How to calculate the output power of a Servo Drive
Power in a Y-wired motor
The following diagram shows the electrical model of a Y-wired BLAC motor:
The power in any motor can be calculated as the sum of each phase power (product of RMS current and RMS voltage). In the case of a phase-balanced motor:
where Vph−ph is the RMS voltage difference between two output terminals of the Servo Drive. The use of the Space Vector Modulation (SVM) allows the use of all the DC-bus voltage as line voltage amplitude.
where D is the applied duty cycle.
Therefore, the power delivered to the motor power can be defined as:
From the point of view of a Servo Drive, the power provided to a Δ-wired motor is exactly the same. However, the voltage and current values are shared different within the phases:
where Iine is the RMS current seen at the Servo Drive output terminals.
Therefore, the total power in a Δ-wired motor results as:
Which, from the point of view of a servo drive, is equivalent to (4).
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