The control system is implemented using an extended microcontroller. Since each device has different growth layer, push boat length, push boat speed and push boat temperature threshold, it is necessary to equip the keyboard and display to input and display data and control the start and stop. Should be able to receive the temperature signal, and complete the corresponding conversion, the software will compare the received temperature value with the set value, when the match, start pushing the boat. The stepping motor and the ball screw are used to realize the precise positioning of the push boat, and the position and the dwell time of the push boat are controlled by controlling the number of pulses and the interval of the pulse. The software should have a simple monitoring program to manage the display and keyboard, convert and store the received data, and perform various conversions and comparisons. When the conditions are met, the converted stepping pulses are issued to achieve the predetermined control purpose. The system uses a single chip microcomputer. The stepper motor stepper motor has evenly distributed small teeth on the rotor, the angle between the teeth is degree, the stator has a large tooth, and the two large teeth of the phase difference form a phase.
Three-phase, each large tooth has several small teeth as on the rotor, and each phase of the stator has a field winding. The following describes the operation mode and characteristics of the stepper motor. Three-phase three-shot operation mode! When $ phase is energized. Different phases of electricity; the teeth on the phase stator are aligned with the teeth on the rotor. 0 After energization, under the action of the magnetic field, the motor rotates. The teeth on the phase stator advance the corresponding teeth on the rotor clockwise... The teeth on the phase stator advance the corresponding tooth on the rotor clockwise. When the phase is energized, the phase is not energized, the phase gear is aligned, and the motor is rotated.
When the three phases are energized in the order of $-.$, the stepping motor will continuously rotate in a clockwise direction. Each time the power is turned on, the gear is turned on every three times, so it is called three-phase three-shot, and each time the power is turned The fixed angle is called the step angle, and it is obvious that the step angle of the three-phase three-shot operation is degree. Assume that after a certain power-on, the control pulse no longer comes, and the motor rotor teeth stop rotating after being aligned with each other, which is called the positioning state. If the clockwise is called forward rotation, then when the power-on sequence is performed by $.-$, the motor rotates counterclockwise to reverse. It can be seen that controlling the forward rotation of the stepping motor is always different in the order in which the three-phase windings are energized. Three-phase six-shot operation mode When the $ phase is energized, the $phase stator teeth are aligned with the rotor teeth. Thereafter, if the $-two is energized at the same time, the degree of rotation can be found, and then the $ phase is turned off, and the phase is energized. The rotor can be rotated again, so follow $ to $-to-.
When the stepping motor is applied to the stepping motor, the motor rotates, and the step frequency is high, the motor rotates fast, the step frequency is low, and the motor rotates slowly. Changing the energization mode of each phase 0, that is, pulse distribution 1 can change the operation mode of the stepping motor. According to the three-phase six-shot system, the fine control of the stepping motor can be realized. #Change the power-on sequence to control the forward and reverse of the stepper motor. The interface technology of stepping motor and single chip microcomputer The connection between stepping motor and single chip microcomputer generally has two forms: the hardware circuit for distributing the pulse by hardware is composed of level adapter, pulse distributor and drive circuit. The single chip only provides step pulse and positive, Inversion signal, stepping motor movement and production stoppage, research on the automatic control of the displacement and time parameters of the push boat system under different temperature conditions, and put forward a total solution based on single-chip numerical control technology. .
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