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  • How to select Hall-effect sensors for brushless dc motors
    Brushless dc (BLDC) motors need to operate more efficiently as energy and cost. savings becomes a bigger concern for designers of electronic devices. One way to. help ensure greater efficiency is by selecting the correct bipolar latching Hall-effect sensor IC for electronic commutation in BLDC
  • Medical Device Link .
    Spotlight on Precision Motion Control A three-phase bridge-type brushless dc motor driver uses pulse-width modulation to control speed. The BLDC-350 has a brake input to enable dynamic and static motor braking. The controller includes Hall-effect sensors for commutation, and an integral heat sink
  • Using the dsPIC30F & dsPIC33F DSCs for Sensorless BLDC Control
    , the absolute. ℜ = Reluctance. position within an electrical cycle must be measured. MMF = Magno-Motive Force. For conventional energization, six equally spaced. commutations are required per electrical cycle. This is. Φ = Flux. usually implemented using three hall-effect or optical. Reluctance represents how
  • Brushless DC (BLDC) Motor Fundamentals
    DC motor, the commutation of a. Note: Hall Effect Theory: If an electric current. BLDC motor is controlled electronically. To rotate the. carrying conductor is kept in a magnetic. BLDC motor, the stator windings should be energized. field, the magnetic field exerts a trans-. in a sequence
  • What are Brushless DC Motors and how do they work?
    As the name states, brushless DC (BLDC) motor work on conventional Direct Current (DC) voltage without any brushes. Commutation is done electronically for these type motors. The three types of devices used for shaft position sensing are Resolvers, Encoders, and Hall Effect devices. Resolvers
  • Control Requirements for High-Precision, High-Speed Machining
    and the matching "six-step " commutation. algorithms working from hall-effect sensors, while suitable in many applications, fall short in. many high precision applications. The algorithms introduce significant torque ripple as a. function of motor angle, even statically. Furthermore, because
  • A New Absolute Inductive Transducer for Brushless Servomotors
    . Servomotors. Electrical energy has to be supplied to the rotor to gener-. Commutation of AC and brushless DC servomotors can. ate its AC magnetic field. However, as the rotor must be. be done with Hall-effect sensors to switch current into the. able to rotate freely it is not possible to use wires
  • 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

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