A: The current meter has no reaction when the power button is pressed. Most of this situation occurs when the power-on loop is not normal.
The main reasons are:
(1) The battery contact is damaged so that the power cannot be sent to the power supply integrated circuit;
(2) Poor contact of the power button;
(3) The power-on key to the power supply integrated circuit triggers the circuit between the feet to have a virtual soldering scene;
(4) The power supply integrated circuit is damaged;
The unipolar Stepper Motor operates with one winding with a center tap per phase. Each section of the winding is switched on for each direction of the magnetic field. Each winding is made relatively simple with the commutation circuit, this is done since the arrangement has a magnetic pole which can be reversed without switching the direction of the current. In most cases, given a phase, the common center tap for each winding is the following; three leads per phase and six leads for a regular two-phase stepper motor.
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