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1, drawing machine
metal wire drawing machine is an important processing equipment, it belongs to impact loads. Quality and efficiency of its production is of utmost importance for the enterprise. Atmosphere can pulleys wire drawing machine, live sets, linear, three. With the development of production technology, electric AC frequency conversion control technology and PLC program control has been gradually replacing DC motors and torque motors, to establish a dominant position.
2, wire drawing machine drive requirements
(1) requires up to 150% when the inverter 0.5HZ starting torque.
(2) required to achieve more than the proportion of transport control, with the load and voltage changes can automatically adjust the output frequency to achieve speed unchanged.
(3) have a RS485 communication and PLC, PC machine to achieve communication and control.
(4) the use of DC bus control of, energy-saving effect.
3, the traditional use of V / F control or space vector control inverter shortcomings
(1) the traditional V / F converter low-frequency, torque is not enough.
(2) When the load and voltage changes, will have speed instability and, therefore, not accurate ratio control linkage, only without sense of vector control to control the motor slip.
(3) operation in the process of drawing machine motor and generator load characteristics often occur in the load characteristics of the motor, the motor The slip is positive, and changes with the load changes; the other hand, when the load characteristics for the generator, the motor slip is negative, easily more than synchronous speed, the size of the negative characteristics of plants and generators in proportion, so not high accuracy ratio control linkage.
4, the application of the inverter in the drawing machine features
converter products for use in wire drawing machine, the proportion of linkage in more than one can ask when used together with a way to control the DC bus, saving better. Its main features are as follows:
(1) with no sense of vector control technology, with low speed high torque characteristics, 0.5HZ up to 150% torque output characteristics .
(2) with the ratio of speeding operation of the mechanical design can increase 1.5 times the starting torque characteristics.
(3) more than the proportion of linkage can be designed to successfully use the DC bus, not your brakes, you can quickly shut down.
(4) speed and high precision, with the slip compensation function.
to a Cable Co., Ltd. following the drawing machine transformation as an example, drive strengths and use:
drawn ferrous and non ferrous metals, each winch rotation at different speeds, the speed can be precisely synchronized pull system can prevent off, high-speed system to ensure precise control of contact and the maximum system working.
1) Device Summary
copper wire cable
5mm diameter before stretching line after line stretch 1mm
wire-speed 50Hz operation 703m / min
take-up spool diameter 300mm diameter 400mm
2) drive
control - the proportion of linked
braking resistor - no (with shared DC bus)
control accuracy - regardless of inverter is used as a generator or motor characteristics of the slip motor are planting the same (with automatic parameter identification and automatic slip compensation), so the proportion of linkage can be very accurate. |
