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Home » Applications » Variable frequency drive for winding solution

Variable frequency drive for winding solution to replace torque motor

Technical Requirements:
The features torque motor: softer mechanical feature. When the setting torque is greater than the load torque, it will accelerate automatically, vice versa, when the setting torque is less than the load torque, it will decelerate or reverse, and when the setting toque is equal to the load torque, the rotational speed of motor remains unchanged.

The torque output of torque motor, set by the controller, is applicable to constant tension wind-out and winding control, such as textile, wire, cable, metal processing, papermaking, rubber, plastic and printing machine etc.
The general variable frequency drive can only be used for AC motor open loop speed regulation, while the motor torque is out of control, so it doesn't possess the function of torque motor.

The current vector control variable frequency drive: Through complicated and accurate vector control algorithm, torque current closed loop control can be achieved for directly setting the output torque of regular induction motor control, replacing the above functions of torque motor and even obtaining higher performance.

Torque Motor and AC Induction Motor
Torque Motor and AC Induction Motor

Torque Wind-up of Film Printing Machine
Torque Wind-up of Film Printing Machine

Variable frequency drive system configuration:
1. Regular 3-phase induction motor: Select the number of poles and power of 3-phase induction motor based on the needs for the maximum revolution and torque in applications.
2. Open loop variable speed drive with current vector control, built-in braking unit, braking resistor selected according to motor power.
3. Regular induction motor acts constant torque control. The tension of motor can be directly set and controlled to replace torque motor without speed feedback of encoder.

Variable frequency drive system features:
1. No need for external tension detection mechanism and speed feedback encoder, simple system structure, easy for installation and commissioning.
2. The torque motor system is easily to be damaged by over-heat or improper operation. Present solutions can effectively help to protect the motor and easy for maintenance. The system is safe and stable with a long life-span.
3. The control accuracy of torque is higher than that of torque motor.
4. The taper torque can be set as auto-control mode.
5. With static friction torque compensation and large inertia acceleration torque compensation, the higher winding control performance, easy for operation.

Other Applications:

AC Drive Inverter for Paper Machines AC Drive Inverter for Paper Machines Speed regulation accuracy of transmission system is required to be 0.1%. The frequency accuracy of drive inverter should be 0.01Hz. The analog signal is exposed to electromagnetic interference which impacts the transmission precision and stability of paper machine. In order to enhance the accuracy and stability of system and anti-interference ability, the system takes PLC as the main drive unit, acceleration or deceleration at each step is controlled by button.
AC drive for belt conveyor AC drive for belt conveyor Energy saving: In normal condition, the mining motors’ power rating are enlarged too much to ensure the safety operation, but they don’t work at full load in most of the time, and it will cause huge electric loss while in light load or without load. After using of the variable frequency drive in the system, the speed of the belt can be adjusted automatically as the change of the load.
AC inverter drive for veneer peeling AC inverter drive for veneer peeling The upgraded AC inverter drive controlled veneer peeling without the clamper, the round wood is not lamped by the clamping jaw, and the clamping has no relationship with the quality of wood. The wood block with uniform thickness and same length can be processed by adjusting the rotary cutting speed and shearing speed, on the premise of precision satisfaction to increase the processing efficiency and utilization rate of wood.