Which device typically provides analog sine/cosine signals for motion feedback?

Which device typically provides analog sine/cosine signals for motion feedback?

• A. Digital pulses
• B. 4-20 mA current loop
• C. Analog sine/cosine signals
• D. Temperature signals

Answer: (C)

When measuring motion, you need feedback that continuously encodes the shaft angle. Analog sine and cosine signals do this perfectly because as the shaft rotates, both outputs vary smoothly and their relative phase lets the controller determine the exact position and speed. The device that typically provides these two simultaneous analog signals is a resolver, which outputs a sine wave and a cosine wave whose amplitudes and phase correspond to the rotor position. In contrast, digital pulses come as discrete steps, which limit resolution unless many pulses are counted and interpolated; a 4-20 mA loop carries a single analog value but not the two-channel phase information needed for precise angle measurement; temperature signals are unrelated to rotational position. So the analog sine/cosine signals option best fits the requirement for motion feedback, because they carry continuous, two-channel angular information essential for accurate control.

When measuring motion, you need feedback that continuously encodes the shaft angle. Analog sine and cosine signals do this perfectly because as the shaft rotates, both outputs vary smoothly and their relative phase lets the controller determine the exact position and speed. The device that typically provides these two simultaneous analog signals is a resolver, which outputs a sine wave and a cosine wave whose amplitudes and phase correspond to the rotor position.

In contrast, digital pulses come as discrete steps, which limit resolution unless many pulses are counted and interpolated; a 4-20 mA loop carries a single analog value but not the two-channel phase information needed for precise angle measurement; temperature signals are unrelated to rotational position. So the analog sine/cosine signals option best fits the requirement for motion feedback, because they carry continuous, two-channel angular information essential for accurate control.