Eight-stator-pole, bipolar, 3.6-° hybrid step motor
AssigneeLin Engineering, Inc.
InventorTed T. Lin
Life of this patent
Estimating the term…
Abstract
A two-phase bipolar 3.6° step motor is described in which the stator winding assembly has eight stator poles organized into decoupled phase groups with two distinct angular pole separations, 14.4°×[(4n±1)/4] between poles of the same group, and 14.4°×[(4m±1)/2] between adjacent poles of different groups, where n and m are positive whole numbers. Three stator teeth on each stator pole have a stator tooth pitch of 13.2° to minimize detent torque for smoother, more accurate stepping. A rotor has alternating magnetic north and south rotor teeth around a circumference thereof with a 14.4° rotor tooth pitch angle. The stator poles are wound with electromagnetic coil windings that can be driven in a series of phases to magnetically interact with the rotor.
Claims13
A two-phase bipolar 3.6-degree step motor, comprising:
- a rotor having 25 magnetic north rotor teeth and 25 magnetic south rotor teeth arranged alternately around a circumference thereof with a 14.4° rotor pitch angle of magnetic north-south rotor teeth pairs, the rotor fitting within a stator winding assembly and seated by bearings on an axial shaft to rotate within a stator winding assembly;
- and
- the stator winding assembly having a stator with eight stator poles wound with electromagnetic coil windings that can be driven in a series of phases to magnetically interact with the rotor, the stator having three stator teeth per pole for a total of 24 stator teeth,
- wherein the eight stator poles are organized into four phase groups, center lines between pairs of poles of the same group being separated by 14.4°×[(4n±1)/4], center lines between poles of adjacent groups being separated by 14.4°×[(4m±1)/2] to decouple phases of adjacent phase groups, where n and m are positive whole numbers.
A two-phase bipolar 3.6-degree step motor, comprising:
- a rotor having 25 magnetic north rotor teeth and 25 magnetic south rotor teeth arranged alternately around a circumference thereof with a 14.4° rotor pitch angle of magnetic north-south rotor teeth pairs, the rotor fitting within a stator winding assembly and seated by bearings on an axial shaft to rotate within a stator winding assembly;
- and
- the stator winding assembly having a stator with eight stator poles wound with electromagnetic coil windings that can be driven in a series of phases to magnetically interact with the rotor, the stator having three stator teeth per pole for a total of 24 stator teeth, the three stator teeth on each stator pole having a stator tooth pitch of 13.2°;
- wherein the eight stator poles are organized into four phase groups, center lines between pairs of poles of the same phase group being separated by 39.6° and center lines between poles of adjacent phase groups being separated by 50.4° to decouple phases of adjacent phase groups, and
- wherein the eight stator poles are successively a pole a1 with a forward winding direction, a pole b1 with a reverse winding direction, a pole b2 with a forward winding direction, a pole a2− with a reverse winding direction, a pole a3 with a reverse winding direction, a pole b3 with a forward winding direction, a pole b4 with a reverse winding direction, and a pole a4− with a forward winding direction, the poles a1 and b1 forming a phase A group, the poles b2 and a2− forming a phase B group, the poles a3 and b3 forming a phase A− group, and the poles b4 and a4− forming a phase B− group, windings for each phase group being electrically connected.
Dependencies are inferred from the claim text.