Dual motor drive assembly
AssigneeZF Automotive UK Limited
InventorsRussell Wilson-Jones, Christos Prevezianos, Ari Akbar Hassan Al-Jaf
Life of this patent
Estimating the term…
Abstract
A dual motor drive assembly comprises a housing, a shaft rotatably mounted with respect to the housing, a first gear connected to and configured to rotate with the shaft, and first and second motors, each having an output driving a respective output gear, the output gears being engaged with the first gear, in which each motor comprises a permanent magnet motor that has the same number of poles and stators such that each motor produces the same pattern of cogging torque over a complete mechanical revolution of the motor.
Claims15
A dual motor drive assembly comprises a housing, a shaft rotatably mounted with respect to the housing, a first gear connected to and configured to rotate with the shaft, and first and second motors, each having an output driving a respective output gear, the output gears being engaged with the first gear, in which each motor comprises a permanent magnet motor that has the same number of poles and stators such that each motor produces the same pattern of cogging torque over a complete mechanical revolution of the motor, and such that the relative phasing of the first motor relative to that of the second motor is fixed whereby the effect of cogging torque applied to the shaft by the first motor is at least partially cancelled by the effect of cogging torque applied to the shaft by the second motor when the shaft is rotated, the relative phase offset between the motors is set as a function of the following motor parameters:
- number of rotor poles;
- number of cycles of a certain waveform per one mechanical rotation;
- the motor skew angle;
- and
- where the motor is step skewed, the skew angle per step of the magnets.
A dual motor drive assembly comprises a housing, a shaft rotatably mounted with respect to the housing, a first gear connected to and configured to rotate with the shaft, and first and second motors, each having an output driving a respective output gear, the output gears being engaged with the first gear, in which each motor comprises a permanent magnet motor that has the same number of poles and stators such that each motor produces the same pattern of cogging torque over a complete mechanical revolution of the motor, and such that the relative phasing of the first motor relative to that of the second motor is fixed whereby the effect of cogging torque applied to the shaft by the first motor is at least partially cancelled by the effect of cogging torque applied to the shaft by the second motor when the shaft is rotated in which both motors comprise permanent magnet motors in which the rotor has six permanent magnets and the stator has nine coil windings and the relative phasing between the two motors is 10 degrees mechanical plus M*20 degrees mechanical where M is zero or a positive integer value.
A dual motor drive assembly comprises a housing, a shaft rotatably mounted with respect to the housing, a first gear connected to and configured to rotate with the shaft, and first and second motors, each having an output driving a respective output gear, the output gears being engaged with the first gear, in which each motor comprises a permanent magnet motor that has the same number of poles and stators such that each motor produces the same pattern of cogging torque over a complete mechanical revolution of the motor, and such that the relative phasing of the first motor relative to that of the second motor is fixed whereby the effect of cogging torque applied to the shaft by the first motor is at least partially cancelled by the effect of cogging torque applied to the shaft by the second motor when the shaft is rotated in which both motors comprise permanent magnet motors in which the rotor has eight permanent magnets and the stator has 12 coil windings and the relative phasing between the two motors is 7.5 degrees mechanical plus M*15 degrees mechanical where M is zero or a positive integer value.
Dependencies are inferred from the claim text.