Variable reluctance resolver and rotation angle detecting device

摘要

Two excitation coils (excitation A coil, excitation B coil) and two detection coils (detection A coil, detection B coil) are provided. The excitation A coil and the excitation B coil are excited at frequencies that are different from each other. The number of turns of the detection A coil and the detection B coil are respectively set with two sine waves using the number ms1 and ms2 of pole pairs. The number ms1 and ms2 of pole pairs, the number mx1 and mx2 of pole pairs of the excitation A coil and the excitation B coil, and the number mr of pole pairs of a rotor are set to have a predetermined relationship. A resolver having redundancy can be realized with small number of coils.

主权项

1. A variable reluctance resolver, comprising:
two excitation coils; and two detection coils; wherein the two excitation coils are excited by frequencies that are different from each other, when the number of teeth is set to be n and a tooth number is set to be i, i being 1, 2, . . . , n, the number Nx1i of turns and the number Nx2i of turns of the two excitation coils and the number Ns1i of turns and the number Ns2i of turns of the two detection coils with respect to each tooth of a stator are expressed as
Nx1i=Nxmax·rx1·cos(mx1Ψi+θx1)Nx2i=Nxmax·rx2·cos(mx2Ψi+θx2)Ns1i=Nsmax·{rs1·cos(ms1Ψi+θs1)+rs2·cos(ms2Ψi+θs2)}Ns2i=Nsmax·{rs1·sin(ms1Ψi+θs1)+rs2·sin(ms2Ψi+θs2)}, in which, Nxmax: maximum number of turns of the excitation coils, Nsmax: maximum number of turns of the detection coils, mx1, mx2: number of pole pairs of the excitation coils, ms1, ms2: number of pole pairs of the detection coils, θx1, θx2: phase of the excitation coils, θs1, θs2: phase of the detection coils, rx1, rx2: coefficient of the excitation coils, rs1, rs2: coefficient of the detection coils, and Ψi: teeth angleare set, and
mx1, mx2, ms1, ms2, and the number mr of pole pairs of a rotor are set to satisfy one condition among a total of eight conditions of mx1±ms1=±mr and mx1±ms2=±mr, and further satisfy one condition among a total of eight conditions of mx2±ms1=±mr and mx2±ms2=±mr.