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Technical theory of a motor


A motor is a device to exchange from electrical power to mechanical power and exchanged mechanical power (rotary motion) is generated by permanent magnet and electrical wire.

To understand the technical theory of a motor, we need to know a power act on magnet field and current.


Magnet flux (B) that is made by permanent magnet goes toward from N pole to S pole.

When we put an electric wire right angle and current (I) is applied, we can get mechanical force (F).

This force is shown below formula and called "BLI law".


F=BLI
F: Force
B: Magnetic flux
L: Wire length in the magnetic field
I: Current


The direction of this force is shown "Law of left hand of Fleming", thumb shows F (Force way), and first finger shows B (way of magnet flux), second finger shows I (current way).


A motor is a device to generate continuous torque with multi coils, commutator and brush that are used to change current direction up to these technical theories.


 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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CITIZEN MICRO Co.,Ltd.
DC Motor Division
15-1,2 Choume,Fujimi,
Sayama City,Saitama,
350-1306,Japan
motor@micro.citizen.co.jp
 
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