Hybrid stepping motor, driving method for the same and coil winding method for the same
First Claim
1. A ten-phase hybrid stepping motor comprising:
- a rotor having rotor teeth, the rotor having an axial direction, a circumferential direction and a radial direction perpendicular to the axial direction, the rotor teeth including N pole teeth and S pole teeth alternatively arranged in the circumferential direction of the rotor at constant intervals, the rotor teeth having a rotor tooth pitch, the rotor tooth pitch being equal to a pitch between two adjacent N or S pole teeth;
a stator having Nos. 1-20 main poles, the main poles surrounding the rotor in circumferential direction of the rotor, each main pole extending toward the rotor in the radial direction of the rotor, each main pole having a free end and a center line in its extending direction, a stator tooth being formed at the free end of each main pole, the stator teeth facing the rotor teeth; and
a coil around each main pole for excitation of the main pole, whereby stepping motion of the rotor is realized upon excitation of the main poles, the magnitude of stepping pitch being obtained by dividing the rotor tooth pitch by ten,Nos. 1-10 main poles and Nos. 11-20 main poles facing each other in radial direction of the rotor respectively, an arbitrary main pole and a fifth next main pole having a 90-degree relation, andthe teeth on Nos. 1-10 main poles and those on Nos. 11-20 main poles respectively having positions determined by the following expression;
space="preserve" listing-type="equation">Pt×
k+m×
Θ
where Pt represents the rotor tooth pitch, Θ
represents the magnitude of the stepping pitch, m represents an integer between 0 and 9 but different from k;
k represents an arbitrary integer between 0 and K-1 and K represents a number of N pole teeth.
1 Assignment
0 Petitions
Accused Products
Abstract
A ten-phase and twenty-main pole hybrid stepping motor is driven by a five-phase driving pulse. The rotor has N and S pole tooth gears at ends of a rotor shaft. The stator has a cylindrical hollow body. Nos. 1-20 main poles extend from an inner wall of the hollow body toward the rotor shaft in a plane perpendicular to the rotor shaft so that the twenty main poles surround the N and S pole teeth in the plane perpendicular to the rotor shaft. Each main pole has a free end at which two stator teeth are formed. The stator teeth face the teeth of N and S pole teeth gears. A coil is wound around each main pole for excitation of the main pole. Nos. 1-10 main poles and Nos. 11-20 main poles face each other in the radial direction of the rotor respectively. An arbitrary main pole and a fifth next main pole always have a 90-degree relation. Positions of the teeth on Nos. 1-10 and Nos. 11-20 main poles are respectively determined by an expression with non-overlapping m being substituted:
Pt×k+m×θ
where Pt represents the rotor tooth pitch, θ represents the magnitude of the stepping pitch, m represents an arbitrary integer between 0 and 9, k represents an arbitrary integer between 0 and K-1 and K represents a number of N pole teeth.
-
Citations
29 Claims
-
1. A ten-phase hybrid stepping motor comprising:
-
a rotor having rotor teeth, the rotor having an axial direction, a circumferential direction and a radial direction perpendicular to the axial direction, the rotor teeth including N pole teeth and S pole teeth alternatively arranged in the circumferential direction of the rotor at constant intervals, the rotor teeth having a rotor tooth pitch, the rotor tooth pitch being equal to a pitch between two adjacent N or S pole teeth; a stator having Nos. 1-20 main poles, the main poles surrounding the rotor in circumferential direction of the rotor, each main pole extending toward the rotor in the radial direction of the rotor, each main pole having a free end and a center line in its extending direction, a stator tooth being formed at the free end of each main pole, the stator teeth facing the rotor teeth; and a coil around each main pole for excitation of the main pole, whereby stepping motion of the rotor is realized upon excitation of the main poles, the magnitude of stepping pitch being obtained by dividing the rotor tooth pitch by ten, Nos. 1-10 main poles and Nos. 11-20 main poles facing each other in radial direction of the rotor respectively, an arbitrary main pole and a fifth next main pole having a 90-degree relation, and the teeth on Nos. 1-10 main poles and those on Nos. 11-20 main poles respectively having positions determined by the following expression;
space="preserve" listing-type="equation">Pt×
k+m×
Θwhere Pt represents the rotor tooth pitch, Θ
represents the magnitude of the stepping pitch, m represents an integer between 0 and 9 but different from k;
