Electric motor arrangement for use in a medical, in particular in a dental handpiece and dental handpiece part
The invention relates to an electric-motor arrangement for a medical, in particular dental, hand piece which has a motor housing ( 2 ) and a rotor ( 4 ) which is arranged in the motor housing ( 2 ) so that it can be rotated about an axis (L) via a first bearing ( 6 ) and a second bearing ( 8 ). A stator ( 14 ) is arranged around the rotor ( 4 ) in relation to the axis (L). The first bearing ( 6 ) is received in a first bearing flange ( 10 ), and the second bearing ( 8 ) is received in a second bearing flange ( 12 ). Both bearing flanges ( 10, 12 ) are composed of metal and adjoin the motor housing ( 2 ) directly by way of their circumferential faces ( 101, 121 ). As a result, running noise and vibrations can be reduced. Moreover, premature wear and/or failure can be prevented.
1. Electric-motor arrangement for a medical handpiece, comprising:
a motor housing attachable to and detachable from a handpiece body,
a rotor arranged in the motor housing so that it can be rotated about an axis via a first bearing and a second bearing,
a stator arranged around the rotor in relation to the axis,
a first bearing flange in which the first bearing is received, and
a second bearing flange, in which the second bearing is received,
wherein the first bearing flange comprises metal and has a first circumferential face directly adjoining the motor housing, and the second bearing flange comprises metal and has a second circumferential face directly adjoining the motor housing, and
the stator is clamped between the first and second bearing flanges.
2. Electric-motor arrangement according to claim 1 , wherein the stator is centered radially in the motor housing in relation to the axis by the first and second bearing flanges.
3. Electric-motor arrangement according to claim 1 , further comprising a coupling element for connecting the electric-motor arrangement to the medical handpiece.
4. Electric-motor arrangement according to claim 3 , wherein the coupling element is a coupling pin.
5. Electric-motor arrangement according to claim 3 , wherein the coupling element is configured in one piece with the motor housing.
6. Electric-motor arrangement according to claim 1 , wherein the medical handpiece is a dental handpiece.
7. Electric-motor arrangement according to claim 1 , the first bearing flange including a first flat side and a second flat side that is parallel to the first flat side, the first flat side and the second flat side being perpendicular to the axis.
8. Electric-motor arrangement according to claim 7 , the first flat side and the second flat side extending radially outwardly to the first circumferential face.
9. Electric-motor arrangement according to claim 8 , the first bearing flange including a projection, which extends from the second flat side, opposite a coupling element.
10. Electric-motor arrangement according to claim 9 , the projection extending in a radial direction a lesser distance than the first circumferential face.
11. Electric-motor arrangement according to claim 10 , wherein the first bearing is gripped in the region of the projection.
12. Electric-motor arrangement according to claim 3 , the rotor including a rotor axle and the coupling element surrounds the rotor axle and the coupling element extends longitudinally beyond a first end of the rotor axle, the coupling element extending parallel to the axis.