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  • ThinGap Torque Ripple Brief (.pdf)
    Torque ripple in 3-phase brushless motors is caused by any deviation of the back emf voltage or current waveforms from a perfect sinusoidal signal. Therefore, providing a sinusoidal current and voltage waveform is the best way to minimize torque ripple on 3-phase brushless motors. Other control
  • 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.
  • Motor Eliminates Cogging Torque for Ultra Smooth Servo Track Writer
    application the spindle nose deviation error of 0.15-micro-inch (3.81 nanometers) was unacceptably high. While looking for a solution, we discovered a new slotless BLDC motor technology without wire windings developed by ThinGap, Inc., which minimizes cogging torque and torque ripple to deliver extremely
  • 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

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