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  • Direct Drive (DDR) Rotary Table Construction
    Torque motors are also called "frameless" motors. They don't have housings, bearings, or feedback devices. In this sense the motor is a kit and meant to be part of the machine structure. Torque motors are designed as direct drives. They eliminate the need for gearboxes, worm-gear drives, and other
  • Torque motors do the trick
    Direct-drive technology seems to be an ideal way to increase productivity, accuracy, and dynamic performance. It can also lower costs, simplify designs, and reduce wear. Torque motors are frameless kit motors consisting of a permanent-magnet rotor and laminated stator. A bridge keeps the rotor
  • Wedge drives precision elevator
    . "The inclined-plane approach offers superior performance to traditional -axis stages, " says Alan Petersen, Primatics' president. "The PZA offers a lower profile and easy access to all sides of the load. " Using a frameless motor eliminates a motor coupler and external motor, which reduces the table
  • Avoiding the runaround with direct-drive rotary motion
    not include existing bearings, such as indexing and rate tables. Cartridge DDR motors are a new category of directdrive technology. They combine the performance benefits of frameless DDR motors with the ease of installation of a full-frame motor, and cost less than conventional DDR systems. Their unique
  • A New Absolute Inductive Transducer for Brushless Servomotors
    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
  • Observant resolvers
    of the control system. Resolvers are common position-sensing devices. There are two basic resolver configurations; housed and frameless. Housed resolvers have independent bearings and an

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