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Description
Overview
Essential details：A06B-6077-H106 SERVO POWER CONVERTER FANUC
The power loss not only increases the power consumption of the system, but also translates into heat. System heat must be drained, as increased temperature deteriorates system operation (increasing power loss, component drift, and electrical noise) and reduces component life expectancy. In addition, heat dissipation measures are costly and do complicate high-density integration and size reduction. For all these reasons, minimizing power loss should always be the goal of a servo drive system.
efficiency
Efficiency (η) is defined as the ratio between the output mechanical power (Pout) and the input electrical power (Pin).
η = pout/pout
In a DC servo drive motor, the input power is the power provided by the power supply or battery system. When using a single power supply, the Pin can be calculated as:
Pin = Vbus * Ibus
Where Vbus is the DC voltage of the power supply (between POW_SUP and GND_P terminals), and Ibus is the current provided by the power supply.
However, when the servo drive uses dual power supplies (different power supplies of the power supply and the logic power supply), these two power supplies must be considered. In a dual power system, the Pin can be calculated as follows:
Pin = Vbus* Ibus + Vlogic * Ilogic
Vlogic is the voltage of the logic power supply (between +LOG_SUP and GND_D terminals), and Ilogic is the current provided by the logic power supply.
A06B-6077-H106
The output power is the mechanical output power provided by our motor and is defined as:
Pout = ωout * τout
Where ωout is the output rotation speed in rad/s, and τout is the output torque in N·m.
Power loss in servo drive
All components in the system have losses and thus contribute to the heating of the system. The mechanical loss is mainly generated on bearings and gears, and the motor loss is mainly composed of the resistance loss on the winding and the magnetic loss on the magnetic core. For more information on mechanical and motor losses, please refer to the manufacturer’s data.
The power loss in servo drivers is mainly caused by the power stage, which converts from the DC input power supply to the AC output voltage. However, other modules in the servo drive can cause power loss. The diagram shows a block diagram of the main power loss source in a servo drive.
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