Apple Inc. (Cupertino, CA)

A motor with an electric charge is a device that converts at a minimum of the electric fields generated through windings of phase into an electric current.

Multiphase pulse width modulation voltages (PWM) are utilized to drive motors in electric vehicles. An electric motor driven by a PWM voltage produces a lot of electrical noise, particularly when compared to an electric motor that is driven with an uninterrupted sinusoidal voltage. It is possible for voltages to build up due to the parasitic capacitances , as well as electrical noise. When the voltage builds on the rotor, it can escape from the frame of the motor to the bearings. This may damage the bearings, and/or the races that keep and hold the bearings in relation to the rotor and frame of the electric motor. A discharge of voltage on bearings could cause damage to the bearings, which may reduce their longevity and result in failure of the electric motor.

One aspect of the disclosed embodiments is an electric motor that includes an rotor, a stator having an inner perimeter, and a slot in the stator, the slot having an overall width of the slot and the slot being oriented along an axis, phases windings linked to the stator and disposed at least partially within the slot and an opening which extends from the slot to the outer exterior of the stator’s periphery. The opening is defined by opposed surfaces that are spaced apart by an opening width and the width of the opening is between five to twenty-five percent of slot width.

An electric motor is another element of the described embodiments. It comprises the stator and rotor. A slot in the stator is equipped with the phase windings that are connected to it. An electric motor also includes a shield that directs most a portion the electric field produced by the windings of the phase to the stator. The shield has a plurality of shield components that are connected in an axially stacked configuration.

An electric motor is a different element of the disclosed embodiments. It includes the rotor, which has an inner outer periphery, and phase windings attached at least partially to the stator. Additionally, there is an in-slot inside the stator. The length of the slot is the length of the insulating element. The shield layer is disposed over the insulating element to direct at least a portion of the electric field generated by the phase windings into the stator, and the shield is located in contact with the stator.

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