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US 5,614,799 AGranted
Brushless direct current motor having adjustable motor characteristics
AssigneeMTS Systems Corporation
InventorsWilliam G. Anderson, William C. McAdams
Life of this patent
Estimating the term…
Abstract
A brushless direct current motor includes a permanent magnet mounted to a rotor and a set of commutated stator windings. The motor further includes a circuit for changeably connecting the set of stator windings to operate in a first electrical configuration or a second electrical configuration and a circuit for commutating the set of stator windings when connected in the first electrical configuration or the second electrical configuration.
Claims21
A brushless direct current motor comprising:
- a permanent magnet rotor;
- a set of stator windings;
- means for changeably connecting the set of stator windings to operate in a first electrical configuration or a second electrical configuration;
- phase shift means for providing a phase shift of commutation signals for the set of stator windings as a function of operation in the first electrical configuration or the second electrical configuration;
- commutation means operably connected to the phase shift means for commutating the set of stator windings when connected in the first electrical configuration or the second electrical configuration.
2 more elements
A brushless direct current motor comprising:
- permanent magnet rotor;
- a set of stator windings comprising a first plurality of stator windings and a second plurality of stator winding;
- means for changeably connecting the set of stator windings to operate in a wye electrical configuration or a delta electrical configuration;
- means for sensing an angular position of the rotor and providing a representative signal of angular position;
- phase shift means operably connected to the means for sensing to receive the representative signal, the phase shift means providing a 30 degree phase shift of commutation signals for the set of stator windings as a function of operation in the wye electrical configuration or the delta electrical configuration;
- commutation means operably connected to the phase shift means for commutating the set of stator windings when connected in the wye electrical configuration or the delta electrical configuration.
3 more elements
A brushless direct current motor comprising:
- a permanent magnet rotor
- a first set of stator windings;
- a second set of stator windings;
- means for selectively connecting the first and second set of stator windings to operate in a wye electrical configuration wherein each of the windings of the first set of stator windings are connected in series with a corresponding winding of the second set of stator windings or a delta electrical configuration wherein each of the windings of the first set of stator windings are connected in parallel with a corresponding winding of the second set of stator windings;
- a sensor operably coupled to the rotor to sense an angular position of the rotor, the sensor providing a sensor signal representing the angular position;
- a look-up table for providing a phase shift of commutation signals for the set of stator windings as a function of operation in the first electrical configuration or the second electrical configuration;
- a plurality of solid state switches connected to the set of stator windings;
- a controller operably connected to the look-up table, the plurality of switches and the sensor to receive the sensor signal, the controller receiving an input indicating that the set of stator windings are connected to operate in the wye electrical configuration or the delta electrical configuration, the controller using the look-up table for generating control signals to commutate the set of stator windings when connected in the wye electrical configuration or the delta electrical configuration as a function of the input.
5 more elements
Dependencies are inferred from the claim text.