90
Motor Measurement (Motor Analysis-Equipped Model)
Equations
When the torque meter correction is enabled:
(Torque value) = S
×
[X − (Zero-correction value)] − At − Bt
At = atc − att*
Bt = btc*
S: Scaling
X: Input signal-to-torque converted value
At: Nonlinearity target value
Bt: Target friction value
atc: Torque calibration value of nonlinearity correction table
att: Torque calibration point of nonlinearity correction table
etc: Torque calibration value of friction correction table
*: Target values between the entered calibration points are calculated by linear interpolation.
• The calibration values should be obtained by the customer through calibration or contact the
torque meter manufacturer.
• Zero adjustment of the motor analysis also applies to osets of devices, including torque meters,
regardless of whether the correction function is enabled or disabled.
• The instrument does not indicate about zero for a torque value outputted when no torque
is generated or the motor is not rotating because it corrects measured values by applying
calibration values after zero adjustment. Performing zero adjustment of this instrument sets the
osets of the entire system, including itself, to zero; thus, you should usually set the calibration
value of the zero-torque point to zero.
• If you have torque meters’ information on hysteresis characteristics or drift that occurs during
a test, entering the calibration value of the zero-torque point will enable more accurate
measurement.
• The unit of torque, newton-meter (N•m) in this section, varies depending on the setting.
• Correction values for points that exceed the measuring range will not be used in the correction
calculation.
• When calibration values are expressed in % of full scale (% f.s.), the following equation can yield
the calibration values you can enter.
(Calibration value to be entered) = (f.s. of torque meter)
×
(% of full scale)
• Torque meter correction is valid only values within the range of set torque calibration points. If you
want to correct for torque values outside the range, set a wider range of torque calibration points.
To Next Page
Loading...
Need help?
General
