MA300GQ-P Datasheet, PDF (17/18 Pages) MPS Industries, Inc. – Angular Sensor for 3-Phase Brushless Motor Commutation and Position Control with Side-Shaft Positioning Capability

MA300
Angular Sensor for 3-Phase Brushless Motor
Commutation and Position Control with Side-Shaft
Positioning Capability
Appendix A: Definitions
Resolution (3 σ Noise Level)
Refresh rate
The smallest angle increment distinguishable from the noise. Here the
resolution is defined as 3 times σ, the standard deviation in degrees,
taken over 1000 data points at a constant position. The resolution in bits
is obtained with:
σ.
Rate at which new data points are stored in the output buffer.
Latency
The time between when the data is ready at the output, and the instant at
which the shaft passes that position. The lag in degrees is
, where is the angular velocity in deg/s.
Power-Up Time
Starting at power-up, the time until the sensor delivers valid data.
Integral Non-Linearity (INL)
Maximum deviation between the sensor output and the best line fit (see
Figure A1).
Jitter
400
350
300
250
200
150
100
50
0
0
lag
ideal
sensor output
INL
resolution
( ± 3 )
100 200 300 400 500
rotor position (deg)
sensor out
best straight fit
600 700
Figure A1: Absolute Angle Errors
For the incremental output maximum fluctuation of the angular position of
the raising edges.
Overall Reproducibility
Maximum variation between two readings, successive or not, of the
same shaft position at a fixed magnetic field over the complete
temperature range.
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Reserved. MA700 Rev 1.0 September 2014
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