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  • Rotary encoders for motors
    times a special sensor called an encoder is attached to the motor shaft to monitor rpm. Encoders generate one or more series of pulse trains that feed to the motor-drive electronics. From these pulses, the drive determines motor rpm, direction of rotation, and even the amount of rotation far more
  • Eliminating Damage from Motor Shaft Currents Through Tachometers and Encoders
    Since the introduction of variable speed electronic controls for DC and AC motors, users have noted a troubling problem; voltage potential is sometimes induced on the shaft of the motor.
  • Commutation of a BLDC Motor with Various Pole-Pairs Can Be Simplified By Using Absolute Encoder Feedback - White Paper (.pdf)
    fashion. Commutation of a brushless DC motor is dependent on the position of the rotor. It is essential to have feedback devices attached to the motor shaft to indicate the current rotor position to the controller. With various forms of feedback devices available, magnetic hall sensors and optical
  • Fundamentals of Industrial Encoder Sensing Technologies, Motion Detection Theory and Methods, and Signal Output Styles
    Encoders are used to determine the position, velocity and direction of a motor shaft or other mechanical motion. They provide information required for the precise control of a variety of applications, such as positioning a rotary table, pick and place, machine assembly, packaging, robotics and more
  • Stator Coupling Model Analysis - White Paper (.pdf)
    to connect encoders to the motor shafts (rotor part), whereas a stator coupling is used to connect encoders to the motor housing (stator part). A rotor coupling rotates together with the motor shaft whereas a stator coupling remains static during the operation of the motor. Proper coupling design
  • Medical Device Link .
    (Ober-Ramstadt, Germany) covers a torque range from 0.4 to 40 N *m at flange dimensions from 40 to 188 mm. The motors are made from high-grade neodymium. Resolvers or optical encoders are used as motor position sensors. Options such as a holding brake or keyed shaft are available. The company also offers digital
  • Eliminating sensors from closed-loopcontrol
    . Direct torque control is a motor-control method for ac drives that accurately regulates motor speed and torque without encoder feedback from the motor shaft. Eliminating encoders can simplify installation and system maintenance, and often results in less downtime, better control, and higher throughput
  • How to Apply Direct-Drive Linear Servomotors
    . For the Quickshaft Series, the lack of an external encoder lets the overall size of the motor housing be about 0.5-in. wide, 0.75-in. tall, and 2-in. long. The short 2-in. housing can produce linear shaft motions from +-10 to +-40 mm at peak forces greater than 9 N. Needless to say, such a novel motor

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