A BLDC Motors is made up of a rotor in the form of a permanent magnet as well as a stator consisting of polyphase armature windings. It differs from a conventional DC motor due to the fact that it doesn’t feature brushes, and commutation is electrical, using an electronic drive to feed the stator windings.
A Brushless DC Motor can be constructed in two distinct ways - Firstly, by housing the rotor outside of the core, with the windings inside. Secondly, they can feature windings outside of the core. In the former arrangement, the rotor magnets act as insulators, reducing the rate of heat dissipation from the motor, which in turn allows it to operate at a low current (found in a fan for example). In the second arrangement, the motor dissipates greater heat levels, thus causing an increase in torque (found in a disk drive for example).
As the rotor turns, an electronic drive switches the supply voltage between the stator and the winding which causes the brushless DC motors to rotate. The rotor position is monitored by the transducer (which can be either optical or magnetic), this supplies information to the electronic controller, and based on this position, the stator winding to be energized is then determined.The electronic drive comprises transistors (each phase has 2) operated via a microprocessor.
Value-added features
A magnetic field is created due to the interaction between the permanent magnets and the current in the stator windings which generates mechanical torque. A constant supply of current to the stator ensures a constant angle between 0 to 90 degrees is maintained between interacting fields. Hall Sensors are typically either mounted on the stator or the rotor. When the rotor passes through the hall sensor (orientated by North or South Pole), it will generate either a high or a low signal. Based on the combination of these signals, the winding to be energized is then defined. The position of the magnetic field created by the windings shifts position as the rotor moves to catch up with the stator field. This shift causes the motor to keep running.
In a brushless motor a permanent magnet rotates around a fixed armature. This eliminates the issues of connecting a current to the moving armature. An electronic controller is used in place of the brush/commutator assembly of the brushed electric motor. This controller constantly redirects the phase to the windings to keep the motors turning. Precision timed power distribution is achieved by the application of a solid-state circuit instead of a brush/commutator system.
The cost of a Brushless DC Motor has declined since its first introduction. This decrease in cost, as well as other contributing factors, make BLDC motors a very popular choice for a wide variety of applications.
ISL Products are a leading supplier and manufacturer of value-added electromechanical component solutions. They provide BLDC motor solutions based on your specific requirements. Over the years, and as technology has advanced, ISL Products have worked closely with their customers to design and manufacture tailored solutions that meet their exact needs, to extremely high standards. For more information, visit - https://islproducts.com/
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