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Sensor Sense: Hall-effect current sensors
to an a/d converter, microprocessor, or microcontroller. Hall-effect current sensors are virtually immune to environmental contaminants. They're rugged and suitable for use under severe conditions. These devices work well with dc motors, automotive applications, robotic, and heavy-machinery sensing
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First SOIC8-Packaged Hall-Effect Current Sensor With Integrated Current Path Introduced
mixed-signal power semiconductors and Hall-effect sensors. It maintains a leadership position in the integrated magnetic sensor and integrated motor driver product segments. With over 2,000 employees, Allegro is headquartered in. First SOIC8-Packaged Hall-Effect Current Sensor With Integrated Current Path
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PM DC Motors
be as much as 13 to 17% torque ripple, which causes cogging in switched brushless motors. This effect may be bad for some applications. One alternative is to use a sine-wave drive which has a theoretical ripple of zero (actually 1 to 2%). But sine-wave drivers can cost more than three times as much
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Appliance motors turn green
electric motors. In fact, growing use of permanent magnets in applications ranging from automotive drives to cellular-phone-vibrator motors has actually reduced magnet prices thanks to greater production. However, the need to measure shaft angles with such position sensors as Hall-effect devices
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Mathematics of Electronic Motor Control
-based commutation. There are three common techniques used to control brushless motors, Hall-based (also known as 6-step commutation), sinusoidal commutation, and field oriented control. Of these, Hallbased is the simplest to implement, and requires the use of 3 Hall-effect or optical position sensors
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Brushless dc Motors in Medical Applications
switch is replaced with electronic switches in BLDC motors with the polarity-reversal timing controlled by an electronic circuit. Ordinarily, BLDC motors use Hall-effect devices (HFD) to sense rotor position and control the electronic drive of the motor. However, by monitoring motor back- EMF, it’s
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Brushless DC (BLDC) Motor Fundamentals
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. It is important
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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