Patent ID: 8393443
Filing Date: 2013-03-12
Classification: B60L,H02K,Y02T

Abstract:
1. An electric drive system for a vehicle; said vehicle having at least one wheel incorporating a brake disc; said drive system including an electric motor at said at least one wheel of said vehicle; said electric motor adapted to provide rotational torque to the brake disc of said at least one wheel of said vehicle by way of induced eddy current from an electromagnetic field traveling in the same direction and opposite direction to the direction of disc rotation; wherein said motor comprises pairs of electromagnetic coils, wherein corresponding ones of each of said pairs of coils are disposed on opposite sides of a brake disc of said wheel; wherein said electromagnetic coils are provided with variable frequency 3-phase alternating current; said alternating current provided via an inverter from a battery power source; wherein braking of said vehicle is induced when said variable frequency is less than a frequency commensurate with a said rotational velocity; wherein there are at least two wheels with said disc brake and motor and wherein rotational velocity and direction of each wheel of said vehicle to which said electric motor is fitted is controlled independently of other wheels to which said electric motor is fitted and is a function of said variable frequency and modulation and phases of said 3-phase alternating current; wherein a first variable braking force is applied to each of said brake discs while said rotational direction is commensurate with said phases but said variable frequency is between that commensurate with said rotational velocity of said wheel and 0 Hz and a second variable braking force is applied to said brake disc when said rotational direction is opposite to that indicated by said arranging of two phases and said variable frequency is greater than 0 Hz; wherein Direct Current (DC) can be applied to the stator coils with the microprocessor controlled modulation to bring the vehicle to a complete stop, said microprocessor receiving multi-axis accelerometer input; wherein each motor has microprocessor input which is adapted to apply varying drive and/or brake rotational torque to each wheel independently as a function of inputs from sensors monitoring one or more of rotational velocity of each wheel, said steering angle, throttle or brake pedal position to provide one or more of stability control, traction control, active brake bias control and active wheel speed differential control as determined by frequency modulation patterns stored in microprocessor read only memory; and wherein said microprocessors input is adapted to apply anti-lock braking characteristics to said second variable breaking force when said sensors record disparate rotational velocities.