Datasheet

FAST Estimator Features

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2 FAST Estimator Features

• Unified observer structure which exploits the similarities between all motors that use magnetic flux for

energy transduction

– Both synchronous (BLDC, SPM, IPM), and asynchronous (ACIM) control are possible

– Salient compensation for Interior Permanent Magnet motors: observer tracks rotor flux and angle

correctly when Ls-d and Ls-q are provided

• Unique, high quality motor feedback signals for use in 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

• 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 (typ) 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 (typ)

• "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

3 InstaSPIN™-FOC Solution Features

• Includes the Flux Angle Speed Torque (FAST) estimator, used to measure rotor flux (both magnitude

and angle) in a sensorless field-oriented control (FOC) system

• Automatic torque (current) loop tuning, with option for user adjustments

• Automatic speed loop tuning provides stable operation for most applications. (Better transient response

can be obtained by optimizing parameters for a particular application)

• Automatic or manual field weakening and field boosting

• Bus Voltage compensation

• Automatic offset calibration insures quality samples of feedback signals

TMS320F28026F, TMS320F28027F InstaSPIN™-FOC Software SPRUHP4–August 2013

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