Electric motor and power tool including electric motor

Abstract

[Solution] An electric motor (120), particularly an axial flux motor, comprising a rotor (210) and first and second stators (220, 230), the rotor (210) being coupled to a motor shaft and arranged between the first stator (220) and the second stator (230) in the axial direction (202) of the motor shaft, wherein the first stator (220) is configured for operation at a first voltage level, particularly a network voltage, and the second stator (230) is configured for operation at a second voltage level, particularly a battery voltage.

Description

[Technical Field]

[0001] The present invention relates to an electric motor, in particular an axial flux motor, comprising a rotor and first and second stators, the rotor being coupled to a motor shaft and being arranged axially of the motor shaft between the first and second stators. [Background technology]

[0002] Electric motors are known in the prior art that are configured as axial flux motors and comprise a rotor and first and second stators, whereby the rotor is connected to the motor shaft and is arranged axially of the motor shaft between the first and second stators. Summary of the Invention

[0003] The present invention relates to an electric motor, in particular an axial flux motor, comprising a rotor and first and second stators, the rotor being coupled to a motor shaft and arranged axially of the motor shaft between the first and second stators, the first stator being configured for operation at a first voltage level, in particular a network voltage, and the second stator being configured for operation at a second voltage level, in particular a battery voltage.

[0004] The present invention thereby makes it possible to provide an electric motor in which the use of first and second stators may allow for a simplified construction for operation at different voltage levels.

[0005] Preferably, the first stator is connectable to a voltage network via a network line and the second stator is connectable to the battery pack.

[0006] This makes it possible in a simple manner to operate both via network lines and via a battery pack.

[0007] Preferably, the first stator is assigned a first electronic configuration group and the second stator is assigned a second electronic configuration group, each of the first and second electronic configuration groups being configured for motor control.

[0008] This allows for efficient and precisely tailored motor control for the drive mode selected by the user, i.e. battery operation or network operation, in each case.

[0009] The first stator is preferably arranged at a first axial distance from the rotor and the second stator is arranged at a second axial distance from the rotor, the first axial distance and the second axial distance being settable specifically for the operating mode.

[0010] This allows the first or second stator to be activated for operation at the respective assigned voltage level in a reliable and trustworthy manner.

[0011] When the first stator is energized in the network operation mode, the first axial spacing is preferably set to be smaller than the second axial spacing.

[0012] This allows efficient network operation, and the damping effect of a stator designed for battery operation can be at least largely eliminated by widening the air gap.

[0013] When the second stator is energized in the battery operation mode, the second axial spacing is preferably set to be smaller than the first axial spacing.

[0014] This allows for efficient battery operation, and the damping effect of a stator designed for network operation can be at least largely eliminated by widening the air gap.

[0015] According to one embodiment, in network operation mode, the first axial spacing is in the range of 0.05 mm to 1 mm and the second axial spacing is at least 0.06 mm, and in battery operation mode, the second axial spacing is in the range of 0.05 mm to 1 mm and the first axial spacing is at least 0.06 mm.

[0016] This allows suitable first and second axial distances to be preset precisely and quickly.

[0017] According to one embodiment, the first and second stators are coupled to each other to form a stator unit, and a moving device is provided for moving the stator unit axially within the motor housing.

[0018] This allows a simple switchover between network operation and battery operation, and the allocated gaps between the operating modes can be realized accordingly.

[0019] Preferably, the moving device is configured to move the first stator axially towards the rotor when current flow through the first stator is terminated to generate and / or strengthen a braking effect, and to move the second stator axially towards the rotor when current flow through the second stator is terminated to generate and / or strengthen a braking effect.

[0020] This may allow for a reliable and robust braking effect.

[0021] The invention further provides a power tool, in particular a hand tool machine, comprising an electric motor according to the invention.

[0022] The present invention thereby makes it possible to provide a power tool with an electric motor in which a simplified structure can be provided for operation at different voltage levels by means of the first and second stators.

[0023] Preferably, the first electronic group is assigned to network operation and the second electronic group is assigned to battery operation, and the first and / or second electronic group are integrated into the power tool.

[0024] This may allow for a secure and reliable positioning of the first and / or second electronic components within the power tool.

[0025] Preferably, the first electronic group is assigned to network operation and the second electronic group is assigned to battery operation, the first electronic group being integrated into the network line or formed as a unit that can be plugged into the battery pack interface of the power tool.

[0026] This may allow for alternative arrangements of the first electronic configuration group easily and simply.

[0027] According to one embodiment, the first electronic group is assigned a third electronic group, which is located in the power tool, integrated in the first electronic unit, or located in a pluggable unit.

