Back EMF measurement to overcome the effects of motor temperature change
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United States of America Patent
Stats
-
Mar 11, 2008
Grant Date -
Jun 8, 2006
app pub date -
May 21, 2003
filing date -
May 21, 2002
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A motor torque measurement system includes a motor in communication with a gyro, a centrifuge rotor connected to the gyro, a housing surrounding the rotor and motor, and a controller in communication with the motor. The controller is connected to a back EMF measurement device, which measures the back EMF of the motor, and is also configured to measure motor rotational speed. The back EMF coefficient (Ke) and motor torque constant (Kt) can be calculated therefrom and the actual motor performance thereby determined. Motor magnet temperature may also be calculated. Back EMF and motor rotational speed measurements may be taken with the motor coasting.
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