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In any electric motor, rotation is caused by two magnetic fields that oppose each other. In some motors, both fields are created by coils of wire - electromagnets. In other motors, one field is electromagnetic and the other comes from one or more permanent magnets. In the permanent magnet (PM) motor, the magnetic field from the permanent magnet(s) are constant (obviously) and the other field is turned on and off, or 'commutated' at just the right time so the fields oppose, causing rotation. Commutators can be mechanical - you have probably seen the brass segments around the rotor's end that the brushes touch - this is the commutator. In some motors, mostly small cooling fans and the like, commutation can be electronic using position sensors and switching transistors. These motors are called 'brushless'. Since the power of the motor comes from the opposing magnetic fields pushing on each other, the PM motor is only as powerful as the magnets used in its construction. There is quite a bit of research going on to create very powerful magnets for high performance PM motors used in radio controlled cars, planes and other applications where a powerful yet small motor is needed.
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∙ 15y ago
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∙ 11y agowith magnetic vortex
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Is magnetite a magnet?
No, it's a permanent magnet. It consists of an iron oxide, and iron is a permanent magnet.
Are permanent magnets are used in doorbells?
no it is not . a temporary magnet is used instead. If you use a permanent magnet, the doorbell will keep on ringing
How does the magnet works on cold and hot temperature and what important idea.?
the magnet that works better is the cold magnet
Is iron a permanent magnet?
Yes, as it is a magnet that will remain for a long time that makes it permanent. : ) x
What is the material used in permanent magnet?
ferromagnetic
What is the motor parts of the body?
The wires and the permanent magnet
What is a permanent magnet synchronous motor?
combination of sinusoidally wound stator and a permanent magnet for rotor design is the basis of PMSM.
Where can a permanent magnet motor be purchased?
One can purchase a permanent magnet motor online from Grainger where they have many available for around $400. One can also find them for purchase on ebay.
How is a DC permanent-magnet motor reversed?
Reverse the polarity of armature windings of the motor.
What are the two types of motors?
permanent magnet motors and series motor
What part of an electric motor repels the poles of the permanent magnet?
commutator
What is PMDC motors?
PMDC-Permanent Magnet DC motor is a DC machine where the Permanent Magnets form the stator of the machine instead of conventional Field winding. It works on the same principle of electromagnetic induction.
Two advantages of a permanent magnet type starter motor?
size and weight
What are the two types of dc motors?
permanent magnet motors and series motor
Is a refrigerator an example of a permanet magnet or magnetic material?
A refrigerator is not a magnet, however it does contain an electric motor, and within that motor are permanent magnets (as well as electromagnets).
What is a permanent magnet motor?
A motor with permanent magnets rather than field coilsA:A non-functional contraption often peddled as a free-energy generator.
What types of magnet either permanent or electromagnetic for AC or DC relay?
What types of magnet either permanent or electromagnetic for AC and DC relay?"how DPDT relay works?