[0028] This may provide a compact and lightweight power tool which may be made possible simply by separating the functions of the first electronic component group.

[0029] According to one embodiment, the network line is detachably arranged on the power tool.

[0030] This may allow for easy and simple placement of the network lines on the power tool.

[0031] The invention will be explained in more detail in the following description on the basis of an embodiment shown in the drawing. [Brief explanation of the drawings]

[0032] [Figure 1] 1 is a schematic view of a power tool configured as a hand tool machine and equipped with an electric motor according to the invention; [Figure 2] 2 is a cross-sectional view of the electric motor according to the present invention of FIG. 1; [Figure 3] 3 is a schematic view of the electric motor according to the invention of FIGS. 1 and 2 according to another embodiment; FIG. [Figure 4] 4 is a schematic diagram of the electric motor according to the invention of FIG. 3 in a first operating mode. [Figure 5] 5 is a schematic diagram of the electric motor according to the invention of FIGS. 3 and 4 in another operating mode. [Figure 6] 2 is a schematic diagram of the power tool of FIG. 1 configured as a hand tool machine and with an alternative arrangement of electronic components assigned to the electric motor; [Figure 7] 7 is a schematic diagram of the power tool of FIGS. 1 and 6 configured as a hand tool machine and with an alternative arrangement of electronic components. FIG. [Figure 8] 2 is a schematic diagram of the power tool of FIG. 1 configured as a hand tool machine and with an alternative arrangement of network lines assigned to the electric motor. DETAILED DESCRIPTION OF THE INVENTION

[0033] In the figures, elements having the same or comparable function are given the same reference numerals and are described in detail only once.

[0034] 1 shows a power tool 100, exemplarily configured as a hand tool machine, including a housing 105 having a hand grip 115 for illustrative purposes. Preferably, the power tool 100 configured as a hand tool machine is provided with a tool receiving portion 140 for receiving an insert tool, such as a driver bit, a drill, etc. However, it should be noted that the present invention is not limited to hand tool machines, such as driver bits, hammer drills, impact drivers, saws, and circular saws, and the power tool 100 may also be configured as a garden tool, an electric bicycle, etc.

[0035] According to one embodiment, the power tool 100 is mechanically and electrically connectable to a battery pack 190 for a network-independent current supply, and includes a network line 180 for a network-dependent current supply. The battery pack 190 is illustratively removably disposed at a battery pack interface 192 of the power tool 100. The power tool 100 can then be operated in a network-independent or network-dependent manner.

[0036] A drive unit 127 is preferably arranged in the housing 105, which has at least one electric motor 120. The electric motor 120 is preferably configured to drive the tool receiving part 140 and thus an insert tool arranged in the tool receiving part 140. The electric motor 120 can be switched on and off, for example, via a hand switch 117. An optional transmission mechanism 130 can be assigned to the drive unit 127.

[0037] Preferably, an electronic unit 170 for controlling the motor is provided. Preferably, the electronic unit 170 comprises a first electronic group 185 assigned to the network line 180 and a second electronic unit 195 assigned to the accumulator pack 190. Preferably, the first and / or second electronic group 185, 195 are integrated in the power tool 100. The electronic unit 170 with the first and second electronic groups 185, 195 is arranged in the housing 105 of the power tool 100 according to one embodiment.

[0038] For illustrative purposes, electronic unit 170 is located within handgrip 115. However, electronic unit 170 or first and second electronic components 185, 195 may be located anywhere else within power tool 100 and / or within battery pack 190 or network line 180. Alternatively, first electronic components 185 may be integrated into network line 180 or located within battery pack interface 192 of power tool 100. Furthermore, network line 180 may be detachably located on power tool 100.

[0039] Figure 2 shows the electric motor 120 of Figure 1 configured as an axial flux motor. The electric motor 120 comprises a rotor 210 and first and second stators 220, 230. Preferably, the rotor 210 is arranged between the first and second stators 220, 230 in the axial direction 202 of a motor shaft (310; Figure 3) assigned to the electric motor 120. For illustrative purposes, the first stator 220 is arranged above the rotor 210, and the second stator 230 is arranged below the rotor 210.

[0040] The first stator 220 is preferably assigned a winding design 222 designed for battery operation, and the second stator 230 is preferably assigned a winding design 232 designed for network operation. Furthermore, the rotor 210 is preferably assigned a return path element 212. Preferably, the rotor 210, and in particular the return path element 212, has a first magnet unit 214 arranged facing the first stator 220 and a second magnet unit 216 arranged facing the second stator 230.

