Fire-Extinguishing System and Method for Operating Servo Motor-Driven Foam Pump

摘要

Embodiments of the invention provide a fire-extinguishing system and method for injecting foamant into a stream of water. The system can include a flow meter determining a flow rate of the stream of water and a foam pump having an inlet coupled to a supply of foamant and an outlet coupled to the stream of water. The system includes a servo motor driving the foam pump. The servo motor includes a sensor used to determine a rotor shaft speed and/or a rotor shaft torque.

主权项

1. A method of controlling a motor, the method comprising:
monitoring a current temperature of windings of the motor and a power stage of the motor substantially continuously and substantially in real-time; determining whether the current temperature approaches a maximum rated temperature of the motor; removing power from the motor for a first time period; pulsing power to the motor for a second time period after the first time period has elapsed; tailoring pulse shapes of the power provided to the motor for the second time period.