1. A yoke unit comprising:
a first yoke with multiple first magnetic pole teeth;
a second yoke with multiple second magnetic pole teeth, each of the second magnetic pole teeth being arranged between two adjacent ones of the first magnetic pole teeth, the second yoke being coaxial with the first yoke; and
a resin section that makes the first and second yokes integral with each other, the resin section including a recessed part formed in an inner surface of the resin section, the recessed part being arranged between the first magnetic pole tooth and the second magnetic pole tooth.
2. The yoke unit according to claim 1, wherein
the first magnetic pole tooth has a V shape in a front view of the first magnetic pole tooth, and
the recessed part has a shape corresponding to the V shape.
3. The yoke unit according to claim 1, wherein the recessed part contacts the second magnetic pole tooth.
4. The yoke unit according to claim 1, wherein a distance between an outer surface of the resin section in an area where the recessed part is not formed and the center of the yoke unit is smaller than a distance between the outer surface of the resin section in an area where the recessed part is formed and the center of the yoke unit.
5. A method of manufacturing a yoke unit, the yoke unit comprising a first yoke with multiple first magnetic pole teeth, a second yoke with multiple second magnetic pole teeth, and a resin section that makes the first and second yokes integral with each other, the first and second yokes being coaxial with each other, each of the second magnetic pole teeth being arranged between the two adjacent ones of the first magnetic pole teeth, the method comprising:
a first step of fitting the first yoke to a lower mold to support the first and second yokes from respective inner surfaces of the first and second yokes;
a second step of fitting the second yoke to the lower mold; and
a third step of shaping the resin section, wherein
in the first step, the position of the first yoke in the circumferential direction relative to the lower mold is determined by making the first magnetic pole tooth contact a projecting part formed in the lower mold, and
in the second step, the position of the second yoke in the circumferential direction relative to the lower mold is determined by making the second magnetic pole tooth contact the projecting part.
6. A torque detector comprising the yoke unit as recited in claim 1.
7. (canceled)
8. A torque detector comprising the yoke unit manufactured by the method as recited in claim 5.
9. An electrically-driven power steering device comprising the torque detector as recited in claim 6.
10. An electrically-driven power steering device comprising the torque detector as recited in claim 8.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A lithium secondary battery, comprising:
a cathode active material including a lithium-containing transition metal oxide capable of performing reversible storage and release of lithium ions;
an anode active material including graphitized carbon capable of performing reversible storage and release of lithium ions;
a porous separator; and
a non-aqueous electrolyte containing (i) a lithium salt, (ii) an electrolyte solution and (iii) an ammonium compound.
2. The battery according to claim 1, wherein the ammonium compound is one or more organic ammonium compounds selected from compounds represented by Formula (I):
R1\u2014CO2\u2212(NH4)+
wherein R1 is optionally substituted alkyl or optionally substituted aryl.
3. The battery according to claim 1, wherein the ammonium compound is one or more halogenated ammonium compounds selected from compounds represented by Formula (II):
A\u2212(NH4)+
wherein A is a halogen atom.
4. The battery according to claim 2, wherein the organic ammonium compound is ammonium acetate or ammonium benzoate.
5. The battery according to claim 3, wherein the halogenated ammonium compound is ammonium chloride or ammonium iodide.
6. The battery according to claim 1, wherein the content of the ammonium compound is in the range of 0.01 to 10% by weight, based on the total weight of the electrolyte.
7. The battery according to claim 1, wherein the lithium-containing transition metal oxide is selected from the group consisting of LiCoO2, LiNiO2, LiMn2O4 and LiNi1-XCoXO2.
8. The battery according to claim 1, wherein the graphitized carbon has a distance constant between crystal faces of a carbonaceous material, doo2 value of less than 0.338 nm, as measured by X-ray diffraction, and a specific surface area of less than 10 m2g, as measured by a BET method.
9. The battery according to claim 1, wherein the lithium salt is selected from the group consisting of LiClO4, LiCF3SO3, LiC4F9SO3, LiPF6, LiBF4, LiAsF6, LiN(C2FsSO2)2 and LiN(CF3SO2)2.
10. The battery according to claim 1, wherein the electrolyte solution is at least one selected from the group consisting of ethylene carbonate (EC), propylene carbonate (PC), butylene carbonate (BC), vinylene carbonate (VC), diethyl carbonate (DEC), dimethyl carbonate (DMC), ethylmethyl carbonate (EMC), gamma-butyro lactone (GBL), sulfolane, methyl acetate (MA), ethyl acetate (EA), methyl propionate (MP) and ethyl propionate (EP).