Stepper motor and stepper motor driver, stepper motor is a kind of induction motor, its working principle is to use electronic circuits to convert direct current into time-sharing power supply, multi-phase timing control current, only when this kind of current is used to supply power to the stepping motor can the stepping motor work normally.
The stepping motor cannot be directly connected to the power supply to work, and a special stepping motor driver must be used.
The driver consists of pulse generation control unit, power drive unit, protection unit, etc.
The direct coupling between the drive unit and the stepping motor can also be understood as the power interface of the stepping motor microcomputer controller. How to realize drive control? As follows: feed pulse & rarr; Pulse hybrid circuit & rarr; Addition and subtraction pulse distribution circuit & rarr; Acceleration and deceleration Circuit & rarr; Ring distributor & rarr; Power amplifier & rarr;
To stepping motor winding 1. The pulse mixing circuit mixes pulse feed, manual return to Origin, error compensation, etc. into positive or negative pulse feed signals;
2. The addition and subtraction pulse distribution circuit combines the simultaneous positive or negative pulses into a single direction feed pulse;
3. The adjustment pulse of the acceleration and deceleration circuit is a pulse conforming to the acceleration and deceleration characteristics of the stepping motor, the frequency change should be stable, and the acceleration and deceleration has a certain time constant;
4. The ring distributor converts the passing pulse into a level signal that controls and controls the on and off of the stator winding of the stepping motor;
5. The mA-level current output by the ring distribution output of the power amplifier is amplified by power, which generally consists of a preamplifier and a power amplifier.
Stepping Motor products are widely used in vehicle-mounted electronic equipment, medical equipment, audio-visual equipment, information and communication equipment, household appliances, aviation models, electric tools, massage and health care equipment, electric toothbrushes, electric shaving planers, eyebrow shaping knives, hair dryer portable cameras, security equipment, precision instruments and electric toys and other electric products.
Although stepping motors have been widely used, stepping motors cannot be used under normal conditions like ordinary DC motors.
It must be composed of double ring pulse signal, power drive circuit and other control systems before use.
Therefore, it is not easy to use stepping motors well. It involves many professional knowledge such as machinery, motors, electronics and computers.
Related reading: Legend of Li Hongtao, inventor of brushless motor stepping motor, servo motor, rotating motor and its application TAG stepping motor driver