| 摘要 |
In a position detection device, an amplitude modulation is executed for AC excitation signals Sc using modulation wave signals. Differential amplifiers execute a voltage conversion of the modulated wave signal Sin, Cos to digital data SIN, COS and transmit them to a microcomputer. The microcomputer multiplies the modulated wave signals SIN, COS with parameters cos phi, sin phi, and executes a subtraction of the multiplied value to obtain an error-correlation value epsilon. An angle calculations section in the microcomputer receives a detected value epsilonc obtained by multiplying the error-correlation value epsilon with a binary detection signal Rd. The binary detection signal Rd corresponds to a positive sign or a negative sign of the signal Sc. The sampling time of the AC excitation signal Sc is set to a time at which an absolute value of the AC excitation signal Sc exceeds a regulated value.
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