Patent ID: 9231462
Filing Date: 2016-01-05
CPC Classification: B60L,H02K,H02P,Y02T

Claim Text:
1. An electric motor comprising: a first linear actuator including a first coil; a second linear actuator including a second coil; a rotational shaft; a cam assembly mounted on said rotational shaft for translating linear movement of the first and second linear actuators to rotational movement of the rotational shaft; and a controller programmed to generate during operation a first drive signal for the first coil and a second drive signal for the second coil, wherein the first drive signal causes the first linear actuator through interacting with the cam assembly to generate a first torque on the rotational shaft that varies periodically over a complete rotation of the shaft and the second drive signal causes the second linear actuator through interacting with the cam assembly to generate a second torque on the rotational shaft that varies periodically over the complete rotation of the shaft, wherein the controller is programmed to generate the first and second drive signals to produce a total torque that is substantially ripple free constant throughout the complete rotation of the shaft, the total torque comprising a sum of the first torque and the second torque.