Shenzhen Xcool Vapor Technology Co.,Ltd , http://www.xcoolvapor.com
1. Synchronous servo or induction servo motor must be based on the needs of the system's torque, including the servo motor, mechanical system's inertia, efficiency, friction loss and other factors to select the appropriate form and power.
When selecting the motor, please pay attention to:
1) The lower the inertia of the low inertia, the better, otherwise it will lose a lot of torque to overcome its own inertia.
2) Appropriate rated speed and deceleration ratio When selecting the motor specification, it should be considered together with the deceleration mechanism. The best match is when the motor runs at the highest speed, that is, the highest reasonable operating speed of the machine's cutter (taking into account mechanical tolerance Force, and practical application requirements). In particular, when using an induction motor equipped with an encoder to match, it is necessary to consider the appropriate reduction ratio and motor speed configuration. Because the torque output efficiency of the general asynchronous motor is in the vicinity of the rated speed region, the torque output efficiency is relatively poor in the low speed region; so if you choose the 1500rpm motor, it will only operate at about 500~600rpm. In the interval, it is necessary to change the reduction ratio so that the motor operates at 1100 to 1400 rpm, or uses a 750 rpm motor instead, so that the torque output efficiency of the motor can be exerted.
3) If a standard servo motor can be used, it will have better results than using a general induction type asynchronous motor.
2. The servo driver must be selected according to the maximum torque requirement of the system and the selected maximum rated current of the servo motor. The driver must have a pick-up and discharge function, which can be connected to an external discharge resistor (model with a discharge circuit) or an additional brake and then a discharge resistor (models without a discharge circuit). For details, consult our technical service consultant.
3. The mainline speed measurement encoder is selected based on the accuracy requirements and the mechanical parameters. The selected specifications of the encoder need to pay attention to:
1) Operating voltage 5V
2) The output part is Line Drive, differential signal, incremental type.
3) There are A, /A, B, /B signals.
4) To match the outer diameter of the measuring wheel and the reduction ratio, the measurement accuracy must meet the requirements of cutting accuracy.
If a 1024ppr encoder is used with a measuring wheel with a circumference of 400mm, if the speed reduction ratio is 1, the measuring accuracy is 400/1024*2=0.78mm, which can be applied to the measurement of ±1mm accuracy, but not to ±0.8 Measuring accuracy below mm. To increase the measurement accuracy, you must increase the encoder accuracy or increase the reduction ratio to increase the pulse output per unit length.
4. The man-machine interface can plan suitable operation screens for data input, action switching and system monitoring.
5. The closeness of the tangential proximity switch The accuracy of the proximity switch signal directly affects the cutting accuracy. The point-of-cut signal must have precise repeatability and stability, and the key point is to ensure that during high-speed operation, the angular position at which the cutter cuts off is accurately marked; the delay time of the signal output and the amount of error of the sensing position will be Causes control errors.
Selected considerations:
1) Operating voltage 24V.
2) Output signal voltage 24V.
3) The cutoff signal must be a pulsed signal.
4) The smaller the output delay, the better.
If the delay time is less than 3usec, the maximum possible error at the feed line speed of 100 m/min is:
100,000mm/60,000,000us*3us*2=0.01mm
5) The more accurate and better the repeatability of the sensing position.
6) The narrower the sensing angle, the better.
7) For higher accuracy, the Z-point signal of the encoder must be used in place of the normal proximity switch.
Shenzhen Wei Ke Da Technology Co., Ltd. feeds, the above basic components can achieve the most direct and economical control requirements of the Vec-VBR wheel cutting system produced by Vecoda.
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