer circumference of the further winding body. Advantageously, a connection wire can run between the windings and / or the at least one connection element, at least in sections, on an outer side of the winding body and / or the further winding body, whereby in particular a structure of the stator can be provided in an advantageously orderly and / or compact manner. A first connection wire of the first stator winding can advantageously be spatially separated from a second connection wire of the second stator winding and in particular electrically insulated.

[0027] The stator preferably has a plurality of first connection elements, in particular identical to one another, for electrically connecting and, in particular, interconnecting a plurality of first windings. The first windings are preferably connected in a star connection, with the stator in particular having exactly four first connection elements. Alternatively, another connection structure that would be appropriate to a person skilled in the art, for example, a delta connection, would be conceivable for the first windings. The stator preferably has a plurality of second connection elements, in particular identical to one another, for electrically connecting and, in particular, interconnecting a plurality of second windings.The second windings are preferably connected in a delta connection, wherein the stator in particular has exactly three second connection elements. Alternatively, another connection structure that appears reasonable to a person skilled in the art, for example a star connection, would be conceivable for the second windings. It is conceivable that each first and / or second winding can be assigned to a different phase phase of a circuit. Alternatively, at least two first and / or second windings can each be connected in phase and in particular form a first and / or second winding phase. The windings of a winding phase can be arranged opposite one another in the stator and / or at a maximum distance from one another. Alternatively, another arrangement that appears reasonable to a person skilled in the art would be conceivable. The first windings of the first winding phase are preferably connected in series with one another.The second windings of the second winding phase are preferably connected in parallel to one another.

[0028] The winding body preferably has at least one first connection element, in particular each first connection element. It is conceivable for the winding body to have at least one second connection element, in particular each second connection element. In particular, the winding body can have all connection elements of the stator on the outer circumference of the winding body. Advantageously, the stator has at least one insulation element for electrically insulating a second and / or first connection wire from the corresponding first or second stator winding. The stator winding has, in particular, the respective connection wire.

[0029] Preferably, however, the stator has at least one connection element which is arranged in the region of the wall. As a result, the structure of the stator can be advantageously simplified and / or made particularly compact. Preferably, the stator has the second connection element, in particular all second connection elements, in the region of the wall and in particular on the wall. The second connection element, in particular every second connection element, is preferably arranged on the outer circumference of the further winding body. The second connection element, in particular every second connection element, is preferably arranged on the further separating section. In particular, the further winding body has the at least one second connection element, in particular every second connection element.Advantageously, the second stator winding can be separated from the first stator winding, in particular at least spatially and / or by at least part of the wall, thereby increasing the electrical safety distances of the stator and / or achieving a particularly compact stator design. In particular, the first and second connecting wires can be advantageously separated from each other and / or electrically insulated from each other, in particular already free of the insulation element.

[0030] Preferably, the first connection element is arranged on the outer circumference of the winding body at a maximum distance from the second connection element on the outer circumference of the further winding body. Alternatively, another arrangement of the connection elements that would be deemed appropriate by a person skilled in the art is conceivable.

[0031] Furthermore, it is proposed that the first winding and the second winding be connected to the same end of the stator with respect to an axial direction of the stator, in particular the axial direction mentioned above, which advantageously reduces the complexity of the connection. Preferably, the connection elements are arranged at the same end of the stator.

[0032] Alternatively, the first winding and the second winding can be connected to opposite ends of the stator with respect to the axial direction of the stator. In particular, the first connection element and the second connection element can be arranged at opposite ends of the stator. In this case, the first winding and the second winding can advantageously be connected spatially separated from one another, in particular for a connection only at the winding body.

[0033] It is further proposed that the winding body have at least one access opening, whereby a winding needle can advantageously reach at least the first winding region. This advantageously improves assembly of the stator. The winding body preferably has at least one access opening in a respective section between two stator teeth. The access opening is preferably provided for access to at least part of the first winding region. Preferably, two adjacent access openings are provided for access to the at least first winding region. The access opening is preferably arranged on and / or in the separating section of the winding body.

