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A New Absolute Inductive Transducer for Brushless Servomotors

From Admotec Inc.
 

 
Today, frameless brushless (pancake) resolvers are commonly used on AC and brushless DC servomotors to provide commutation, position, and velocity information to the servo controller. These angular position transducers give a constant signal representing the absolute position of the motor shaft within one revolution, making them well suited for this purpose. However, traditional resolvers are complex and expensive to manufacture, limiting their use in industrial servomotors. A new type of absolute inductive position transducer-one that is mechanically and electrically compatible with traditional resolvers-is now available. This device utilizes a solid rotor without windings and overcomes the disadvantages of traditional resolvers. As such, it offers higher speed operation, better reliability, and lower cost. Flexible motion control is unthinkable without precise information about the position of each axis. For this purpose, different types of shaft angle sensors are used, often built into the driving motors. On the basis of their physical design, these angular transducers can be classified into two main groups:
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