Rotation angle sensor system and semiconductor device

A semiconductor device for processing a detection signal from a rotation angle sensor which includes a shaft angle multiplier of 2, a rotor having a first pole and a second pole and stator having a plurality of salient poles wound by detection coils, respectively, the semiconductor device comprising:

• a synthesis circuit configured to synthesize detection signals from the detection coils to generate a first synthesized detection signal and a second synthesized detection signal, and
• a conversion circuit configured to generate a detection clock signal based on the first and the second synthesized detection signal,
• wherein the first and the second synthesized detection signal are generated based on the detection signals from the detection coils wound on the salient poles which are installed at different electrical angles based on the first and the second pole, respectively,
• wherein the synthesis circuit includes a first adder and a second adder,
• wherein, when the synthesis circuit includes a plurality of amplifiers which amplify the detection signals from the detection coils at an individually set amplification factor, i) the first adder adds part of each output signal from the plurality of amplifiers to generate the first synthesized detection signal and ii) the second adder adds the other part of each output signal from the plurality of amplifiers to generate the second synthesized detection signal, and
• wherein, when the synthesis circuit includes 1) a plurality of variable amplifiers whose amplification factors can be individually set variably and 2) a selection circuit which transmits part of each output signal from the plurality of variable amplifiers to the first adder, and transmits the other part of each output signal from the plurality of variable amplifiers to the second adder according to a selection signal, i) the first adder adds part of each output signal from the selection circuit to generate the first synthesized detection signal and ii) the second adder adds the other part of each output signal from the selection circuit to generate the second synthesized detection signal.

A rotation angle sensor system comprising:

• a rotation angle sensor including 1) a rotor having a first pole and a second pole and 2) a stator having a plurality of salient poles wound by detection coils, respectively;
• and
• a synthesis circuit configured to generate a first synthesized detection signal and a second synthesized detection signal based on detection signals from at least two of the detection coils, respectively,
• wherein the salient poles are installed at different electrical angles based on the first pole and the second pole, respectively,
• wherein the rotation angle sensor comprises shaft angle multiplier of 3,
• wherein the stator includes:
• a first salient pole;
• a second salient pole installed at a position apart by 140° in a mechanical angle based on the first salient pole;
• a third salient pole installed at a position apart by 140° in the mechanical angle based on the second salient pole;
• a fourth salient pole installed at a position apart by 30° in the mechanical angle based on the first salient pole;
• a fifth salient pole installed at a position apart by 140° in the mechanical angle based on the fourth salient pole;
• and
• a sixth salient pole installed at a position apart by 140° in the mechanical angle based on the fifth salient pole, and
• wherein the synthesis circuit synthesizes detection signals from the detection coils respectively wound around the first salient pole, the second salient pole and the third salient pole to generate one of the first synthesized detection signal and the second synthesized detection signal, and synthesizes detection signals from the detection coils respectively wound around the fourth salient pole, the fifth salient pole and the sixth salient pole to generate the other one of the first synthesized detection signal and the second synthesized detection signal.