Toyota Camry Hybrid AHV40 Manual page 22

TH-22
Speed Sensor/Resolver (for MG1 and MG2)
D This is an extremely reliable and compact sensor that precisely detects the magnetic pole position, which
is indispensable for ensuring the efficient control of MG1 and MG2.
D The stator of the sensor contains three types of coils: excitation coil A, detection coil S, and detection
coil C. The detection coils S and C are electrically staggered 90 degrees.
The rotor is oval, the distance of the gap between the stator and the rotor varies with the rotation of the
rotor.
D The flow of an alternating current into an excitation coil A results in the output of signals of a constant
frequency. Coil S and coil C output values that correspond to the position of the rotor. Therefore, the MG
ECU detects the absolute position based on the difference between the coil S and coil C output values.
Furthermore, the MG ECU calculates the rotational speed based on the amount of change in the position
within a given length of time.
THS II (TOYOTA HYBRID SYSTEM II)
Excitation
Coil A
Stator
Rotor
Speed Sensor (Resolver)
Detection
Coil S
Detection
Coil C
277TH104