[0034] The access opening is preferably arranged on the inner circumference of the winding body. The access opening is preferably arranged in a region of the wall and advantageously on the wall. The winding body preferably has exactly one access opening in each section between the two stator teeth. The further winding body preferably has at least one further access opening. The further winding body preferably has exactly one further access opening in each section between the two stator teeth. The further access opening is preferably provided for access to at least part of the second winding region. Two adjacent further access openings are preferably provided for access to the second winding region. The further access opening is preferably formed on the inner circumference of the further winding body.Preferably, the further winding body, in particular at least the further separating section, closes the access opening at least in an assembled state of the stator, with the access being blocked in particular. This can provide particularly effective electrical insulation.

[0035] Alternatively, it is conceivable for the winding body to have the additional access opening. The additional access opening is preferably arranged on the inner circumference of the winding body. The access opening is preferably arranged on the bulge of the winding body. The access opening is preferably also open in the assembled state and, in particular, provides access. Furthermore, a method for assembling the electric motor device is proposed. This can advantageously improve the safety and / or compact design of the stator.

[0036] The method preferably comprises a method step, in particular an insertion step, in which the winding body is inserted into a laminated core of the stator. In the insertion step, the winding body is preferably arranged and in particular fixed, at least in section, between the stator teeth, in particular at least the stator tooth and the further stator tooth. It is conceivable that the winding body is sprayed directly onto and / or between the stator teeth, in particular at least the stator tooth, in the insertion step. The method preferably comprises a further method step, in particular a first winding step, in which the first winding and in particular the further first winding, preferably the first stator winding, is wound around the winding body, in particular by a needle winding machine.In the first winding step, the first stator winding is preferably welded and in particular connected to the at least one first connection element. The first stator winding is preferably formed from a one-piece wire, wherein the wire is wound in particular continuously in the first winding step. The first winding step takes place in particular after the insertion step. The method preferably comprises a further method step, in particular a further insertion step, in which the further winding body is inserted into the laminated core of the stator. In the further insertion step, the further winding body is preferably arranged and in particular fixed at least in section between the stator teeth, in particular at least the stator tooth and the further stator tooth.It is conceivable that the further winding body is sprayed directly onto and / or between the stator teeth, in particular at least the stator tooth, in the further introduction step. The further introduction step takes place in particular after the first winding step. Preferably, the method comprises a further method step, in particular a second winding step, in which the second winding and in particular the further second winding, preferably the second stator winding, is wound around the further winding body, in particular by a needle winding machine. The second stator winding is preferably formed from a one-piece wire, in particular different from the wire of the first stator winding, wherein the wire is wound in particular continuously in the second winding step.In the second winding step, the second stator winding is preferably welded and, in particular, connected to the at least one second connection element. The second winding step takes place, in particular, after the further insertion step. Alternatively, it is conceivable for the stator to have only one winding body, with the second winding step taking place, in particular, immediately after the first winding step, and the method being free of the further insertion step.

[0037] The electric motor device, the electric motor, the handheld power tool, and the method for assembling the electric motor device are not intended to be limited to the application and embodiment described above. In particular, the electric motor device, the electric motor, the handheld power tool, and the method for assembling the electric motor device may, in order to fulfill a functionality described herein, have a number of individual elements, components, and units as well as method steps that differs from the number stated herein. Furthermore, in the value ranges specified in this disclosure, values ​​within the stated limits are also to be considered disclosed and can be used arbitrarily.

[0038] drawing

[0039] Further advantages will become apparent from the following description of the drawings. The drawings illustrate three exemplary embodiments of the invention. The drawings, the description, and the claims contain numerous features in combination. Those skilled in the art will also expediently consider the features individually and combine them into useful further combinations.

[0040] They show:

[0041] Fig. 1 is a schematic representation of a hand-held power tool with an electric motor having an electric motor device, Fig. 2 is a sectional view of a part of the electric motor device, Fig. 3 is a front view of the electric motor device, Fig. 4 is a side view of the electric motor device, Fig. 5 is a flowchart of a method for assembling the electric motor device,

[0042] Fig. 6 is a front view of an alternative embodiment of an electric motor device,

[0043] Fig. 7 is a side view of the electric motor device of Figure 6,

[0044] Fig. 8 is a sectional view of the electric motor device of Figure 6 and

[0045] Fig. 9 is a side view of another alternative embodiment of an electric motor device.

