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  • Sorting out shaft connections
    Motors and gearboxes that generate high torque and acceleration may make shaft keys obsolete. Designers should analyze stresses and backlash when weighing keyed versus keyless shafts. Stresses in the keyway are critical in evaluating the shaft's torque capacity. Opposing forces exerted by the shaft
  • Coupling Motion Systems for Zero Backlash
    servocoupling designs offer varying speed and misalignment capabilities. See more on the basics of servocouplings in the Video Library of Such couplings must have zero backlash to ensure accuracy and repeatability. In other words, there can be no play between components. If the motor shaft turns 90
  • 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
  • Eliminating compliance in servosystems
    A traditional motor-mounting arrangement consists of a housed motor coupled to a lead or ball-screw shaft by a flexible coupling and a motor mount. A direct drive consists of a rotor assembly fabricated directly on the ball screw, eliminating duplicate motor parts, compliant couplings, and brackets
  • Frequency Response Plots That Pinpoint Problems
    reaches satisfactory performance. A quick frequency response test shows a resonant peak at 685 Hz. This happens with no motor coupling or similar normal sources of mechanical resonance. The mechanical resonance comes from the mass resonating with the motor-shaft deflection. Filtering this peak out
  • Pump Basics
    ). The impeller is in turn secured to the shaft-pump, directly fit onto the motor transmission shaft or coupled to it using rigid coupling.
  • Definite and Special-Purpose Motors
    of a gear-reduction unit with an integral or flange-mounted rotor. The main advantage of a gearmotor is that the driving shaft may be coupled directly to the driven shaft. Belts, pulleys, chains, or additional gearing to step down motor speed are not needed. Also, coupling or belting of a motor
  • May the force loop be with you
    controlled force. Controller force is usually applied by an actuator or thruster. There are several choices including hydraulic, pneumatic, rotary screw, or rotary belt thrusters. Tubular linear motors are an attractive alternative. They use a shaft with integral bearings that slides into a stator

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