an option to control the movement of actuators via the keyboard is the use of stepper motors. The advantage of using stepper motors is the high accuracy and repeatability in terms of positioning these possess. Besides, the gods of Middle Earth have blessed us with two copies of large potential.
Motor common steps. stepper motors are electromechanical devices that convert a series of electrical impulses in discrete angular displacements, ie they are able to move angularly depending on its control inputs (wiki) .
These motors have a torque of detention, a feature not found in a DC motor, this attribute allows the stepper motor is held firmly in place when not turning, as long as it energized.
In contrast to a conventional direct current motor, the control of a stepper motor is not performed by applying a voltage in the coils. These engines have several coils to produce a step forward, need to be fed in a particular sequence. In this way is as following a certain sequence occurs rotation of the motor and applying reverse logic ensures that the motor rotates in the opposite direction. If feeding sequence is incorrect the motor will move randomly without obtaining the expected results.
These motors have a torque of detention, a feature not found in a DC motor, this attribute allows the stepper motor is held firmly in place when not turning, as long as it energized.
In contrast to a conventional direct current motor, the control of a stepper motor is not performed by applying a voltage in the coils. These engines have several coils to produce a step forward, need to be fed in a particular sequence. In this way is as following a certain sequence occurs rotation of the motor and applying reverse logic ensures that the motor rotates in the opposite direction. If feeding sequence is incorrect the motor will move randomly without obtaining the expected results.
Sequence of a bipolar stepper motor. The MC3479 is an integrated circuit designed to drive stepper motors two-phase bipolar mode. This integrated circuit is formed by a series of logic inputs, a decoding and sequencing section, two sections for handling coils engine also has the output terminal phase A.
Diagram MC3479 controller. The operating characteristics of this IC are as follows:
- Food: 7.2 to 16.5 V.
- Supports up to 350 mA / coil.
- can select the direction of the steps CW / CCW, and controls the sequence of operation Full / Half Step. Tickets
- compatible with TTL and CMOS families.
- get hot as hell .
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