[0046] Description of the embodiments

[0047] Figure 1 shows a handheld power tool 72a with an electric motor 70a. The electric motor 70a is designed as a brushless DC motor. The electric motor 70a has an electric motor device 10a with a stator 12a.

[0048] The electric motor 70a has a rotor 74a. The electric motor 70a is intended to drive at least one tool 84a, in this case a drilling tool. The handheld power tool 72a is embodied as a hybrid hammer drill. Alternatively, another embodiment of the handheld power tool 72a and / or the tool 84a that would be deemed appropriate by a person skilled in the art is conceivable.

[0049] The handheld power tool 72a has a power connector 76a for connection to a household outlet (not shown). The handheld power tool 72a has a battery pack interface 78a for connection to a battery pack 80a.

[0050] The handheld power tool 72a has an operating element 82a for controlling the operation of the electric motor 70a. The operating element 82a is provided for controlling the operation of a power supply to the electric motor device 10a.

[0051] The handheld power tool 72a has an electronics unit 90a. The electronics unit 90a has at least one processing unit 86a for processing the current from the power connector 76a and / or from the battery pack interface 78a into different supply voltages. The battery pack interface 78a provides a direct voltage. The power connector 76a provides an alternating voltage. The processing unit 86a provides a first supply voltage based on the alternating voltage. The processing unit 86a provides a second supply voltage based on the direct voltage.

[0052] The electronics unit 90a has a control unit 88a. The control unit 88a is provided at least for controlling the power supply of the electric motor device 10a, depending on a position of the control element 82a and depending on the power supply by the power connector 76a and / or the battery pack interface 78a.

[0053] Figure 2 shows a schematic sectional view of a portion of the electric motor device 10a and the stator 12a. The stator 12a has a first winding 14a and at least one second winding 16a for operation by the at least two different supply voltages and at least one stator tooth 18a, wherein a first winding region 20a for the first winding 14a and at least one second winding region 22a for the second winding 16a are arranged on the stator tooth 18a. The first winding 14a is provided for supply by the first supply voltage. The second winding 16a is provided for supply by the second supply voltage. The first winding region 20a and the second winding region 22a each enclose the stator tooth 18a.

[0054] The stator 12a has a wall 40a that separates the first winding region 20a and the second winding region 22a. The wall 40a is electrically insulating. The wall 40a is made of a plastic. Alternatively, another electrically insulating material that would be appropriate to one skilled in the art would be conceivable for the wall 40a. The wall 40a encloses at least the stator tooth 18a.

[0055] The stator 12a has at least one further stator tooth 28a and a winding body 30a for receiving the first winding 14a. The winding body 30a is arranged at least in sections between the stator tooth 18a and the further stator tooth 28a. The winding body 30a has the first winding region 20a. The further stator tooth 28a is adjacent to the stator tooth 18a.

[0056] The stator 12a has at least one further first winding 24a, which is at least partially wound on the winding body 30a. A further first winding region 50a for the further first winding 24a is arranged on the further stator tooth 28a. The winding body 30a has the further first winding region 50a.

[0057] The stator 12a has at least one further winding body 32a for at least partially accommodating the second winding 16a, which is arranged at least in sections between the stator tooth 18a and the further stator tooth 28a. The further winding body 32a has the second winding region 22a.

[0058] The stator 12a has a further second winding 26a, which is at least partially wound on the further winding body 32a. A further second winding region 52a for the further second winding 26a is arranged on the further stator tooth 28a. The further winding body 32a has the further second winding region 52a. The further first winding region 50a and the further second winding region 52a each enclose the further stator tooth 28a.

[0059] The winding body 30a at least partially provides the wall 40a. The winding body 30a has at least one separating section 46a. The separating section 46a is at least partially arranged between the stator tooth 18a and the further stator tooth 28a. The separating section 46a is arranged between the first winding region 20a and the second winding region 22a. The separating section 46a at least partially forms the wall 40a. The separating section 46a runs along an inner circumference 54a of the winding body 30a.

[0060] The further winding body 32a at least partially provides the wall 40a. The further winding body 32a has at least one further separating section 48a. The further separating section 48a is at least partially arranged between the stator tooth 18a and the further stator tooth 28a. The further separating section 48a is arranged between the first winding region 20a and the second winding region 22a. The further separating section 48a at least partially forms the wall 40a. The further separating section 48a runs along an outer circumference 60a of the further winding body 32a.

