Resolvers are absolute analog rotary encoders which are ideal for harsh environments. Unlike the conventional optical rotary encoder (with temperature-limiting internal optoelectronics), the resolver is similar to a transformer in construction, passive and does not incorporate any electronics. An external R/D (resolver-to-digital) interface is required which is also why the resolver can separately withstand extreme environments (-55/+155°C for frameless resolvers). There are two types of resolvers: Control Transmitter and Control Transformer. The Control Transformer features single excitation input to rotor input and sine/cosine stator outputs. The Control Transformer resolver requires both sine/cosine reference stator inputs and rotor output is a phase-shifted sine signal.R11 series are Size 11 (1.1-inch) brushless resolvers with 0.120-in OD solid shaft RE15L (36mmOD) is a small form factor, frameless brushless resolver RE165M (165mmOD) is our largest form factor, frameless resolver, most often used in antenna positioning systems and other similar large drive shaft applications Selecting a resolver is usually determined by shaft size, excitation frequency (a function of the R/D update rate & resolution requirements) and transformation ratio. We offer the frameless resolvers in other sizes and electrical configurations. Contact Dennis Horwitz at Micronor with your special requirements.
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