Suspension type high vacuum roll coating machine request of winding control high precision torque control, is generally driven by DC, but along with the rapid development of AC drive technology, now gradually by AC permanent magnetic synchronous servo motor or AC induction motor drive. Danfoss FC302 series drives with the driving performance of servo and AC asynchronous motor drive also realize a smooth torque control, this industry provides an easy to use solution, users need only a few simple parameter settings, can meet the needs of actual production, operation and debugging is also very simple.
Transmission structure of suspension type high vacuum winding type coating machine:
Turning to positive
Turning to negative
3 drive suspension type high vacuum winding type coating machine typical transmission structure, which:
M1 for the cooling roller, a constant diameter, driven by a FC302, the speed of the cold roll that is coated with the line speed.
M2 for the roll, the center winding, the diameter gradually larger, driven by a FC302, to provide the winding tension.
M3 for roll roll, center winding, the diameter gradually smaller, driven by a FC302, to provide tension.
The steering of cooling roller and roll up roll is fixed, but the roll up roll is different from the winding direction, there are two kinds of steering, reverse and positive two kinds of torque.
Characteristics of transmission system of vacuum coating machine:
1 because the vacuum chamber is small, the tension detection device can not be installed, so the winding tension depends entirely on the direct control of the motor. Therefore, the winding drive is working in the torque mode. For lighter and thinner materials, the roll must have tension taper function.
2. Due to the process, main transmission cooling and no pressure and cooling, therefore, and can only rely on friction to drive the film, and the unwinding tension difference between the larger, the films were easily skidding on the cooling roller. How to prevent slipping is a difficult problem in drive control.
Two, control system structure:
Coiling Danfoss FC302+MCO305 and mco305 on the main, from the two encoder interface. The main encoder interface signal from the cooling roller encoder, responsible for the line speed signal acquisition; from the encoder signals from the motor encoder collected the machine speed, and flux vector control of the source of the feedback.
The configuration and control method of the volume is the same as the control method.
Cooling roll control is relatively simple, mainly responsible for the constant line speed control and meter.
PLC is responsible for the general digital logic control, and all the calculations are done in the motion controller MCO305.
Coil diameter calculation:
According to the same principle of line speed:
Can calculate the diameter and diameter on close curly curly.
Winding tension taper control:
The current tension can be calculated with the current volume of the coil and the set value of the tension taper. Tension and coil diameter relationship, when the taper tension is 0, tension remains constant, equivalent constant tension control; when the taper tension was 100% when the roll diameter increased per 1 times, tension dropped by half, quite constant torque control.
The calculation formula is as follows:
Where: D for the current volume diameter
Dmin for minimum volume
Tap for tension taper
Tref reference value of tension taper for tracking small diameter
When Ttap=Tref, Tap=0
When Ttap=, Tap=1
Acceleration and deceleration torque and friction torque:
In order to achieve high precision tension control, friction torque and acceleration and deceleration torque compensation must be added to the program.
Acceleration torque T beta = beta x J
The angular acceleration;
Moment of inertia J=
Three, the end of the language:
Actual operation proves that can fully meet the requirements of control winding vacuum film plating machine in scheme to solve the Danfoss FC300 +MCO305 motion controller is. The speed of the whole machine is more than the original control method, which greatly reduces the waste of raw materials. Control system debugging and parameter settings are more convenient. Most customer satisfaction is the motor can be used to compare the economic AC induction motor, in the tension control accuracy requirements of the occasion to upgrade the use of AC permanent magnet synchronous motor. Since the FC302 can not only drive the induction motor, but also can drive the synchronous motor, the system can only need to replace the motor when the system is upgraded.