Sensor working process
Oct 29, 2018

Providing ±15V power to the inductor, the crystal oscillator in the excitation circuit generates a 400Hz square wave, and the TDA2030 power amplifier generates an AC excitation power source, which is transmitted from the stationary primary coil to the rotating secondary coil through the energy toroidal transformer T1. The obtained AC power source obtains a ±5V DC power supply through a rectifying and filtering circuit on the shaft, and the power supply is used as an operating power supply of the operational amplifier AD822; the high-precision regulated power supply composed of the reference power supply AD589 and the dual operational amplifier AD822 generates a precision of ±4.5V. DC power supply, which acts as both a bridge power supply and an operating power source for amplifiers and V/F converters. When the elastic shaft is twisted, the strain signal of the mV level obtained by the strain bridge is amplified by the instrumentation amplifier AD620 into a strong signal of 1.5v±1v, and then converted into a frequency signal by the V/F converter LM131, and passed through the signal toroidal transformer T2. The rotating primary coil is transmitted to the stationary secondary coil, and then filtered and shaped by the signal processing circuit on the outer casing to obtain a frequency signal proportional to the torque received by the elastic bearing. The signal is TTL level and can be provided to the dedicated two. The secondary meter or frequency meter display can also be sent directly to the computer for processing. Because there is only a few millimeters of clearance between the dynamic and static rings of the resolver, and the upper part of the inductor shaft is sealed inside the metal casing to form an effective shielding, it has strong anti-interference ability.

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