B - Operations – Transporting – 60 – L
Patent
B - Operations, Transporting
60
L
342/34.4
B60L 11/18 (2006.01) H02K 29/00 (2006.01) H02P 6/00 (2006.01) H02P 6/08 (2006.01)
Patent
CA 1237184
ABSTRACT OF THE DISCLOSURE 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 availablity 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.
426809
Gritter David J.
O'neil Walter K.
Turner David
Borden Ladner Gervais Llp
Corporation Eaton
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