H2W Technologies LCAM 5/15 Operation & Service Manual - page 7
H2W Technologies, Inc., 26470 Ruether Ave. #102, Santa Clarita, CA 91350, U.S.A. (888) 702-0540
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Use the following relationships to calculate amplifier dissipation :
1) Pd = Im x Vb (watts)
Where: Pd = Total watts delivered from bus
Im = Motor current
Vb = Bus voltage
2) Pm = Im x Vm (watts)
Where: Pm = Total power (watts) dissipated in motor
Vm = Motor voltage
3) Pa =Im x Vb - Im x Vm
Where: Pa = Total watts dissipated at amplifier
From the above relationship, it can be surmised that the worst case dissipation occurs when the
amplifier has to deliver a high continuous current at a low motor speed, i.e., less motor BEMF and
more current. For some applications, a power resistor can be added in series with the motor thus
shifting some of the power dissipation from the amplifier to the resistor.