Elevator system including a permanent magnet (PM) synchronous motor drive system
AssigneeOtis Elevator Company
InventorEdward D. Piedra
Life of this patent
Estimating the term…
Abstract
An elevator drive system (40) includes a permanent magnet (PM) synchronous electric motor (34) including a plurality of phases and a plurality of motor drives (55, 58) electrically connected to the PM synchronous electric motor. Each of the plurality of motor drives is operatively connected to a corresponding one of the plurality of phases. The plurality of motor drives is configured and disposed to deliver a torque current divided equally between each of the plurality of phases and independently deliver flux current to the corresponding one of the plurality of phases.
Claims22
An elevator drive system comprising:
- a permanent magnet (PM) synchronous electric motor including a plurality of phases;
- and
- a plurality of motor drives electrically connected to the PM synchronous electric motor, each of the plurality of motor drives being operatively connected to a corresponding one of the plurality of phases, the plurality of motor drives being configured and disposed to deliver a torque current divided equally between each of the plurality of phases and independently deliver flux current to the corresponding one of the plurality of phases;
- wherein one of the plurality of motor drives is designated as a primary motor drive and remaining ones of the plurality of motor drives are designated as secondary motor drives.
An elevator drive system comprising:
- a permanent magnet (PM) synchronous electric motor including a plurality of phases;
- and
- a plurality of motor drives electrically connected to the PM synchronous electric motor, each of the plurality of motor drives being operatively connected to a corresponding one of the plurality of phases, the plurality of motor drives being configured and disposed to deliver a torque current divided equally between each of the plurality of phases and independently deliver flux current to the corresponding one of the plurality of phases;
- wherein the PM synchronous electric motor includes at least twelve (12) phases.
An elevator system comprising:
- a hoistway;
- a car movably arranged with the hoistway;
- and
- an elevator drive system operatively connected to the car, the drive system comprising:
- a permanent magnet (PM) synchronous electric motor operatively connected to the car, the PM synchronous electric motor including a plurality of phases;
- and
- a plurality of motor drives electrically connected to the PM synchronous electric motor, each of the plurality of motor drives being operatively connected to a corresponding one of the plurality of phases, the plurality of motor drives being configured and disposed to equally deliver torque current to each of the plurality of phases and independently deliver flux current to the corresponding one of the plurality of phases;
- wherein one of the plurality of motor drives is designated as a primary motor drive and remaining ones of the plurality of motor drives are designated as secondary motor drives.
Dependencies are inferred from the claim text.