Introduction of closed-loop stepping motor operation control precision system
The closed-loop stepping motor operation control precision system is introduced. The closed-loop stepping motor is widely used in low-end industries due to its compact size, low price and stable operation. The stepping motor motion control realizes full closed loop, it used to be a big problem in the industrial control industry.
There are two main problems, the uncertainty of the origin and out-of-step. At present, high-speed photoelectric switch is adopted as the origin of stepping motor control system, and the error is in millimeter level, so in the field of precise control, it is unacceptable;
In addition, in order to improve the operation accuracy, the stepping motor system is driven by multiple subdivisions, some of which are greater than 16. If it is used in the reciprocating motion process, the error is amazing and cannot adapt to the processing field, closed-loop stepping motor full closed-loop control system came into being to meet the needs of the current motion control field.
Closed-loop stepping motor, with its precise control, shines brilliantly in the field of precise control and is widely used in many industries such as printing. Stepping Motor Technical Specifications: 1)Input and output corresponding frequency: ≤1 M; 2)Pulse synchronization time error: ≤10 ms; (
The main delay is in reverse correction, regardless of reverse correction, ≤10us); 3)Electrical accuracy of relocation: ≥2/encoder resolution ×4/motor resolution ×Subdivision); 4)Electrical accuracy of relocation origin ≥2/encoder resolution ×4/motor resolution ×Subdivision); 5)Adapt to PNP, NPN interface; 6)Adapt to servo pulse control; 7)
Adapt to various coding interfaces, stepping motor out-of-step control: adjust the output pulse in real time according to the feedback data of the encoder, and adopt corresponding measures according to the out-of-step adjustment degree.
Hardware connection of stepping motor: encoder is installed in the hardware connection. According to the subdivision requirements, different levels of resolution encoders are used for real-time feedback.
Step motor origin control: according to the Z signal of the encoder, identify and calculate the coordinate origin, which is the same as the numerical control system, and the accuracy can reach 2/encoder resolution ×4.
Principle description of stepping motor circuit: the Circuit adopts ultra-large scale circuit FPGA, and the input and output can reach the corresponding frequency of megabytes, and the power supply 3.
3 V, using 2596 switching power supply, convert 24V to 3.
3 V, convenient and practical, the input pulse and the feedback pulse are calculated after 4-frequency orthogonal decoding, and the output pulse quantity and frequency are corrected in time.
Application Description of stepping motor: this circuit has two modes, return to Origin mode and operation mode.
When the Origin enable switch is set, it enters the Origin mode, otherwise, it enters the operation mode.
In the Origin mode, the output pulse is synchronized with the frequency of the input pulse. When the Origin switch is touched, the output pulse frequency is reduced, and the coordinate origin is identified and calculated according to the Z signal of the encoder. After returning to the origin, output the signal.
This signal and its data are always maintained under the condition of continuous power supply.
In the operation mode, the pulse is output at the frequency synchronized with the input pulse, and the feedback data is calculated at the same time. If errors occur, correct them in time.
In addition, when the inertia is running, if the acceleration and deceleration settings are unreasonable, it may be corrected in time.
Ruite stepping motor motion control perfectly solves the above problems. Our stepping motor realizes full closed-loop control, which is no less than servo system, in particular, its low price, simple control and long service life are superior to servo systems in some occasions.
TAG closed loop stepper motor