motor control
The collector of each transistor is connected to a voltage source through a diode to protect the induced current on the motor winding from being burned when the transistor is not rotated. When the rotor rotates, an induced voltage appears on the windings of the motor. If the collector of the transistor is not connected to the voltage source through a diode, the current caused by the induced voltage will flow into the collector of the transistor.
Once the order of the hardware and digital outputs required to drive the motor is clear, we can write the software to the most convenient microcontroller or DSP to implement these sequences.
Firmware control
In addition to the two-phase motors discussed in this article, there are other types of stepper motors, such as three-phase stepper motors or four-phase stepper motors. There are also two-phase stepper motors that have only one center tap and are connected to the center point of the two windings. These stepper motors have five taps on the outside.
Similarly, stepper motors are not the only members of the motor family. The oldest and simplest motor is a direct current (DC) motor. Early DC motors used brushes, which are no longer popular. Today's common brushless DC motors are DC motors that use electronic circuits instead of brushes for commutation. There is no brush aging problem in such motors, so their life is much longer than brushed DC motors.
There is also an induction motor that works in a completely different way than a stepper motor or a DC motor. The DC motor uses a DC voltage source, while the induction motor uses an AC (AC) voltage source, and the rotation of the rotor and stator fields in the stepper motor and the DC motor is synchronized, while the rotor speed in the induction motor lags behind the stator field. Speed.
Summary of this article
This article gives a general introduction to stepper motors, and more details are waiting for your discovery. But as long as you understand the working principle of the motor described in this article, you can already start designing, maintaining and debugging the drive software and hardware of the stepper motor.
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