Brushless Dc Motor Effect Essay

1018 Words 5 Pages
Introduction: The brushless DC motor is a very common and unique piece of machinery that we take advantage of in everyday life. For example the Brushless DC motor is commonly found in computers. This essay will prove how a brushless DC motor works, its advantage and disadvantages also the difference between a brushless DC motor and a brushed DC motor. Throughout this essay multiple physics concepts and equations will be discussed.

Motor Effect: To summarise the motor effect it is the idea that the force caused by current flowing through a wire and causing a magnetic field around it. When this created magnetic field interacts with a magnetic field from a fixed magnet, it causes a force which moves the wire in relation to the right hand
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As there is no internal friction applied to the commutator it is able to spin at a higher velocity. Due no brushes more kinetic energy being able to be transferred to electrical potential energy and it wont be converted into, heat, sound and light energy. This will then reduce the amount of kinetic energy leaving the overall system that is created with the brushless DC motor. This will inturn provide a lot more output than a brushed motor.

Another advantage due to this motor not having brushes is that it can last for much longer periods of time as physical parts won 't wear out or break. In fact the life expectancy is over 10,000 hours. If brushed DC motors are used computers they will need to be taken out after 6 months of solid use and then replaced. This is all such a hassle, compared to a brushless DC motor that has the life expectancy of over 10,000 hours.

However, the brushless DC motor has a higher initial cost compared to the brushed DC motors, due to computer parts and chips make up the commutator. This extra cost is only fractional in the long run
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The coils are activated automatically one phase after the other by the drive electronics as organised by the hall effect sensors. This motor acts in a similar way to the three phase synchronous motors that utilise their own variable frequency drive. Contrast to this system, the Brushed DC motors use a rotating set of wire coils which is commonly referred to as the armature, and this acts as an electromagnet with two poles. A mechanical rotary switch known as the commutator, is used to switch the direction of the current to reverse, so that it flows through the armature and causes the poles of electromagnet to push and pull against the permanent magnets located on the outer edge of the motor. The commutator aids the process in which the polarity of the electromagnet poles of the armature is reversed as the electromagnet poles of the armature

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