| 摘要 |
PURPOSE:To compute the rotation angle of a rotor by taking the trigger signal generated by shaping a waveform of induced AC voltage, by supplying a two- phase AC from a two-phase excitation circuit to the stator of a resolver and generating an induced AC voltage having the rotation angle information of the rotor in the resolver rotor. CONSTITUTION:The clock of a clock oscillator 1 is counted by a counter 2, and sin and cos two-phase AC signals are outputted from a two-phase AC generating circuit 3. These two-phase AC signals sin, cos are supplied to a resolver stator 4A to output induced AC voltage having rotation angle informa tion to a resolver rotor 4B. This AC voltage is inputted to a waveform shaping circuit 6 through an induced voltage signal detection line 5 and the waveform thereof is shaped to output a rectangular wave signal triggering a trigger signal generating circuit 9. A signal is outputted on the basis of said rectangular wave signal by the circuit 9 at every rising and falling of the output data from the counter 2 and latched to a latch circuit 10 and rotation angle information thetar, thetar+pi are detected by a microcomputer 11.
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