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A unipolar motor has twice the amount of wire in the same space, but only half used at any point in time, hence is 50% efficient (or approximately 70% of the torque output available). Though a bipolar stepper motor is more complicated to drive, the abundance of driver chips means this is much less difficult to achieve.
The drivers can be paralleled for even higher current output. Even further, stacking one chip on top of another, both electrically and physically, has been done. Generally it can also be used for interfacing with a stepper motor, where the motor requires high ratings which cannot be provided by other interfacing devices. Main specifications:
Modern 'can' motor disassembled. The field uses two crescent-shaped permanent magnets and the motor case. The simple bipolar motor has been widely used in electric toys, since the early days of tinplate toys. The first such motors used a simple horseshoe permanent magnet. More modern 'can' motors, from the 1960s onwards, have remained bipolar ...
Apart from changing the rotation direction, the H-bridge can provide additional operation modes, "brake" and "free run until frictional stop". The H-bridge arrangement is generally used to reverse the polarity/direction of the motor, but can also be used to 'brake' the motor, where the motor comes to a sudden stop when the motor's terminals are ...
A unipolar motor (also called homopolar motor) is a direct current (DC) motor typically with slip-rings on each end of a cylindrical rotor and field magnets or a DC field winding generating a magnetic field on the stator. The rotor has typically not a winding but just straight connections in axial direction between the slip-rings (e.g. a copper ...
The switched reluctance motor (SRM) is a type of reluctance motor. Unlike brushed DC motors , power is delivered to windings in the stator (case) rather than the rotor . This simplifies mechanical design because power does not have to be delivered to the moving rotor, which eliminates the need for a commutator .
stepper motor An electric motor that moves its shafts in discrete steps as different poles are energized. stereophonic sound Sound reproduction systems intended to reproduce sound emanating from more than one direction. Stokes' theorem A theorem about integration of three-dimensional functions, much used in analysis of electric fields. storage tube
The pictures show a simplified version of a unipolar stepper motor, and unipolar steppers do not require changing polarity. Bipolar stepper motors are probably the more commonly used type, and they do need reverse polarity. The description in the article is a little vague; you may want to google for more description of the two types.