Resolvers - principle of operation
A resolver is an electromechanical measuring device that converts rotational motion into electrical signals. It consists of two main components: a stator and a rotor. The resolver's stator contains three electromagnetic coils, evenly distributed around the circumference of the wheel, while the rotor consists of three windings, also evenly distributed around the circumference of the wheel and attached to a rotating axle. Using electromagnetic induction between the stator and rotor, the device generates analog signals that precisely reflect the rotation angle, down to a fraction of a degree. Resolver coils are often protected with an additional layer of resin, further increasing the device's resistance to dust and mechanical damage.
Resolver vs. encoder - which product provides the highest quality?
An encoder, unlike a resolver, is a primarily digital device that, in addition to signal processing, also collects and stores data from the operation of a motor or other drive device. High precision increases the optimization of such a device's operation, but this comes at the cost of reduced durability and operational sensitivity, and consequently, higher implementation and maintenance costs.
Adding an additional digital module to the resolver transforms it into a product that is both durable and long-lasting, while also matching the performance of the latest digital converters. This makes the resolver the most optimal solution among industrial automation manufacturers. A standard feature of resolver production is their high degree of interchangeability, thanks to similar operating parameters such as supply voltage and operating frequency.
Resolvers are designed and manufactured for harsh operating conditions, such as vibration, high temperatures, dust, and humidity. Thanks to the mechanical separation of the two measuring system components, the resolver does not transmit shared mechanical vibrations, which translates into a longer service life when the engine is worn out. The resolver offers not only high reliability and precision but also resistance to extreme environmental conditions, resulting in long-term and reliable operation in harsh operating conditions.
Summary
Resolvers are a highly efficient and reliable solution among a variety of measurement systems that transmit angular position information to a controller or drive. This article highlights the greatest advantages of resolvers as a component of industrial automation, also describing their main advantages over digital measurement systems. The PLE Service online store offers a wide range of resolvers as spare parts, and the company guarantees assistance in selecting a replacement.
