Resolver vs encoder?
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Topic: Resolver vs Encoder — devices for measuring a shaft’s angular position. Resolver outputs continuous analog sin/cos signals; Encoder outputs discrete digital quadrature A/B pulses.
Key idea: A resolver senses angle as continuous analog sin and cos amplitudes. Small angle changes produce smooth voltage changes, ideal for harsh environments.
Key idea: An encoder reports angle as discrete steps using digital A/B pulses. Direction is read from the phase lead; higher PPR gives finer resolution.
Both resolvers and encoders are devices used to measure the angular position of a rotating shaft, but they have different operating principles, advantages, and disadvantages. Here's a comparison of the two:
Operating principle:
Resolvers: They are analog electromechanical devices that use a rotary transformer to convert angular position into an analog electrical signal.
Encoders: They are digital devices (optical, magnetic, or capacitive) that convert angular position into a digital signal.
Resolution and accuracy:
Resolvers: They typically have lower resolution and accuracy compared to encoders.
Encoders: They can offer high resolution and accuracy, depending on the type and quality of the encoder.
Signal processing:
Resolvers: They require more complex signal processing, as their output is an analog signal.
Encoders: They provide digital output signals, which are usually easier to process and interface with control systems.
Environmental tolerance:
Resolvers: They are generally more robust and can tolerate harsh environments, high temperatures, and electromagnetic interference.
Encoders: They can be more sensitive to environmental factors, such as dust, moisture, and electromagnetic interference, depending on the type and construction.
Longevity and maintenance:
Resolvers: They are less prone to mechanical wear and tear, making them suitable for long-term and low-maintenance applications.
Encoders: They can be more susceptible to mechanical wear, especially in the case of optical encoders with moving parts.
Cost:
Resolvers: They can be more expensive due to their construction and materials, but this may be offset by their durability and longevity.
Encoders: They can be less expensive, especially in the case of incremental encoders, but their lifespan might be shorter in harsh environments.
++ What is resolver?
The choice between a resolver and an encoder depends on the specific requirements of the application, such as resolution, accuracy, environmental conditions, and cost. Resolvers are a better choice for applications that require high reliability and robustness in harsh environments, while encoders are more suitable for applications that require high resolution, accuracy, and easier signal processing.
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