Emerson P/N 400518-02 User Manual
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Epsilon EP-I Indexing Drive and FM-2 Indexing Module Reference Manual
Power Dissipation Calculation
Calculating actual dissipation requirements in an application can help minimize enclosure cooling requirements, especially
in multi-axis systems. To calculate dissipation in a specific application, use the following formula for each axis and then total
them up. This formula is a generalization and will result in a conservative estimate for power losses.
in multi-axis systems. To calculate dissipation in a specific application, use the following formula for each axis and then total
them up. This formula is a generalization and will result in a conservative estimate for power losses.
Where:
TPL = Total power losses (Watts)
TRMS = RMS torque for the application (lb-in)
Vmax = Maximum motor speed in application (RPM)
Pld = Logic Power Losses Drive (Watts)
Psr = Shunt Regulation Losses (Watts)-(RSR-2 losses
TRMS = RMS torque for the application (lb-in)
Vmax = Maximum motor speed in application (RPM)
Pld = Logic Power Losses Drive (Watts)
Psr = Shunt Regulation Losses (Watts)-(RSR-2 losses
or equivalent)
Note
TRMS * Vmax / 1500 = Power Stage Dissipation = Pp
A more accurate calculation would include even more specifics such as actual torque delivered at each speed plus actual shunt
regulator usage. For help in calculating these, please contact the Application Department at Control Techniques with your
system profiles and loads.
regulator usage. For help in calculating these, please contact the Application Department at Control Techniques with your
system profiles and loads.
Psr
Pld
1500
Vmax
TRMS
TPL
+
+
•
=