Three stepper-motor drive formats, wave-drive one-phase , two-phase, and halfstep are externally selectable. This excitation mode consumes the least power and assures positional accuracy regardless of any winding inbalance in the motor. This sequence mode offers an improved torque-speed product, greater detent torque, and is less susceptible to motor resonance. The bipolar outputs are capable of sinking up to 1. Ground-clamp and flyback diodes provide protection against inductive transients. Thermal protection circuitry disables the outputs when the chip temperature is excessive.
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Innovation is the only way to win The primary negative aspect of mechanical control was that reliability was in contrast to the maintenance costs associated with keeping these panels operating which were extremely high. A second major factor was the time, expense and labor required when a change in control needs dedicated a control panel modification.
Depending on application, changing the speed of motor using hardwired control is tedious because hardwired control involves both manual and mechanical operation i. To overcome the drawbacks of hardwired control several modern techniques had been developed. Among them a very easiest technique to control the stepper motor speed control by using UCNB translator. With this technique almost endless variety of motion systems can be controlled.
Owing easy understandable and more efficient and performance. We have done project on speed Control. This project allows you to control the speed, direction, and step size of a unipolar four phase stepper motor.
The controller is capable of handling motor winding currents of up to 1. A unique feature of this project is that the circuit can operate in either remote mode or stand-alone mode. In the stand-alone mode, an on-board pulse generator and a four-position DIP switch allows you to demonstrate all of the functions without any additional connections.
This mode is perfect for demonstrating basic stepper motor control principles. The circuit even has LEDs that show the energized phases for each step. In remote mode, all motor functions can be interfaced to external logic or a microcontroller. This allows the controller to be incorporated into a robot, an X-Y plotter, or any motion control project.
The voltage can be anything from 6 to 30 volts, depending upon the rating of the stepper motor. These resistors limit the current to the motor and allow the motor to be operated with a power supply voltage greater than the voltage rating of the motor for improved performance.
Stable voltage for the rest of the circuit is obtained by regulating the input voltage down to 5V with U4, a LM78L05 voltage regulator IC. Capacitors C7, C1, and C5 provide additional voltage filtering. U1 is capable of supplying up to am of current. It contains a CMOS logic section for these quenching logic and a high voltage bipolar output section to directly drive a unipolar stepper motor. Resistor R3 provides current limiting to the LEDs. Pins 9, 10, 14, and 15 of U1 are control inputs for phase, half step, direction, and output-enable.
These signals are pulled-down to a logic LOW level by resistors R Switches allow for manual control of each function, or alternatively, connector P3 allows the functions to be controlled by external logic or a microcontroller chip. The UCNB requires an external pulse input on pin 11 to advance the stepper motor.
This signal can be supplied by external logic via connector P3 or can be provided byU2 or U3. U2 is configured as an astable oscillator that delivers continuous pulses. The pulse rate is controlled by potentiometer R13 and capacitor C2. U3 is configured in a monostable mode to produce a single pulse when S5 is pressed.
Jumper J1 selects between the single-step or continuous mode. No comments :.
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