Back to results
US 10,454,403 B2Granted
Axial brushless DC motor with fractional and hold step function
AssigneeCTS Corporation
InventorsYulanda King, Scott Calkins
Life of this patent
Estimating the term…
Abstract
An axial brushless DC motor comprising a stator including a plurality of coils, a rotor including a magnet with a plurality of pairs of magnetic poles and adapted for movement relative to the stator in one or more full steps, and a coil phase circuit adapted for moving the rotor relative to the stator a fractional step less than the one or more full steps and/or holding the rotor at the fractional or one or more full steps.
Claims12
An axial brushless DC motor comprising:
- a stator including a plurality of coils, a base of the stator defining a central through-hole;
- a rotor including a magnet with a plurality of pairs of magnetic poles and adapted for movement relative to the stator in one or more full steps;
- an elongate sleeve bushing extending through the stator, the sleeve bushing further defining an interior through-hole therein;
- an elongate motor shaft extending through the interior through-hole of the sleeve bushing and including an upper end and a lower end, the lower end extending through the interior through-hole of the stator;
- a bearing mounting the motor shaft to the sleeve bushing for rotation relative to the sleeve bushing and the base of the stator, the bearing positioned against an end of the sleeve bushing, the end of the sleeve bushing extending into the central through-hole defined in the base of the stator;
- and
- a generally Y shaped coil phase circuit including first, second, and third coil phase circuit segments with respective first ends coupled to each other at a common connection point;
- the coil phase circuit adapted for moving the rotor on the upper end of the motor shaft relative to the stator a fractional step less than the one or more full steps and holding the rotor at the one or more fractional or full steps,
- wherein each of the first, second, and third coil phase circuit segments are energizable for holding the rotor at the one or more fractional steps between the one or more full steps relative to the stator.
6 more elements
An axial brushless DC motor comprising:
- a stator including a plurality of coils, a base of the stator defining a central through-hole;
- a rotor including a magnet with a plurality of pairs of magnetic poles and adapted for movement relative to the stator in full step positions;
- an elongate sleeve bushing extending through the stator, the sleeve bushing further defining an interior through-hole therein;
- an elongate motor shaft extending through the interior through-hole of the sleeve bushing and including an upper end and a lower end, the lower end extending through the interior through-hole of the stator;
- a bearing mounting the motor shaft to the sleeve bushing for rotation relative to the sleeve bushing and the base of the stator, the bearing positioned against an end of the sleeve bushing, the end of the sleeve bushing extending into the central through-hole defined in the base of the stator;
- and
- a coil phase circuit including first, second, and third coil phase segments including respective first segment ends connected directly to each other for connecting the first, second, and third coil phase segments in series at a common central connection point, each of the coil phase segments including a pair of coils configured in parallel and each of the coils in the pair of coils including respective first coil ends connected to the respective first segment ends of the first, second, and third coil phase segments which are connected to the common central connection point, and current being adapted for flow through the coil phase circuit in a manner adapted to switch the orientation of one or more of the plurality of pairs of magnetic poles of the magnet for moving the rotor on the upper end of the rotor shaft relative to the stator a fractional step position less than the full step position and holding the rotor at the fractional step position or full step position,
- wherein each of the first, second, and third coil phase segments are energizable for holding the rotor at the fractional step position or the full step position relative to the stator.
5 more elements
An axial brushless DC motor comprising:
- a stator including a plurality of coils, a base of the stator defining a central through-hole;
- a rotor including a magnet and adapted for movement in full or fractional step position relative to the stator;
- an elongate sleeve bushing extending through the stator, the sleeve bushing further defining an interior through-hole therein;
- an elongate motor shaft extending through the interior through-hole of the sleeve bushing and including an upper end and a lower end, the lower end extending through the interior through-hole of the stator;
- a bearing mounting the motor shaft to the sleeve bushing for rotation relative to the sleeve bushing and the base of the stator, the bearing positioned against an end of the sleeve bushing, the end extending into the central through-hole defined in the base of the stator;
- a generally Y shaped coil phase circuit including first, second, and third coil phase segments coupled together in series at a common central connection point, each of the first, second, and third coil phase segments including a pair of coils coupled in parallel, and energizable for moving the rotor on the upper end of the motor shaft between a first driving position and full or fractional step hold positions relative to the stator and for holding the rotor at the full or fractional step hold positions relative to the stator.
3 more elements
Dependencies are inferred from the claim text.