Hybrid-type stepping motor

Claim 2

An inner rotor hybrid type stepping motor, wherein a rotor includes two rotary plates having a multiplicity of gear-like salient poles, and includes a permanent magnet sandwiched between the rotary plates and magnetized in the same direction as a rotary shaft, the gear-like salient poles of the two rotary plates being disposed with a half pitch displaced relative to each other, and wherein m stator magnetic poles are disposed opposing a rotor surface with an air gap interposed therebetween and radially at equal pitches over 360 degrees, each of portions of the stator magnetic poles opposing the rotor has a plurality of teeth the same in number and having a pitch substantially equal to a rotor tooth pitch, and each main pole is wound with a winding, the improvement in which when the number of the gear-like salient poles of the rotor is represented by z, and n is an integer equal to or larger than 1 (n≧1), and magnetic polarities of adjacent stator magnetic poles are opposite polarities to each other by switching phase excitation, the following relationships are satisfied: m=9, and the stator is a 3-phase winding stator, it is set that z=9n±3.

Claim 3

An inner rotor hybrid type stepping motor, wherein a rotor includes two rotary plates having a multiplicity of gear-like salient poles, and includes a permanent magnet sandwiched between the rotary plates and magnetized in the same direction as a rotary shaft, the gear-like salient poles of the two rotary plates being disposed with a half pitch displaced relative to each other, and wherein m stator magnetic poles are disposed opposing a rotor surface with an air gap interposed therebetween and radially at equal pitches over 360 degrees, each of portions of the stator magnetic poles opposing the rotor has a plurality of teeth the same in number and having a pitch substantially equal to a rotor tooth pitch, and each main pole is wound with a winding, the improvement in which when the number of the gear-like salient poles of the rotor is represented by z, and n is an integer equal to or larger than 1 (n≧1), and magnetic polarities of adjacent stator magnetic poles are opposite polarities to each other by switching phase excitation, the following relationships are satisfied: m=12, and the stator is a 3-phase winding stator it is set that z=12n±4.

Claim 4

An inner rotor hybrid type stepping motor, wherein a rotor includes two rotary plates having a multiplicity of gear-like salient poles, and includes a permanent magnet sandwiched between the rotary plates and magnetized in the same direction as a rotary shaft, the gear-like salient poles of the two rotary plates being disposed with a half pitch displaced relative to each other, and wherein m stator magnetic poles are disposed opposing a rotor surface with an air gap interposed therebetween and radially at equal pitches over 360 degrees, each of portions of the stator magnetic poles opposing the rotor has a plurality of teeth the same in number and having a pitch substantially equal to a rotor tooth pitch, and each main pole is wound with a winding, the improvement in which when the number of the gear-like salient poles of the rotor is represented by z, and n is an integer equal to or larger than 1 (n≧1), and magnetic polarities of adjacent stator magnetic poles are opposite polarities to each other by switching phase excitation, the following relationships are satisfied: m=12, and the stator is a 3-phase winding stator it is set that z=12n±4.

Claim 5

An inner rotor hybrid type stepping motor, wherein a rotor includes two rotary plates having a multiplicity of gear-like salient poles, and includes a permanent magnet sandwiched between the rotary plates and magnetized in the same direction as a rotary shaft, the gear-like salient poles of the two rotary plates being disposed with a half pitch displaced relative to each other, and wherein m stator magnetic poles are disposed opposing a rotor surface with an air gap interposed therebetween and radially at equal pitches over 360 degrees, each of portions of the stator magnetic poles opposing the rotor has a plurality of teeth the same in number and having a pitch substantially equal to a rotor tooth pitch, and each main pole is wound with a winding, the improvement in which when the number of the gear-like salient poles of the rotor is represented by z, and n is an integer equal to or larger than 1 (n≧1), and magnetic polarities of adjacent stator magnetic poles are opposite polarities to each other by switching phase excitation, the following relationships are satisfied: m=8, and the stator is a 4-phase winding stator it is set that z=8n±3.

Claim 6

An inner rotor hybrid type stepping motor, wherein a rotor includes two rotary plates having a multiplicity of gear-like salient poles, and includes a permanent magnet sandwiched between the rotary plates and magnetized in the same direction as a rotary shaft, the gear-like salient poles of the two rotary plates being disposed with a half pitch displaced relative to each other, and wherein m stator magnetic poles are disposed opposing a rotor surface with an air gap interposed therebetween and radially at equal pitches over 360 degrees, each of portions of the stator magnetic poles opposing the rotor has a plurality of teeth the same in number and having a pitch substantially equal to a rotor tooth pitch, and each main pole is wound with a winding, the improvement in which when the number of the gear-like salient poles of the rotor is represented by z, and n is an integer equal to or larger than 1 (n≧1), and magnetic polarities of adjacent stator magnetic poles are opposite polarities to each other by switching phase excitation, the following relationships are satisfied: m=8, and the stator is a 4-phase winding stator it is set that z=8n±3.

