Winding for operation of a three-phase stepping motor from a two-phase drive

A three-phase stepping motor adapted to be driven from a two-phase drive, comprising:

• (a) a moving member magnetically interacting with a stationary member;
• (b) the stationary member having n total poles, where n/6=an integer, comprising first, second, and third sets of equal numbers of poles having thereon coils for magnetic energization thereof;
• (c) the first and second sets having 2n/3 poles each;
• (d) the third set having n/3 poles;
• (e) the poles of the first and second sets each having a single coil thereon;
• (f) the poles of the third set each having two coils thereon;
• (g) the coils on the first set of poles and one of the coils on each pole of the third set of poles being connected to one phase of the drive;
• and
• (h) the coils on the second set of poles and the other of the coils on each pole of the third set of poles being connected to the other phase of the drive.

A three-phase stepping motor adapted to be driven by a two-phase drive, comprising:

• (a) a moving member magnetically interacting with a stationary member;
• (b) the stationary member having first through n.sup.th poles having thereon coils for magnetic energization thereof;
• (c) the first, third, fourth, sixth, seventh, ninth, tenth, . . . and n.sup.th poles each having a single coil thereon;
• (d) the second, fifth, eighth, eleventh, . . . and (n.sup.th -1) poles each having two coils thereon;
• (e) the first, second, third, seventh, eighth, ninth, . . . and (n.sup.th -3) poles having the coils thereon wound in one direction;
• (f) the fourth, fifth, sixth, tenth, eleventh, twelfth, . . . and n.sup.th poles having the coils thereon wound in the opposite direction;
• (g) the coil on the first pole, one of the coils on the second pole, the coil on the fourth pole, one of the coils on the fifth pole, the coil on the seventh pole, one of the coils on the eighth pole, the coil on the tenth pole, and one of the coils on the eleventh pole, . . . and one of the coils on the (n.sup.th -1) pole being connected to one phase of the drive;
• and
• (h) the other of the coils on the second pole, the coil on the third pole, the other of the coils on the fifth pole, the coil on the sixth pole, the other of the coils on the eighth pole, the coil on the ninth pole, the other of the coils on the eleventh pole, the coil on the twelfth pole, . . . and the coil on the n.sup.th pole being connected to the other phase of the drive.

A rotary, three-phase stepping motor adapted to be driven from a two-phase drive, comprising:

• (a) a cylindrical rotor having longitudinal, equidistantly-spaced teeth around the periphery thereof;
• (b) a stator having toothed poles radially disposed about the rotor, such that the teeth of the rotor and the teeth of the stator poles may magnetically interact to cause rotation of the rotor upon energization of the stator poles;
• (c) the stator poles comprising first, second, and third sets of equal numbers of poles having thereon coils for magnetic energization thereof;
• (d) the poles of the first and second sets each having a single coil thereon;
• (e) the poles of the third set each having two coils thereon;
• (f) the coils on the first set of poles and one of the coils on each pole of the third set of poles being connected to one phase of the drive;
• and
• (g) the coils on the second set of poles and the other of the coils on each pole of the third set of poles being serially connected to the other phase of the drive.