Which motion feedback component is known for providing analog sine/cosine signals and is robust in harsh environments?

Which motion feedback component is known for providing analog sine/cosine signals and is robust in harsh environments?

• A. Encoder
• B. Potentiometer
• C. Resolver
• D. Hall effect sensor

Answer: (C)

An essential trait being tested is the ability to provide analog sine and cosine feedback signals while staying rugged in harsh environments. A resolver fits this role because it’s a rotary transformer that yields two analog outputs proportional to the shaft angle: one follows a sine wave and the other a cosine wave, typically 90 degrees apart. These two signals can be demodulated and combined to determine position with high accuracy. The construction is deliberately rugged—sealed, well insulated, and tolerant of dust, moisture, vibration, and temperature changes—making resolvers a go-to choice in demanding industrial and aerospace settings. Encoders usually provide digital or pulse-based information and can be sensitive to EMI and contamination; a potentiometer relies on a wear-prone contact track and isn’t fit for harsh environments; Hall effect sensors can be robust but generally don’t deliver the traditional sine/cosine two-phase feedback that resolvers provide for precise angle computation.

An essential trait being tested is the ability to provide analog sine and cosine feedback signals while staying rugged in harsh environments. A resolver fits this role because it’s a rotary transformer that yields two analog outputs proportional to the shaft angle: one follows a sine wave and the other a cosine wave, typically 90 degrees apart. These two signals can be demodulated and combined to determine position with high accuracy. The construction is deliberately rugged—sealed, well insulated, and tolerant of dust, moisture, vibration, and temperature changes—making resolvers a go-to choice in demanding industrial and aerospace settings.

Encoders usually provide digital or pulse-based information and can be sensitive to EMI and contamination; a potentiometer relies on a wear-prone contact track and isn’t fit for harsh environments; Hall effect sensors can be robust but generally don’t deliver the traditional sine/cosine two-phase feedback that resolvers provide for precise angle computation.