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  • Optimized Stator Design
    rise and lengthens the motor's functional life. Newer designs for brushless dc motors are using segmented lamination stator technology to reduce winding and thermal resistance, and achieve 40 percent higher thermal efficiency than traditional brushless motors of the same size.
  • Intelligent Vacuum Controller
    Induction motors, the workhorses of industry, rotate at a fixed speed that is determined by the frequency of the supply voltage. Alternating current applied to the stator windings produces a magnetic field that rotates at synchronous speed. This speed may be calculated by dividing line frequency
  • Controlling 3-Phase AC Induction Motors Using the PIC18F4431
    than the PIC18F452 or PIC16F7X7. Practically speaking, control of a 3-phase AC induction motor requires pulse-width modulated control of the six switches of a 3-phase inverter bridge connected to the motor's stator windings (Figure 1). The six switches form 3 pairs of "half-bridges", which can
  • Sensorless Brushless DC Motor Reference Design
    designers using Silicon Laboratories MCUs, significantly reducing the design time and time to market. Brushless dc motors consist of a permanent magnet rotor with a three-phase stator winding. Brushless dc motors evolved from conventional dc motors where the function of the brushes is replaced
  • Getting torque-to-inertia right
    The case of a pulsating-load testing machine shows how to ballpark qualities that are important for deploying electric motors. A 15-hp, E-182 frame brushless-dc motor from Powertec uses neodymium permanent magnets on the shaft and a conventional three-phase stator winding. An internal resolver
  • Brushless DC Motors
    widely used look much like brush-type motors. But brushless motors have a wound stator that surrounds a permanent-magnet rotor, an inverse arrangement from that for brush motors. And stator windings are commutated electronically rather than through a conventional commutator and brushes. Brushless
  • Choose wisely
    to keep manufacturing costs low and quality high. Stator windings are wound around a single pole tooth with each phase insulated for 480 V. None of the coils overlap to prevent coil-to-coil shorts. High-energy neodymium-iron-boron magnets produce optimum torque in a low-cogging electromechanical design
  • Microfiber Ring Protects Bearings from Shaft Currents
    and stator windings induces high-frequency currents in wind-turbine-generator shafts. These currents can reach levels of 60 A and 1,200 V or greater. If not diverted, the currents discharge through the generator's bearings, causing pitting and fluting, premature bearing failure and, potentially

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