the direction of rotation of the two-phase stepper motor power

14 simple ways to adjust the direction of rotation of the two-phase stepper motor power?
However, since the current becomes weak, the brightness of a portable  cell phone jammer  may decrease, though it is not very obvious.  Just the motor drive wiring of A + and A-(or B + and B-) can be reversed. The main features of the stepper motor: stepper motor of the main features: a stepper motor drive must be added before they can operate, drive models must be a pulse signal, the pulse, the stepper motor at rest, if you add the appropriate pulse signal, it to a certain angle (called the step angle) rotation. Rotation speed and the frequency is proportional to the pulse. Tamron version of the stepper motor step angle of 7.5 degrees, 360 degrees of a circle,  Stepper motor output torque increases with the speed constant attenuation, output power increases with the speed changes to maintain torque has become a balance of 40The amount of stepper motor one of the most important parameters. For example, when people say 2N.m stepper motor, in case of no special note refers to the holding torque of 2N.m stepper motor.  When a transmitter of a portable  cell phone jammer  is matching an address code, it can receive code and store it in its memorizer.   DETENT TORQUE: refers to the stepper motor is not energized, the stator locked rotor torque. DETENT TORQUE there is no uniform mode of translation in the country, is easy to misunderstand;
The stepper motor of the most widely used.
 when the rotor and the stator stagger angle to produce the force F (dФ / dθ) is proportional to S flux Ф = Br * S of Br flux density, S is the magnetic area of the F and L * D * Br is proportional to L for the core effective length, D is rotor diameter of Br = N ? I / the RN ? I is the excitation winding ampere turns (current multiplied by the number of turns) R is the magnetic resistance. Torque = force * radius of the torque motor effective volume of the * Ann turns * flux density is proportional to (only consider the linear state), the motor effective volume the greater the greater the excitation ampere turns.
 motor drive hardware structure of the motor drive circuit as below: in which the resistance value of R1-R8, 320. R9-R12 resistor value of 2.2K. Q1-Q4 Darlington D401A, Q5-Q8 for the S8550. J1, J2 and six-lead stepper motor connected to the difference between servo motor and stepper motor stepper motor is a discrete movement of the device is intrinsically linked to it,  There may be no response when you switch on a portable  cell phone jammer  if its power is off.  and modern digital control technology. The stepper motor is widely used in the digital control system.