초록 ▼

A drivetrain (48) for an electric passenger vehicle (10) includes a battery (40) for energizing a single-phase A.C. traction motor (18) which drives a ground engaging wheel (12) through a multi-speed transaxle (20). The motor is characterized by an external ferrite permanent magnet rotor (26) drivin

A drivetrain (48) for an electric passenger vehicle (10) includes a battery (40) for energizing a single-phase A.C. traction motor (18) which drives a ground engaging wheel (12) through a multi-speed transaxle (20). The motor is characterized by an external ferrite permanent magnet rotor (26) drivingly engaging an input shaft (32) of the transaxle. The motor is controlled by an inverter circuit (44) and a control circuit (46) which generates switch command signals to reciprocally actuate power transistors (56 and 62) within the inverter circuit as a function of operator demand, rotor position and rotor speed. The control circuit includes a motor positioning circuit (442) which toggles the motor current when the rotor speed falls below a predetermined level to dither the rotor about a park position for a predetermined period. A pre-start rotor positioner (224) is provided to mechanically lock the rotor in its park position to ensure the availability of a high electrical starting torque. Finally, a minimum starting speed circuit (599) provides for motor startup from other than the normal rotor park position.

대표청구항 ▼

An improved drivetrain of the type adapted for use with an electric vehicle having at least one tractive wheel and a motor including a stator and rotor for imparting torque to said wheel upon the energization thereof, said improvement comprising: means operable for rotation with said rotor and defin

An improved drivetrain of the type adapted for use with an electric vehicle having at least one tractive wheel and a motor including a stator and rotor for imparting torque to said wheel upon the energization thereof, said improvement comprising: means operable for rotation with said rotor and defining an engagement surface; and actuator means comprising, (i) pawl means displaceable between a retracted position spaced from said engagement surface and an extended position wherein said pawl means contacts said engagement surface to substantially prohibit rotation of said rotor, (ii) means biasing said pawl means toward said extended position, (iii) means operable to urge said pawl means into said retracted position independently of rotor position in response to an actuation signal, and (iv) latch means including a member displaceable between a release position and a lock position to lock said pawl means in said extended position in the absence of said actuation signal.