[0061] The separating section 46a and the further separating section 48a form the wall 40a. The winding body 30a and the further winding body 32a are at least substantially electrically insulating.

[0062] Figure 3 shows a front view of the electric motor device 10a and the stator 12a. The stator 12a has a plurality of identically formed first windings on a plurality of stator teeth of the stator 12a. The stator 12a has at least three, and in this case exactly six, first windings. The winding body 30a is arranged at least in sections between all adjacent stator teeth. The first windings are provided for supply by the first supply voltage.

[0063] The stator 12a has a plurality of identically configured second windings on the plurality of stator teeth of the stator 12a. The stator 12a has at least three, and in this case exactly six, second windings. The stator 12a has the same number of first and second windings. The further winding body 32a is arranged at least in sections between all adjacent stator teeth. The second windings are provided for supply by the second supply voltage.

[0064] The stator 12a has a plurality of identically formed first and second winding regions on the stator teeth, wherein only the first winding region 20a and the further first winding region 50a, as well as the second winding region 22a and the further second winding region 52a are designated.

[0065] The winding body 30a has a circular inner circumference 54a and a circular outer circumference 56a, at least as viewed in an axial direction 66a of the stator 12a. The further winding body 32a has a circular inner circumference 58a and the circular outer circumference 60a, at least as viewed in the axial direction 66a of the stator 12a. The wall 40a separates each first winding region and each second winding region of the stator 12a.

[0066] The winding body 30a is offset radially outwards relative to the further winding body 32a with respect to an axial direction 66a of the stator 12a.

[0067] The first winding region 20a is offset radially outward relative to the second winding region 22a with respect to the axial direction 66a of the stator 12a. The first winding 14a is offset radially outward relative to the second winding 16a with respect to the axial direction 66a of the stator 12a. The inner circumference 54a of the winding body 30a abuts, at least in sections, the outer circumference 60a of the further winding body 30a. The separating section 46a abuts the further separating section 48a (see Figure 2).

[0068] The winding body 30a has at least one access opening 42a. The access opening 42a is provided for access of a winding needle (not shown) to at least a portion of the first winding region 20a during assembly of the stator 12a. The access opening 42a is arranged between the stator tooth 18a and the further stator tooth 28a. The access opening 42a is arranged in a region of the wall 40a. The access opening 42a is arranged in the separating section 46a of the winding body 30a. The access opening 42a is arranged on the inner circumference 54a of the winding body 30a.

[0069] The additional winding body 32a has an additional access opening 44a. The additional access opening 44a is provided for access of the winding needle to at least a portion of the second winding region 22a during assembly of the stator 12a. The additional access opening 44a is arranged between the stator tooth 18a and the additional stator tooth 28a. The additional access opening 44a is arranged in a region of the wall 40a. The additional access opening 42a is arranged on the inner circumference 58a of the additional winding body 32a. The additional winding body 32a closes the access opening 42a, at least in the assembled state.

[0070] The winding body 30a and the further winding body 32a have a plurality of access openings and further access openings between the stator teeth, wherein only one access opening 42a and one further access opening 44a are designated.

[0071] Figure 4 shows a side view of the electric motor device 10a and the stator 12a.

[0072] The stator 12a has at least one first connection element 34a for electrically connecting the first winding 14a. The first connection element 34a is part of the winding body 30a. The first connection element 34a is arranged on the outer circumference 56a of the winding body 30a (see Figure 3). The stator 12a has a plurality of identically designed first connection elements for electrically connecting the first windings, with only the first connection element 34a being designated. The first windings are connected in a star circuit in the present case. The winding body 30a has exactly four first connection elements.

[0073] A first connecting wire 38a of the stator 12a connects at least the first winding 14a to at least one additional first winding 92a and at least to the first connecting element 34a. The first connecting wire 38a runs at least partially along the outer circumference 56a of the winding body 30a. The first winding 14a and the additional first winding 92a are connected in phase. Opposite windings with respect to the axial direction 66a are connected in phase in this case.

