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HYBRID TRANSAXLE HBC-33 < FUNCTION DIAGNOSIS > D E F G H I J K L M A B HBC N O P Furthermore, the MG ECU calculates the rotational speed based on the amount of change in the position within a given length of time. • Because an alternating current flows from this resolver to the excitation coil at a constant frequency, a con- stant frequency is output to the coils S and C, regardless of the rotor speed. The rotor is oval, and the dis- tance of the gap between the stator and the rotor varies with the rotation of the rotor. Consequently, the peak values of the waveforms output by the coils S and C vary in accordance with the position of the rotor. • The MG ECU constantly monitors these peak values, and connects them to form a virtual waveform. The MG ECU calculates the absolute position of the rotor from the difference between the values of the coils S and C. It determines the rotor direction based on the difference between the phases of the virtual waveform of the coil S and the virtual waveform of the coil C. Furthermore, the MG ECU calculates the rotational speed based on the amount of change in the rotor position within a given length of time. JMCIA0055GB |