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  • Application Note: Understanding Torque Ripple
  • Limited-Angle Torque Motors
    the armature core to the outer housing than in toroidal versions, which can rely only on the mounting tabs for heat conduction. Thus, slot-wound types generally can carry heavier loads than corresponding toroidally wound motors. Slot-wound LATs, however, exhibit more torque ripple (cogging) and generate
  • Optimization of Torque in a Permanent Magnet Synchronous Motor (PMSM) for Traction Applications
    - maximum average torque and minimum torque ripple.
  • Reducing cogging torque in brushless motors
    is a Hall-effect device. The shape of the magnetic flux density in the air gap of an assembled motor is an indicator of its cogging torque. An example are these three curves shown for one pole pair. Each theoretical curve represents different magnetization and pole-arc angles for the same air gap length
  • The "no-cog " motor
    Brushless dc motors without wire windings rotate smoothly with practically no cogging or torque ripple. This ThinGap motor uses a slotless BLDC design that virtually eliminates velocity and torque ripple from cogging action. The unconventional rotor design also led to its unconventional mechanical
  • PM DC Motors
    brushless motors exceeds that for conventional brushless motors by 250 to 800%. Similarly, torque-to-weight ratios surpass those of conventional types by 40 to 90%, while power-to-weight ratios are from 50 to 200% greater. Additional improvements have been made to reduce torque ripple. There may
  • Coreless DC Motors
    ripple or cogging plus a resisting torque that decreases motor efficiency. The absence of iron eliminates cogging and the coreless motor operates smoothly, even at low speeds. Elimination of the iron core dramatically diminishes rotor inductance and resultant arcing. Commutator arcing
  • Brushless DC Motors
    . Trapezoidal-powered motors develop about 10% more torque than those on sine-wave power. Sinusoidal-powered motors, however, exhibit less torque ripple and operate smoother at low speed. Thus, sinusoidal-powered motors are often used for machining, grinding, coating, and other operations calling for fine surface

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