High speed stepping motor with mechanical commutator

Claim 2

A high speed stepping motor comprising: a stator having a bore and a plurality of salient poles on which stator windings are wound; a rotor having a plurality of axial teeth and slots positioned alternatively on a peripheral surface thereof; a plurality of rotor windings respectively mounted in said slots of said rotor; a commutator mounted on a shaft of said rotor and having segments respectively connected to said rotor windings; brushes for making contact with said commutator segments to enable electric energy to be supplied to said rotor windings; and, means for changing the direction of energization of saId stator windings to thereby change the direction of the magnetic field resulting therefrom and for synchronously changing the direction of energization of said rotor windings, so that the said rotor may be stepwise rotated, wherein said rotor and stator windings are separately energized, and; wherein said means for synchronously changing the direction of energization of said stator windings and said rotor windings includes a command counter for generating pulses for a given count; a detector for detecting the last count of said predetermined count; and gating means responsive to a last count detection by said detector for causing said synchronous change in the direction of energization to occur whereby said stepping motor can be continuously run at a high speed up until said last count is detected.

Claim 3

A high speed stepping motor comprising: a stator having a bore and a plurality of salient poles on which stator windings are wound; a rotor having a plurality of axial teeth and slots positioned alternatively on a peripheral surface thereof; a plurality of rotor windings respectively mounted in said slots of said rotor; a commutator mounted on a shaft of said rotor and having segments respectively connected to said rotor windings; brushes for making contact with said commutator segments to enable electric energy to be supplied to said rotor windings; and, means for changing the direction of energization of said stator windings to thereby change the direction of the magnetic field resulting therefrom and for synchronously changing the direction of energization of said rotor windings, wherein said means for synchronously changing the direction of energization of said stator windings and said rotor windings includes a command counter for generating pulses of a first polarity for a given count and for generating pulses of a second polarity after said given count is reached; and, switching means for generating a first output when said command counter generates said first polarity pulses to provide a torque for rotating said rotor in a first direction and for generating a second output when said command counter generates said second polarity pulses to provide a damping torque to rotate said rotor in a second and reverse direction.

Claim 4

A high speed stepping motor comprising: a stator having a bore and a plurality of salient poles on which stator windings are wound; a rotor having a plurality of axial teeth and slots positioned alternatively on a peripheral surface thereof; a plurality of rotor windings respectively mounted in said slots of said rotor; a commutator mounted on a shaft of said rotor and having segments respectively connected to said rotor windings; brushes for making contact with said commutator segments to enable electric energy to be supplied to said rotor windings; and, means for changing the direction of energization of said stator windings to thereby change the direction of the magnetic field resulting therefrom and for synchronously changing the direction of energization of said rotor windings, wherein said means for synchronously changing the direction of energization of said stator windings and said rotor windings includes a command counter for generating pulses of a first polarity for a given count and for generating pulses of a second polarity after said given count is reached; and, switching means for generating a first output when said command counter generates said first polarity pulses to provide a torque for rotating said rotor in a first direction and for generating a second output when said command counter generates said second polarity pulses to provide a damping torque to rotate said rotor in a second and reverse direction.

Claim 5

A high speed stepping motor as in claim 2, wherein said rotor windings connected to said commutator segments are connected only to one end of said rotor windings, the other ends of said rotor windings being oppositely connected to each other.

Claim 6

A high speed stepping motor as in claim 2, wherein said switching means is a flip-flop.

Claim 7

A high speed stepping motor as in claim 2, wherein said means for synchronously changing the direction of energization of said stator windings and said rotor windings further includes: a variable frequency pulse generator; an AND gate having an output from said pulse generator and from said command counter as inputs thereto; a flip-flop having a clock input and a first and a second output; an output of said AND gate being applied to the clock input of said flip-flop and to an input of said command counter; a first mono-multivibrator and a second mono-multivibrator; gating means, said first and said second outputs of said flip-flop being respectively connected to said first and said second mono-multivibrators and to said gating means; a first and a second switching circuit to which an output of said first and said second mono-multivibrators is each directly and indirectly connected; and, a third and a fourth switching circuit to which outputs of said gating means are connected.

Claim 8

A high speed stepping motor as in claim 5, wherein said gating means includes a first, a second, a third, and a fourth AND gate.