System Power Requirements - Aerotech XR3 Hardware Manual

XR3 Hardware Manual

1.1.1. System Power Requirements

The following equations can be used to determine total system power requirements. The actual power
required from the mains supply will be the combination of actual motor power (work), motor resistance
losses, and efficiency losses in the power electronics or power transformer.
Use an EfficiencyFactor of approximately 90% in the following equations.
Brushless Motor
Output Power
Rotary Motors
Linear Motors
Rotary or Linear Motors
Power Loss = 3 * I(rms)^2 * R(line-line)/2
Power Input = (Power Output + Power Loss) / EfficiencyFactor
DC Brush Motor
Power Output [W] = Torque [N·m] * Angular velocity[rad/sec]
Power Loss = I(rms)^2 * R
Power Input = (Pout + Ploss) / EfficiencyFactor
Linear Motor
Power Dissipation [W] = MotorCurrentPeak[A] * TotalBusVoltage[V] * 3 / 2
Power Input = (Power Dissipation) / EfficiencyFactor
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Power Output [W] = Torque [N·m] * Angular velocity[rad/sec]
Power Output [W] = Force [N] * Linear velocity[m/sec]
Power Output [W] = Bemf [V] * I(rms) * 3
Chapter 1: Introduction
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