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.
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
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
our Application Department with your system profiles and
loads.
Psr Pld
Vmax * TRMS
TPL ++=
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