[0074] The stator 12a has at least one second connection element 36a for an electrical connection to the second winding 16a. The second connection element 36a is part of the further winding body 32a. The second connection element 36a is arranged on the outer circumference 60a of the further winding body 32a (see Figure 3). The stator 12a has a plurality of identically designed second connection elements for an electrical connection of the plurality of second windings, wherein only the one second connection element 36a is designated. In the present case, the second windings are connected in a delta circuit. The further winding body 32a has exactly three second connection elements. The second winding 16a and an additional second winding 94a are connected in phase.A second connecting wire (not shown) of the stator 12a for electrically connecting the second windings and / or second connecting elements is arranged in and / or on the further winding body 32a and runs at least in sections along the outer circumference 60a of the further winding body 32a.

[0075] At least the first connecting wire 38a and the first windings form a first stator winding 62a. At least the second connecting wire 38a and the second windings form a second stator winding 64a.

[0076] The second connection element 36a is arranged in the region of the wall 40a. The second connection element 36a is arranged on the wall 40a. Every second connection element 36a is arranged on the wall 40a. The second connection element 36a is arranged on the further separating section 48a. The wall 40a separates the first stator winding 62a from the second stator winding 64a.

[0077] The first winding 14a and the second winding 16a are connected to the same end of the stator 12a with respect to an axial direction 66a of the stator 12a. The first connection element 34a and the second connection element 36a are arranged at the same end of the stator 12a.

[0078] Figure 5 shows a flowchart of a method for assembling the electric motor device 10a. The method comprises an introduction step 100a in which the winding body 30a is arranged, at least in sections, at least between the stator tooth 18a and the further stator tooth 28a. In a first winding step 102a of the method, the first stator winding 62a is wound around the winding body 30a and welded to the first connection elements 34a. The method comprises a further introduction step 104a in which the further winding body 32a is arranged, at least in sections, at least between the stator tooth 18a and the further stator tooth 18a. In a second winding step 106a of the method, the second stator winding 64a is wound around the winding body 32a and welded to the second connection elements 36a.

[0079] Figures 6 to 9 show two further embodiments of the invention. The following descriptions and the drawings are essentially limited to the differences between the embodiments, whereby with regard to components with the same designation, in particular with regard to components with the same reference numerals, reference can in principle also be made to the drawings and / or the description of the other embodiments, in particular Figures 1 to 5. To distinguish the embodiments, the letter a is placed after the reference numerals of the embodiment in Figures 1 to 5. In the embodiments in Figures 6 to 9, the letter a is replaced by the letters b and c.

[0080] Figure 6 shows a front view of an electric motor device 10b with a stator 12b. The stator 12b has only a single winding body 30b. The winding body 30b has a first winding region 20b and a second winding region 22b. The winding body 30b is provided to accommodate a first winding 14b and a second winding 16b. The winding body 30b is provided to at least partially accommodate a first stator winding 62b and a second stator winding 64b.

[0081] The winding body 30b has at least one access opening 42b for access to the first winding region 20b. The winding body 30b has at least one further access opening 44b for access to at least the second winding region 22b. The access opening 42b and the further access opening 44b are accessible in the assembled state.

[0082] A first connecting wire 38b for electrically connecting a plurality of first windings to one another and to at least one first connecting element 34b (see Figure 7) runs at least partially along an outer circumference 56b of the winding body 30b. A second connecting wire 68b for electrically connecting a plurality of second windings to one another and to at least one second connecting element 36b runs at least partially along the outer circumference 56b of the winding body 30b.

[0083] The stator 12b has at least one insulation element 96b for electrically insulating the first stator winding 62b from the second stator winding 64b. The insulation element 96b surrounds at least a portion of the second connecting wire 68b. The insulation element 96b surrounds the second connecting wire 68b in a region between the first winding 14b and another first winding 24b. The insulation element 96b surrounds the second connecting wire 68b in a region of the first stator winding 62b.

[0084] Figure 7 shows a side view of the electric motor device 10b and the stator 12b. Figure 8 shows a section of the side view of the electric motor device 10b and the stator 12b. The first winding 14b and the second winding 16b are connected to opposite ends of the stator 12b with respect to an axial direction 66b of the stator 12b. At least the first connection element 34b and at least the second connection element 36b are arranged at opposite ends of the stator 12b.

