Motor electrical positioning system and the application thereof

Details Motor electrical positioning system and the application thereof Motor electrical positioning system and the application thereof

1986-04-24

1987-10-06

Smith, Jr., David

Electricity: motive power systems

Switched reluctance motor commutation control

318138, 318701, H02K 2900

Patent

active

046985620

ABSTRACT:
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 multispeed 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 prestart 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.

REFERENCES:
patent: 3456174 (1969-07-01), Moczala
patent: 4431953 (1984-02-01), Schray et al.
patent: 4455513 (1984-06-01), Fulton et al.
patent: 4484114 (1984-11-01), Ebbs

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