Claim 7

An inner rotor hybrid type stepping motor, wherein a rotor includes two rotary plates having a multiplicity of gear-like salient poles, and includes a permanent magnet sandwiched between the rotary plates and magnetized in the same direction as a rotary shaft, the gear-like salient poles of the two rotary plates being disposed with a half pitch displaced relative to each other, and wherein m stator magnetic poles are disposed opposing a rotor surface with an air gap interposed therebetween and radially at equal pitches over 360 degrees, each of portions of the stator magnetic poles opposing the rotor has a plurality of teeth the same in number and having a pitch substantially equal to a rotor tooth pitch, and each main pole is wound with a winding, the improvement in which when the number of the gear-like salient poles of the rotor is represented by z, and n is an integer equal to or larger than 1 (n≧1), and magnetic polarities of adjacent stator magnetic poles are opposite polarities to each other by switching phase excitation, the following relationships are satisfied: m=16, and the stator is a 4-phase winding stator it is set that z=16n±6.

Claim 8

An inner rotor hybrid type stepping motor, wherein a rotor includes two rotary plates having a multiplicity of gear-like salient poles, and includes a permanent magnet sandwiched between the rotary plates and magnetized in the same direction as a rotary shaft, the gear-like salient poles of the two rotary plates being disposed with a half pitch displaced relative to each other, and wherein m stator magnetic poles are disposed opposing a rotor surface with an air gap interposed therebetween and radially at equal pitches over 360 degrees, each of portions of the stator magnetic poles opposing the rotor has a plurality of teeth the same in number and having a pitch substantially equal to a rotor tooth pitch, and each main pole is wound with a winding, the improvement in which when the number of the gear-like salient poles of the rotor is represented by z, and n is an integer equal to or larger than 1 (n≧1), and magnetic polarities of adjacent stator magnetic poles are opposite polarities to each other by switching phase excitation, the following relationships are satisfied: m=16, and the stator is a 4-phase winding stator it is set that z=16n±6.

Claim 9

An outer rotor hybrid type stepping motor, wherein a rotor includes two rotary plates having a multiplicity of gear-like salient poles, and includes a permanent magnet sandwiched between the rotary plates and magnetized in the same direction as a rotary shaft, the gear-like salient poles of the two rotary plates being disposed with a half pitch displaced relative to each other, and wherein m stator magnetic poles are disposed opposing a rotor surface with an air gap interposed therebetween and radially at equal pitches over 360 degrees, each of portions of the stator magnetic poles opposing the rotor has a plurality of teeth the same in number and having a pitch substantially equal to a rotor tooth pitch, and each main pole is wound with a winding, the improvement in which when the number of the gear-like salient poles of the rotor is represented by z, and n is an integer equal to or larger than 1 (n≧1), and magnetic polarities of adjacent stator magnetic poles are opposite polarities to each other by switching phase excitation, the following relationships are satisfied: m=9, and the stator is a 3-phase winding stator, it is set that z=9n±3.

Claim 10

An outer rotor hybrid type stepping motor, wherein a rotor includes two rotary plates having a multiplicity of gear-like salient poles, and includes a permanent magnet sandwiched between the rotary plates and magnetized in the same direction as a rotary shaft, the gear-like salient poles of the two rotary plates being disposed with a half pitch displaced relative to each other, and wherein m stator magnetic poles are disposed opposing a rotor surface with an air gap interposed therebetween and radially at equal pitches over 360 degrees, each of portions of the stator magnetic poles opposing the rotor has a plurality of teeth the same in number and having a pitch substantially equal to a rotor tooth pitch, and each main pole is wound with a winding, the improvement in which when the number of the gear-like salient poles of the rotor is represented by z, and n is an integer equal to or larger than 1 (n≧1), and magnetic polarities of adjacent stator magnetic poles are opposite polarities to each other by switching phase excitation, the following relationships are satisfied: m=9, and the stator is a 3-phase winding stator, it is set that z=9n±3.

Claim 11

An outer rotor hybrid type stepping motor, wherein a rotor includes two rotary plates having a multiplicity of gear-like salient poles, and includes a permanent magnet sandwiched between the rotary plates and magnetized in the same direction as a rotary shaft, the gear-like salient poles of the two rotary plates being disposed with a half pitch displaced relative to each other, and wherein m stator magnetic poles are disposed opposing a rotor surface with an air gap interposed therebetween and radially at equal pitches over 360 degrees, each of portions of the stator magnetic poles opposing the rotor has a plurality of teeth the same in number and having a pitch substantially equal to a rotor tooth pitch, and each main pole is wound with a winding, the improvement in which when the number of the gear-like salient poles of the rotor is represented by z, and n is an integer equal to or larger than 1 (n≧1), and magnetic polarities of adjacent stator magnetic poles are opposite polarities to each other by switching phase excitation, the following relationships are satisfied: m=12, and the stator is a 3-phase winding stator it is set that z=12n±4.

