Single-phase stepper motor

Single-phase stepper motor is a coil winding circular coil skeleton, give it to the application of alternating current, each switch current is fixed direction step at a time. Due to the rotor of the magnetic circuit of magnetic conductance (through whichThe reciprocal of magnetic resistance, says magnetic flux through the easy degree)Change greatly the direction of rotation, so the single-phase stepper motor can only in one direction. In order to make sure rotation, magnetic guide adopted various measures, such as the stator poles on the rotor, wide work uneven air gap between the stator and rotor, the rotation direction is the direction of the magnetic resistance is small. Figure 2. 2 (a)Stator winding is current, N and S pole stator poles, the rotor's N and S extremely attracted to the stator poles, parked in this position. When the stator current by is becoming negative, in the process of switch, current is close to zero, the attraction of the stator to the rotor is close to zero, the rotor flux of the torque is given priority to, as shown in figure 2. 2 (b), as is shown in the rotor flux to walk the path of least air gap, so the rotor flux under the action of torque, to the axis of the rotor poles (moving along the direction of arrowN and S pole center line)Stop is minimal air gap. When the stator winding is negative current, as shown in figure 2. 2 (c), as is shown in the polarity reversal of the stator poles, the rotor pole by the repulsive force and the gravity of the stator N and S pole, along the arrow direction, until the centre axis stator poles rotor stop moving. Again adds on the winding current changes of direction change from negative to positive, the current variable is zero, the rotor through the figure 2. 2 (d)Figure 2. 2 (a)Step, from the Angle of 1800. The above action repeated, motor rotor will continue to roll. See from the above operation principle of single-phase stepper motor, single-phase stepper motor electromagnetic torque in the stator current only generated when the transform, so the average torque motor is much smaller than above two phase, under light load operation of the response rate is low. Such as clock, automotive timer (Engine timers), water meter counter etc.
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