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Alternative torque motor solution

2015-03-20

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1. The system introduction
Most of the current wire processing equipment needs to carry out the spooling of the finished product. In the past, the torque motor was used to drive the I-shaped wheel to take up the line. After the pre-stage treatment, the material needs to be tightened on the I-shaped wheel according to a certain tension requirement. The torque motor drives the winding-up wheel and is set by the torque motor controller. The winding tension, the driving torque motor maintains the set tension; the winding portion does not have a detecting device that supplies a signal for feeding back the current tension. However, this method consumes a lot of energy, and the torque motor and the controller are expensive to maintain.

V&T gives full play to its own advantages, and firstly proposes and promotes the open-loop torque scheme without speed encoder feedback in the domestic inverter, removes the torque motor and its controller, installs the ordinary asynchronous motor; adopts V&T tension control The special inverter drives the asynchronous motor; the tension can be set by analog or digital. The solution does not need to install the encoder signal for feedback motor speed, and does not need any feedback signals such as tension frame and tension sensor. The product adopts advanced torque control algorithm to identify and decouple the working current of the motor, as well as the internal pair. The automatic calculation of the winding diameter realizes the precise torque control of the asynchronous motor to obtain the constant tension control performance of the wire winding superior to the torque motor.



news-Alternative torque motor solution-VT Technologies-img



2. The process introduction:
Synchronously close the line. During the working process of the equipment, since the line speed of the starting operation or the pre-processing wire may be adjusted at any time, it is required that the subsequent stage winding must always follow the current running speed of the preceding stage. If the following level is slower, the thread on the spool will be loose or even chaotic. If the rear stage follows fast, it may cause local draft deformation or even break the line. Therefore, the torque control of the motor is required to be stable and responsive.

Empty roll full volume starts or stops. In actual work, no matter how much the wire is wound on the current spool, that is to say, regardless of the size of the winding diameter, there may be requirements for starting or stopping; especially in the case of full volume, the current I-shaped wheel is the heaviest, and the inertia is also The biggest, plus the consideration of friction, system inertia and other factors and air volume are very different. Therefore, it is required that the starting torque of the motor can be large and stable, and the change of the actual demand torque caused by the change should be compensated with the change of the winding diameter. The braking torque is large at the time of rapid shutdown and the output is stable to ensure the synchronous performance. it is good.

Runs in full speed range. Due to the mechanical design, it is necessary to take into account the tensile moments at low speed and high speed. Once the rotation ratio is determined, the winding motor may work at a very low speed (such as 1 Hz), and it may work at a very high speed. Even the motor will work in the constant power zone. Therefore, regardless of the load size, the speed fluctuation of the motor is small, and the torque output is large and stable when operating in the low speed or weak magnetic field.

Cable. Usually, the finished wire is layered on the spool. On the horizontal axis of the spool, the wire should be arranged in a circle and a parallel from one segment of the horizontal axis to the other to achieve a layer; The ground thickening finally realizes a roll of finished products. This requires a wire arranging device to complete the alignment of the wire at the upper end to the lower end of the horizontal axis. According to the requirements of mechanical design, there are many ways to realize the cable, such as mechanical, frequency conversion, or servo.
Emergency stop. When an emergency occurs during the operation of the equipment, the entire equipment is required to stop as quickly as possible. At this time, the stretching and winding motor is in a state of rapid deceleration, and the wire is not pulled off after the end of the shutdown process, so that the next time can be smoothly started.

3. The characteristics of V&T products:
The winding adopts torque open-loop control, which eliminates the need of external acceleration feedback encoder signal, saves cost and completely eliminates the interference from the exclusion zone, and ensures that the operation will not be interrupted due to interference, disconnection, and speed fluctuation. The winding torque control has high precision, can accurately provide the tension required by the user and respond quickly to the tension given, ensuring uniform thickness of the processed material. The winding part starts to stop smoothly, especially at low speed, the tension control is stable, and the wound wire is not thinned or broken.

The torque output capability is strong, and the rated torque or up to 2.0 times the rated torque can be continuously provided in the full speed range, and the adaptability to the winding diameter is strong. The advanced torque current recognition algorithm can automatically compensate the moment of inertia according to the current disk diameter, the friction force during sliding, and adopt the intelligent winding diameter identification, which has high recognition accuracy and strong anti-rotation ability, thus fundamentally It ensures consistent tension control characteristics during wire processing.

Precise tension control, especially to provide a constant constant tension during dynamic acceleration and deceleration;

Completely replace the original torque controller plus torque motor solution, the original operating habits are unchanged when using inverter and common asynchronous motor solutions.
Energy-saving effect is obvious and reliable, perfect torque current control technology, no additional heat energy consumption;
The original torque motor heat is inefficient and fragile. The current inverter solution can guarantee accurate torque output without additional heat energy consumption and prolong the service life of the whole system.

Eliminates the need for additional encoder speed feedback, saving cost and completely eliminating the downtime and speed fluctuations caused by interference;
Fourth, the overall program overview
Winding part selection: V6−H−4T** (volume diameter calculation is not supported)
V6−T−4T** (supports roll diameter calculation)

The torque control method (Pd.00=1) in vector control mode (P0.03=4) is adopted.

In order to ensure normal operation after the torque motor retraction process, it is necessary to re-rotate the motor shaft side load completely and then rotate the self-tuning; it is recommended that the user should match the number of poles of the original torque motor when the replacement torque motor is modified. In order to avoid the speed of the asynchronous motor after the transformation is too high.
If only the constant torque control on the line is made, the target torque can be achieved by the analog quantity; if it is considered that the torque setting on the line changes automatically as the winding diameter of the winding wheel changes continuously, It is also necessary to do on-line constant tension control, which needs to be sent to the current line speed of the front stage operation, and the current coil diameter can be automatically calculated in the inverter machine, so that the analog quantity can directly give the target tension.



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