[0041] According to one embodiment, the first stator 220 is configured for operation at a first voltage level, in particular at a network voltage, and the second stator 230 is configured for operation at a second voltage level, in particular at a battery voltage. To this end, the first stator 220 can be connected to a voltage network via the network line 180 shown in Figure 1, and the second stator 230 can be connected to a battery pack 190. Preferably, the first stator 220 is assigned a first electronic configuration group 185 for motor control in network operation, and the second stator 230 is assigned a second electronic configuration group 195 for motor control in battery operation.

[0042] 3 shows electric motor 120 of FIGS. 1 and 2 disposed within motor housing 350, with rotor 210 coupled to motor shaft 310. Motor shaft 310 is preferably supported within housing 105 of power tool 100 of FIG. 1 via bearing elements 312, 314. Rotor 210 is preferably disposed between first stator 220 and second stator 230 in axial direction 202 of motor shaft 310.

[0043] According to one embodiment, the first and second stators 220, 230 are preferably coupled to one another via coupling members 322, 324 to form a stator unit 320. The rotor 210 is then preferably arranged within the stator unit 320. A moving device 330 is preferably provided for axially moving the stator unit 320 within the motor housing 350 along the axial direction 202 of the motor shaft 310 or along the arrow 305.

[0044] Preferably, the moving device 330 is configured to move the first stator 220 axially toward the rotor 210 when the current supply to the first stator 220 is terminated to generate and / or strengthen a braking effect, and to move the second stator 230 axially toward the rotor 210 when the current supply to the second stator 230 is terminated to generate and / or strengthen a braking effect. Furthermore, at this time, additionally, another braking function that is applied simultaneously, for example, regenerative braking as a generator, may be possible.

[0045] 1-3 in a networked operating mode 400, in which the first stator 220 is preferably energized. The first stator 220 is preferably positioned at a first axial spacing 404 relative to the rotor 210, and the second stator 230 is preferably positioned at a second axial spacing 402 relative to the rotor 210. In this case, the first axial spacing 404 and the second axial spacing 402 are preferably configurable in an operating mode-specific manner.

[0046] For illustrative purposes, or in the illustrated network operation mode 400 when the first stator 220 is energized, the first axial spacing 404 is smaller than the second axial spacing 402. In this case, in the network operation mode 400, the first axial spacing 404 is preferably in the range of 0.05 mm to 1 mm, and the second axial spacing 402 preferably has a minimum of 0.06 mm.

[0047] 5 shows the electric motor 120 of FIGS. 1-4 in a battery operation mode 500 in which the second stator 230 is energized. In the battery operation mode 500, the second axial spacing 402 is preferably smaller than the first axial spacing 404. Preferably, in the battery operation mode 500, the second axial spacing 402 is in the range of 0.05 mm to 1 mm, and the first axial spacing 404 is preferably at least 0.06 mm.

[0048] Figure 6 shows the power tool 100 of Figure 1, illustratively configured as a hand tool machine, with first and second electronic groups 185, 195 for controlling the motor of Figure 1. According to the embodiment shown in Figure 6, the first electronic group 185 is located in the network line 180, and the second electronic group 195 is located in the power tool 100, illustratively in the hand grip 115.

[0049] Optionally, a third electronic group 189 is provided, configured to perform some of the functions of the first electronic group 185 for network operation. For illustrative purposes, the third electronic group 189 is located within the housing 105 of the power tool 100, and in particular within the hand grip 115.

[0050] Preferably, the network line 180 is detachably arranged on the power tool 100. For this purpose, the power tool 100, illustratively the housing 105, is provided with a contact point 810.

[0051] FIG. 7 shows the power tool 100 of FIGS. 1 and 6 , exemplarily configured as a hand tool machine, with an alternative arrangement of the first electronics group 185 for motor control. In this case, the first electronics group 185 is configured as a pluggable unit 710 that can be placed in the battery pack interface 192 of the power tool 100. The battery pack 190 of FIG. 1 is not placed in the battery pack interface 192 in this case. The second electronics group 195 is located in the power tool 100 as described above. The third electronics group 189 is preferably located in the unit 710. In this case, the first and third electronics groups 185, 189 form a group unit 715.