k represents an arbitrary integer between 0 and K-1 and K represents a number of N pole teeth. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
-
-
16. A hybrid stepping motor comprising:
-
a rotor having rotor teeth, the rotor having an axial direction, a circumferential direction and a radial direction perpendicular to the axial direction, the rotor teeth including N pole teeth and S pole teeth alternatively arranged in the circumferential direction of the rotor at constant intervals, the rotor tooth having a rotor tooth pitch, the rotor tooth pitch being equal to a pitch between two adjacent N or S pole teeth; a stator having Nos. 1-20 main poles, the main poles surrounding the rotor in the circumferential direction of the rotor, each main pole extending toward the rotor in the radial direction of the rotor, each main pole having a free end, a stem portion and a center line in its extending direction, a stator tooth being formed at the free end of each main pole, the stator teeth facing the rotor teeth; and a coil around each main pole for excitation of the main pole, whereby stepping motion of the rotor is realized upon excitation of the main poles, a magnitude of stepping pitch being obtained by dividing the rotor tooth pitch by ten, Nos. 1-10 main poles and Nos. 11-20 main poles facing each other in the radial direction of the rotor respectively, an arbitrary main pole and a fifth next main pole having a 90-degree relation, the teeth on Nos. 1-10 main poles and those on Nos. 11-20 main poles respectively having positions determined by the following expression;
space="preserve" listing-type="equation">Pt×
k+m×
Θwhere Pt represents the rotor tooth pitch, Θ
represents the magnitude of the stepping pitch, m represents an integer between 0 and 9 but different from k, k represents an arbitrary integer between 0 and K-1 and K represents a number of N pole teeth,the stator tooth on an arbitrary main pole having a position determined by substituting k=an rounded integer as obtained by dividing K by 4 and m=5 into the expression Pt×
k+m×
Θ
as viewed from another stator tooth on a main pole 90 degrees away from the arbitrary main pole, anda coil around a certain main pole being wound in an opposite direction as a coil around a main pole 90 degrees away from the certain main pole. - View Dependent Claims (17, 18, 19, 20)
-
-
21. A ten-phase hybrid stepping motor comprising:
-
a rotor having rotor teeth, the rotor having an axial direction, a circumferential direction and a radial direction, the rotor teeth including N pole teeth and S pole teeth alternatively arranged in the circumferential direction of the rotor at constant intervals, the rotor tooth having a rotor tooth pitch and the rotor tooth pitch being equal to a pitch between two adjacent N or S pole teeth; a stator having Nos. 1-20 main poles, the main poles surrounding the rotor in the circumferential direction of the rotor, each main pole extending toward the rotor in the radial direction of the rotor, each main pole having a free end of each main pole, the stator teeth facing the rotor teeth; five input terminals; and
a coil around each main pole for excitation of the main pole, whereby stepping motion of the rotor is realized upon excitation of the main poles, the magnitude of stepping pitch being obtained by dividing the rotor tooth pitch by ten,Nos. 1-10 main poles and Nos. 11-20 main poles facing each other in the radial direction of the rotor respectively and an arbitrary main pole and a fifth next main pole are 90-degree relationship to each other, the teeth on Nos. 1-10 main poles and those on Nos. 11-20 main poles respectively having positions determined by an expression;
space="preserve" listing-type="equation">Pt×
k+m×
Θwhere Pt represents the rotor tooth pitch, Θ
represents the magnitude of the stepping pitch, m represents an integer between 0 and 9 but different from k, k represents an arbitrary integer between 0 and K-1 and K represents a number of N pole teeth,the stator tooth on an arbitrary main pole having a position determined by substituting k=-a rounded integer as obtained by dividing K by 4 and m=5 into the expression Pt×
k+m×
Θ
as viewed from another stator tooth on a main pole 90 degrees away from the arbitrary main pole,a coil around a certain main pole being wound in an opposite direction as a coil around a main pole 90 degrees away from the certain main pole, each four coils around four main poles being in 90-degree relationship to each other being connected in series to form five leads, each lead alternatively having normally and reversely wound coils, each lead having two ends to allow a current to flow from one end to the other end or vice versa, and at least one end of each lead being connected to one of the five input terminals. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29)
-
Specification