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US 2019/0296603 A1Published application
End shield for a brushless electric motor
AssigneeHilti Aktiengesellschaft
InventorsThomas MAHLER, Manfred JAKOB, Torsten TUSSING
Life of this patent
Estimating the term…
Abstract
A non-output-side end shield (100) for a brushless electric motor (500) is provided, including a centrally arranged bearing seat (110) for accommodating a non-output-side rotor bearing (510) for a rotor shaft (560) of the brushless electric motor (500), the non-output-side end shield (100) including a sensor receptacle (150), which is used as a carrier for a sensor circuit board (550) for detecting the rotational position of the rotor shaft (560), the non-output-side end shield (100) and the sensor receptacle (150) being formed together as a one-part component.
Claims15
1-10:
- (canceled)
11:
- A non-output-side end shield for a brushless electric motor, the non-output side shield comprising:
- a centrally arranged bearing seat for accommodating a non-output-side rotor bearing for a rotor shaft of the brushless electric motor;
- a sensor receptacle used as a carrier for a sensor circuit board for detecting a rotational position of the rotor shaft, the non-output-side end shield and the sensor receptacle being formed as a one-part component.
12:
- The non-output-side end shield as recited in claim 11 further comprising three slide-in elements, spaced an equal distance apart, and designed to be accommodated, at least in sections, in a slide-in opening corresponding to a particular slide-in element and belonging to a stator laminated core of the electric motor.
13:
- The non-output-side end shield as recited in claim 12 wherein each of the slide-in elements has a radially oriented centering surface provided for the concentric centering of the slide-in element with respect to the stator laminated core and, in the installed state, abuts a radial supporting surface of the stator laminated core.
14:
- The non-output side end shield as recited in claim 13 wherein the centering surfaces are planar.
15:
- The non-output-side end shield as recited in claim 12 wherein each of the slide-in elements has two tangentially oriented centering surfaces provided for the angular alignment of the slide-in element with respect to the stator laminated core and, in the installed state, abut a particular tangential supporting surface of the stator laminated core.
16:
- The non-output side end shield as recited in claim 15 wherein the centering surfaces are planar.
17:
- The non-output-side end shield as recited in claim 12 wherein each of the slide-in elements has an axially oriented contact surface provided for maintaining a defined axial position between the non-output-side end shield and the stator laminated core and, in the installed state, abuts a preferably planar axial supporting surface of the stator laminated core.
18:
- The non-output side end shield as recited in claim 17 wherein the centering surfaces are planar.
19:
- The non-output-side end shield as recited in claim 11 further comprising three holding elements, spaced an equal distance apart, each of which has an elevation for a clamping screw provided for connecting the non-output-side end shield to an output-side end shield.
20:
- The non-output-side end shield as recited in claim 11 wherein the non-output-side rotor bearing is designed as a fixed roller bearing.
21:
- A brushless electric motor comprising:
- a stator laminated core;
- an output-side end shield;
- a non-output-side end shield as recited in claim 11;
- and
- a rotor shaft supported in an output-side rotor bearing of the output-side end shield, the output-side rotor bearing being designed as a movable roller bearing.
3 more elements
22:
- The brushless electric motor as recited in claim 21 further comprising a sensor circuit board accommodated in the sensor receptacle and for detecting the rotational position of the rotor shaft, the sensor circuit board being situated between the non-output-side end shield and the output-side end shield.
23:
- The brushless electric motor as recited in claim 22 wherein the sensor circuit board is situated between an underside of the end shield and the stator laminated core.
24:
- The brushless electric motor as recited in claim 21 further comprising a fan situated on the output side.