[0052] 8 shows the power tool 100 of FIG. 1, exemplarily configured as a hand tool machine, with an electronics unit 170, which has both electronic groups 185, 195 and is arranged in the power tool 100. According to one embodiment, the electronics unit 170 is assigned the group unit 715 of FIG. 7, which has the first and third electronic groups 185, 189. In this case, the group unit 715 is arranged in the power tool 100, in particular in the hand grip 115. [Explanation of symbols]

[0053] 100 Power Tools 105 Housing 115 Hand Grip 117 Hand Switch 120 Electric Motor 127 Drive Unit 130 Transmission Mechanism 140 Tool holder 170 Electronic Unit 180 Network Line 185 First electron group 189 Third Electron Group 190 Battery Pack 192 Battery Pack Interface 195 Second electron group 202 Axial 210 rotor 212 Return path element 214 First Magnet Unit 216 Second Magnet Unit 220 First Stator 222 Winding Design 230 Second Stator 232 Winding Design 305 Arrow 310 Motor shaft 312 Bearing Elements 314 Bearing Elements 320 Stator Unit 322 Connecting members 324 Connecting members 330 Mobile Device 350 motor housing 400 Network Operation Mode 402 Second Axial Spacing 404 First Axial Spacing 500 Battery operation mode 710 units 715 Composition Group Unit 810 Contact points

Claims

1. An electric motor (120), in particular an axial flux motor, comprising: A rotor (210); First and second stators (220, 230); Equipped with The rotor (210) is coupled to a motor shaft (310) and is disposed between the first stator (220) and the second stator (230) in the axial direction (202) of the motor shaft (310). In the electric motor (120), the first stator (220) is configured for operation at a first voltage level, in particular a network voltage, and the second stator (230) is configured for operation at a second voltage level, in particular a battery voltage.

1. An electric motor, in particular an axial flux motor, characterized in that:

2. 2. The electric motor according to claim 1, characterized in that the first stator (220) is connectable to a voltage network via a network line (180) and the second stator (230) is connectable to a battery pack (190).

3. The first stator (220) is assigned a first electronic component group (185), and the second stator (230) is assigned a second electronic component group (195); the first and second electronic component groups (185, 195) are each configured for motor control; 3. An electric motor according to claim 1 or 2, characterized in that it comprises:

4. the first stator (220) is disposed at a first axial distance (404) from the rotor (210), and the second stator (230) is disposed at a second axial distance (402) from the rotor (210); the first axial spacing (404) and the second axial spacing (402) are configurable specific to an operating mode; 4. Electric motor according to any one of claims 1 to 3, characterized in that it comprises:

5. 5. The electric motor of claim 4, wherein when the first stator is energized in a network operating mode, the first axial spacing is set to be smaller than the second axial spacing.

6. 6. The electric motor according to claim 4, wherein when the second stator is energized in a battery operation mode, the second axial spacing is set to be smaller than the first axial spacing.

7. In the network operation mode (400), the first axial spacing (404) is in the range of 0.05 mm to 1 mm, and the second axial spacing (402) has a minimum of 0.06 mm; In the battery operating mode (500), the second axial spacing (402) is in the range of 0.05 mm to 1 mm, and the first axial spacing (404) has a minimum of 0.06 mm.

7. Electric motor according to claim 5 or 6, characterized in that

8. the first and second stators (220, 230) are coupled to each other to form a single stator unit (320); a moving device (330) for axially moving the stator unit (320) within the motor housing (350); 8. Electric motor according to any one of claims 1 to 7, characterized in that it comprises:

9. The moving device (330) When the energization of the first stator (220) is terminated, the first stator (220) is moved axially toward the rotor (210) to generate and / or enhance a braking effect; When the energization of the second stator (230) is terminated, the second stator (230) is moved axially toward the rotor (210) to generate and / or enhance a braking effect. It is formed as follows:

9. Electric motor according to claim 8, characterized in that

10. A power tool (100), in particular a hand tool machine, comprising an electric motor (120) according to any one of claims 1 to 9.

11. a first and second electronic configuration group (185, 195); the first electronic configuration group (185) is assigned to network operation and the second electronic configuration group (195) is assigned to battery operation; the first and / or second electronic components (185, 195) are integrated into the power tool (100); 11. The power tool according to claim 10,

12. a first and second electronic configuration group (185, 195); the first electronic configuration group (185) is assigned to network operation and the second electronic configuration group (195) is assigned to battery operation; the first electronic component group (185) is integrated into the network line (180) or is formed as a unit (710) that can be plugged into a battery pack interface (192) of the power tool (100); 11. The power tool according to claim 10,

13. a first and second electronic configuration group (185, 195); a third electronic configuration group (189) is assigned to the first electronic configuration group (185); the third electronic group (189) is located within the power tool (100), integrated within the first electronic unit (185), or located within the pluggable unit (710); 13. A power tool according to claim 11 or 12, characterized in that it comprises:

14. The power tool according to any one of claims 10 to 13, characterized in that the network line (180) is detachably arranged on the power tool (100).

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