[0085] Figure 9 shows a side view of an electric motor device 10c with a stator 12c. According to the embodiment of Figures 6 to 8, with the letter b in the reference numerals, the stator 12c has only a single winding body 30c. In contrast to the electric motor device 10b in the embodiment of Figures 6 to 8, the stator 12c in Figure 9 has a first winding 14c and a second winding 16c, which are connected to the same end of the stator 12c with respect to an axial direction 66c of the stator 12c.

[0086] The stator 12c has at least one first connection element 34c and at least one second connection element 36c, which are arranged at the same end of the stator 12c. The first connection element 34c and the second connection element 36c are arranged on an outer circumference 56c of the winding body 30c. All first and second connection elements are arranged on the outer circumference 56c of the winding body 30c, with only one first connection element 34c and one second connection element 36c being designated.

Claims

Claims 1 . Electric motor device (10a; 10b; 10c) with a stator (12a; 12b; 12c) which has a first winding (14a; 14b; 14c) and at least one second winding (16a; 16b; 16c) for operation by at least two different supply voltages and at least one stator tooth (18a; 18b; 18c), wherein a first winding region (20a; 20b; 20c) for the first winding (14a; 14b; 14c) and at least one second winding region (22a; 22b; 22c) for the second winding (16a; 16b; 16c) are arranged on the stator tooth (18a; 18b; 18c), characterized in that the stator (12a; 12b; 12c) has a wall (40a; 40b; 40c) which separates the first winding region (20a; 20b; 20c) and the second winding region (22a; 22b; 22c).

2. Electric motor device (10a; 10b; 10c) according to one of the preceding claims, characterized in that the stator (12a; 12b; 12c) has at least one further stator tooth (28a; 28b; 28c) and a winding body (30a; 30b; 30c) for at least partially receiving the first winding (14a; 14b; 14c), which is arranged at least in sections between the stator tooth (18a; 18b; 18c) and the further stator tooth (28a; 28b; 28c).

3. Electric motor device (10a; 10b; 10c) according to one of claims 1 or 2, characterized in that the stator (12a; 12b; 12c) has at least one further first winding (24a; 24b; 24c) which is at least partially wound on the winding body (30a; 30b; 30c).

4. Electric motor device (10a) according to claim 2 or 3, characterized in that the stator (12a) has at least one further winding body (32a) for at least partially receiving the second winding (16a), which is arranged at least in sections between the stator tooth (18a) and the further stator tooth (28a).

5. Electric motor device (10a) according to claim 4, characterized in that the stator (12a) has a further second winding (26a) which is at least partially wound on the further winding body (32a).

6. Electric motor device (10a; 10b; 10c) according to one of claims 2 to 5, characterized in that the winding body (30a; 30b; 30c) at least partially provides the wall (40a; 40b; 40c).

7. Electric motor device (10a) according to one of the preceding claims, but at least according to claim 4, characterized in that the further winding body (32a) at least partially provides the wall (40a).

8. Electric motor device (10a) according to one of the preceding claims, but at least according to claim 4, characterized in that the winding body (30a) is offset radially outwards relative to the further winding body (32a) with respect to an axial direction (66a) of the stator (12a).

9. Electric motor device (10a; 10b; 10c) according to one of the preceding claims, characterized in that the stator (12a; 12b; 12c) has at least one connection element (36a; 36b; 36c) for an electrical connection to the first winding (14a; 14b; 14c) or the second winding (16a; 16b; 16c) which is arranged in the region of the wall (40a; 40b; 40c).

10. Electric motor device (10a; 10c) according to one of the preceding claims, characterized in that the first winding (14a; 14c) and the second winding (16a; 16c) are connected to a same end of the stator (12a; 12c) with respect to an axial direction (66a; 66c) of the stator (12a; 12c).

11. Electric motor device (10a; 10b; 10c) according to claim 2, characterized in that the winding body (30a; 30b; 30c) has at least one access opening (42a; 42b; 42c).

12. Electric motor (70a; 70b; 70c), in particular a brushless DC motor, with an electric motor device (10a; 10b; 10c) according to one of the preceding claims.

13. Hand tool (72a; 72b; 72c) with an electric motor (70a; 70b; 70c) according to claim 12.

14. A method for assembling an electric motor device (10a; 10b; 10c) according to one of claims 1 to 11.

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