Three motors, if coupled with the governor speed, is it necessary to add the inverter?
?Fifth, the hydraulic coupler speed: hydraulic coupler is a hydraulic transmission device, generally composed of the pump wheel and turbine, when the pump wheel in the prime mover driven under the rotation, in which the liquid is driven by the blade and rotation, in the Under the action of centrifugal force along the outer ring of the pump wheel into the turbine, in the same turn to the turbine blades to thrust, to drive the production machinery operation. Through different hydraulic (lubricants and turbines) to achieve speed.
?Fourth, the electromagnetic speed: electromagnetic speed motor by the cage motor, electromagnetic slip clutch and DC excitation power. DC excitation power is small, usually by single-phase half-wave or full-wave thyristor rectifier composition, change the thyristor conduction angle, you can change the size of the excitation current.
??Third, the cascade speed: Cascade speed refers to the winding motor rotor loop in the adjustable resistance to change the motor slip, to speed the purpose of the past, the most widely used.
?Second, the variable speed: change the way the stator winding wiring to change the cage motor stator pole pairs to speed.
First, the frequency control: the use of frequency converter to change the frequency of the motor stator power supply, thus changing its synchronous speed control method for all motors, which is the most advanced, the most widely used speed control method.
