Control circuit diagram for the steering and speed of the coiled motor
This circuit can be used to control the rotational speed and direction of a series of DC motors. The thyristors Q 1 -Q 4 are connected to a bridge, and each pair on the diagonal is triggered separately. Since the switch S1 is either connected to the coupling transformer T 1 or connected to the T 2 to a pulse circuit, which pair of thyristors are turned on is controlled by S 1 . By turning on Q 2 and Q 3 or Q 1 and Q 4 , the current in the field winding can be commutated. Since the direction of the turned current does not change, if the direction of the exciting current is changed relative to the direction of the rotor current, the direction of rotation of the motor is changed. A pulse circuit is used to drive the thyristor through the transformer T 1 or T 2 . The energy required to trigger the SCR from the capacitor C 1.
The retractable earphone is a type of earphone cable that can be freely retractable and free to control the earphone cable as needed. The principle of this earphone design is to inject liquid gallium indium alloy into the elastic polymer tube, which can be normally conductive and free to stretch. When you need to use it, take out the earphone cable and start using it. When you use it, you can retract it. After retracting, the overall volume is small, it is particularly convenient to carry, and there is no trouble with the winding of the earphone cable.
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