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快乐十分选5中3有钱吗 Variable frequency inverter (AC motor speed drive, VFD) manufacturer & supplier in China

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Variable frequency AC drive control mode

May 21, 2012 00:00 AM

Generally variable frequency AC drive快乐十分选5中3有钱吗 has following control modes: open loop vector control, V/F control, open loop torque control, closed loop vector control, slip frequency control.

Open-loop vector control
Apply to high performance general-purpose application with no PG encoder, one AC drive controls an electric motor only. Such as machine tools, centrifuge machines, wire drawing machine, injection molding machine, etc.

V/F control
Suitable for the applications do not need high control precision, like fans and pumps. The variable frequency drive快乐十分选5中3有钱吗 can be used for dragging multiple motors.

Open-loop torque control (without PG card)
快乐十分选5中3有钱吗Suitable for the system require less torque control accuracy, such as wire-wound, drawing machines, etc. In torque control mode, the speed of the motor is determined by the loads on the motor, its acceleration and deceleration speed is no longer controlled by the variable frequency drive acc/dec time.

Tip: in vector control mode, you need to know more about the electric motor parameters, in order to get full advantages of the vector control AC drive.

Slip frequency control
Slip frequency control is direct controlling the torque, which is based on the V/f control mode, in accordance with the actual speed of the induction motor corresponding power frequency, adjusting the variable frequency drive's output frequency with desired torque, therefore make the induction motor have a corresponding output torque. In this control method, needs to install a speed in the control system, sometimes needs to install additional current feedback to control the frequency and current. So it is a closed-loop control mode, the frequency drive has a good stability, and has a great response characteristics for fast acceleration and deceleration and load changes.

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