Patent ID: 11881806
Assignee: RENESAS ELECTRONICS CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 7:
8. The motor control device according to claim 7,
wherein the tracking loop circuit comprising:
first and second multipliers;
a subtractor that subtracts an output of the second multiplier from an output of the first multiplier;
a comparator coupled to the subtractor;
a synchronous detection circuit coupled to the comparator;
a proportional and integral (PI) control circuit coupled to the synchronous detection circuit;
a phase accumulator and DDS circuit coupled to the PI control circuit;
a first low-pass filter coupled to the first multiplier;
a second low-pass filter coupled to the second multiplier;
an amplifier coupled to the first and second low-pass filters;
an analog-to-digital converter (ADC) coupled to the amplifier,

wherein when the tracking loop circuit calculates the rotation angle θ:
the phase accumulator and DDS circuit operates as a phase accumulator,
the first multiplier multiplies a first signal including a SIN θ of the output signal of the resolver by a COS wave outputted from the phase accumulator and DDS circuit, and
the second multiplier multiplies a second signal including a COS θ of the output signal of the resolver by a SIN wave outputted from the phase accumulator and DDS circuit,

wherein when the tracking loop circuit operates as the DDS:
the phase accumulator and DDS circuit operates as the DDS,
the first multiplier multiplies one of the first and second signals by a COS wave outputted from the phase accumulator and DDS circuit, and
the second multiplier multiplies one of the first and second signals by a SIN wave outputted from the phase accumulator and DDS circuit.