Control system for an interior permanent magnet synchronous machine

Patent Application · Wed Oct 12 00:00:00 EDT 1988

OSTI ID:5402204

Bose, B K

A high performance, fully operational, four-quadrant control scheme is used in an interior permanent magnet synchronous machine. The machine operates smoothly with full performance in the constant-torque region as well as in the flux-weakening, constant-power region in both directions of motion. The transition between the constant-torque and constant-power regions is very smooth under all conditions of operation. Control in the constant-torque region is based on a vector or field-oriented technique, with the direct-axis aligned with the total stator flux, whereas constant-power region control is accomplished by orientation of the torque angle of the impressed square-wave voltage through the feedforward vector rotator. In a preferred embodiment, the control system employs a digital distributed microcomputer controller arrangement which relies upon various precisely estimated feedback signals, such as torque, flux, etc. The control scheme includes an outer torque control loop primarily for traction type applications, but also contemplates speed and position control loops for various industrial drives. A 70 hp drive system using a Neodymium-Iron-Boron permanent magnet machine and transistor pulse width modulating inverter has been designed and successfully tested. This control scheme also has application in controlling surface permanent magnet machines. 16 figs.

• Research Organization: Ford Motor Co., Dearborn, MI (United States)
• Sponsoring Organization: USDOE; USDOE, Washington, DC (United States)
• DOE Contract Number: AC07-85NV10418
• Assignee: Dept. of Energy
• Patent Number(s): PATENTS-US-A7256432
• Application Number: ON: DE91016971; PPN: US 7-256432
• OSTI ID: 5402204
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
33 ADVANCED PROPULSION SYSTEMS
ELECTRIC MOTORS
DESIGN
ELECTRIC CONTROLLERS
ELECTRIC-POWERED VEHICLES
ENERGY EFFICIENCY
FEEDBACK
INVENTIONS
PERFORMANCE TESTING
PERMANENT MAGNETS
SYNCHRONIZATION
TORQUE
CONTROL EQUIPMENT
EFFICIENCY
EQUIPMENT
MAGNETS
MOTORS
TESTING
VEHICLES
426000* - Engineering- Components
Electron Devices & Circuits- (1990-)
330300 - Advanced Propulsion Systems- Electric-Powered Systems