Electric machine having segmented stator
First Claim
1. An electric machine comprising:
- a cylindrical stator comprising a plurality of stator sections, each stator section having an associated winding that is magnetically independent of the windings of the other stators, the winding being wound around an inner periphery of each of the plurality of the cylindrical stator sections;
a rotor disposed within the cylindrical stator; and
the plurality of stator sections being longitudinally offset from each other along a common central axis of the electric machine.
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Accused Products
Abstract
An electric machine, such as a brushless direct current motor, includes a number of stator formed as stator sections. The stator sections are longitudinally offset from each other along a common central axis of the electric machine. The stator sections are magnetically independent of one another, but are electrically driven with offset phases typically in a manner similar to a standard multi-phase motor. The stator sections may be further offset with one another in radial position. The structure of the stator sections provides advantages in terms of efficiency, power consumption, torque, and thermal performance, and can be especially advantageous where a battery is used to power the motor, such as in portable hand tools or driving motors for vehicles.
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Citations
37 Claims
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1. An electric machine comprising:
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a cylindrical stator comprising a plurality of stator sections, each stator section having an associated winding that is magnetically independent of the windings of the other stators, the winding being wound around an inner periphery of each of the plurality of the cylindrical stator sections;
a rotor disposed within the cylindrical stator; and
the plurality of stator sections being longitudinally offset from each other along a common central axis of the electric machine. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 37)
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10. A stator comprising:
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a first stator portion;
a second stator portion;
a third stator portion; and
each of the first through third stator portions including an associated winding being magnetically independent relative to the remainder of the first through third stator portions, the winding being wound around a plurality of tines, the plurality of tines being located in an inner surface of each of the first through third stator portions. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A stator comprising:
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a plurality of stator portions;
a winding associated with each of the plurality of stator portions, the winding being magnetically independent relative to the winding of the remaining plurality of stator portions; and
the winding being wound around a plurality of tines being located around an inner surface of each of the plurality of stator portions. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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Specification