FAST unified observer structure exploits the similarities between all motors that use magnetic flux for energy transduction:

• Supports both synchronous (BLDC, SPM, IPM) and asynchronous (ACIM) control.
• Provides salient compensation for interior permanent magnet motors. Observer tracks rotor flux and angle correctly when Ls-d and Ls-q are provided.

FAST offers unique, high-quality motor feedback signals for control systems:

• High-quality Flux signal for stable flux monitoring and field weakening.
• Superior rotor flux Angle estimation accuracy over wider speed range compared to traditional observer techniques independent of all rotor parameters for ACIM.
• Real-time low-noise motor shaft Speed signal.
• Accurate high-bandwidth Torque signal for load monitoring and imbalance detection.

FAST replaces mechanical encoders and resolvers, and accelerates control system design:

• Angle estimator converges within first cycle of the applied waveform, regardless of speed.
• Stable operation in all power quadrants, including generator quadrants.
• Accurate angle estimation at steady state speeds below 1 Hz (typical) with full torque.
• Angle integrity maintained even during slow speed reversals through zero speed.
• Angle integrity maintained during stall conditions, enabling smooth stall recovery.
• Motor Identification measures required electrical motor parameters of unloaded motor in under 2 minutes (typical).
• "On-the-fly" stator resistance recalibration (online Rs) tracks stator resistance changes in real time, resulting in robust operation over temperature. This feature can also be used as a temperature sensor of the motor's windings (basepoint calibration required).
• Superior transient response of rotor flux angle tracking compared to traditional observers.
• PowerWarp™ adaptively reduces current consumption to minimize the combined (rotor and stator) copper losses to the lowest, without compromising ACIM output power levels.