Claim 12

An outer rotor hybrid type stepping motor, wherein a rotor includes two rotary plates having a multiplicity of gear-like salient poles, and includes a permanent magnet sandwiched between the rotary plates and magnetized in the same direction as a rotary shaft, the gear-like salient poles of the two rotary plates being disposed with a half pitch displaced relative to each other, and wherein m stator magnetic poles are disposed opposing a rotor surface with an air gap interposed therebetween and radially at equal pitches over 360 degrees, each of portions of the stator magnetic poles opposing the rotor has a plurality of teeth the same in number and having a pitch substantially equal to a rotor tooth pitch, and each main pole is wound with a winding, the improvement in which when the number of the gear-like salient poles of the rotor is represented by z, and n is an integer equal to or larger than 1 (n≧1), and magnetic polarities of adjacent stator magnetic poles are opposite polarities to each other by switching phase excitation, the following relationships are satisfied: m=12, and the stator is a 3-phase winding stator it is set that z=12n±4.

Claim 13

An outer rotor hybrid type stepping motor, wherein a rotor includes two rotary plates having a multiplicity of gear-like salient poles, and includes a permanent magnet sandwiched between the rotary plates and magnetized in the same direction as a rotary shaft, the gear-like salient poles of the two rotary plates being disposed with a half pitch displaced relative to each other, and wherein m stator magnetic poles are disposed opposing a rotor surface with an air gap interposed therebetween and radially at equal pitches over 360 degrees, each of portions of the stator magnetic poles opposing the rotor has a plurality of teeth the same in number and having a pitch substantially equal to a rotor tooth pitch, and each main pole is wound with a winding, the improvement in which when the number of the gear-like salient poles of the rotor is represented by z, and n is an integer equal to or larger than 1 (n≧1), and magnetic polarities of adjacent stator magnetic poles are opposite polarities to each other by switching phase excitation, the following relationships are satisfied: m=8, and the stator is a 4-phase winding stator it is set that z=8n±3.

Claim 14

An outer rotor hybrid type stepping motor, wherein a rotor includes two rotary plates having a multiplicity of gear-like salient poles, and includes a permanent magnet sandwiched between the rotary plates and magnetized in the same direction as a rotary shaft, the gear-like salient poles of the two rotary plates being disposed with a half pitch displaced relative to each other, and wherein m stator magnetic poles are disposed opposing a rotor surface with an air gap interposed therebetween and radially at equal pitches over 360 degrees, each of portions of the stator magnetic poles opposing the rotor has a plurality of teeth the same in number and having a pitch substantially equal to a rotor tooth pitch, and each main pole is wound with a winding, the improvement in which when the number of the gear-like salient poles of the rotor is represented by z, and n is an integer equal to or larger than 1 (n≧1), and magnetic polarities of adjacent stator magnetic poles are opposite polarities to each other by switching phase excitation, the following relationships are satisfied: m=8, and the stator is a 4-phase winding stator it is set that z=8n±3.

Claim 15

An outer rotor hybrid type stepping motor, wherein a rotor includes two rotary plates having a multiplicity of gear-like salient poles, and includes a permanent magnet sandwiched between the rotary plates and magnetized in the same direction as a rotary shaft, the gear-like salient poles of the two rotary plates being disposed with a half pitch displaced relative to each other, and wherein m stator magnetic poles are disposed opposing a rotor surface with an air gap interposed therebetween and radially at equal pitches over 360 degrees, each of portions of the stator magnetic poles opposing the rotor has a plurality of teeth the same in number and having a pitch substantially equal to a rotor tooth pitch, and each main pole is wound with a winding, the improvement in which when the number of the gear-like salient poles of the rotor is represented by z, and n is an integer equal to or larger than 1 (n≧1), and magnetic polarities of adjacent stator magnetic poles are opposite polarities to each other by switching phase excitation, the following relationships are satisfied: m=16, and the stator is a 4-phase winding stator it is set that z=16n±6.

Claim 16

An outer rotor hybrid type stepping motor, wherein a rotor includes two rotary plates having a multiplicity of gear-like salient poles, and includes a permanent magnet sandwiched between the rotary plates and magnetized in the same direction as a rotary shaft, the gear-like salient poles of the two rotary plates being disposed with a half pitch displaced relative to each other, and wherein m stator magnetic poles are disposed opposing a rotor surface with an air gap interposed therebetween and radially at equal pitches over 360 degrees, each of portions of the stator magnetic poles opposing the rotor has a plurality of teeth the same in number and having a pitch substantially equal to a rotor tooth pitch, and each main pole is wound with a winding, the improvement in which when the number of the gear-like salient poles of the rotor is represented by z, and n is an integer equal to or larger than 1 (n≧1), and magnetic polarities of adjacent stator magnetic poles are opposite polarities to each other by switching phase excitation, the following relationships are satisfied: m=16, and the stator is a 4-phase winding stator it is set that z=16n±6.