What is the difference between a permanent magnet motor and an excitation motor?
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Current excitation refers to the DC current-induced excitation of the main pole magnetic field in a DC motor. What distinguishes an excitation motor from a permanent magnet motor if the permanent magnet used to generate the main pole magnetic field is used instead of the current excitation? I'll introduce myself to you below.
1. Provide different magnetic fields
A permanent magnet creates a magnetic field that powers the permanent magnet motor. The energy is transformed into a magnetic field to produce a enough magnetic field, therefore the efficiency is rather low. The permanent magnet motor itself may create an adequate magnetic field without using energy, and magnetic field containment phenomena are easy to occur. Permanent magnet motor efficiency can increase to over 90%. The excitation motor has the advantage of having a lower production cost and a simpler manufacturing process than the permanent magnet motor. As a result, excitation motor applications are more prevalent in the market nowadays.
2. Different working methods
When the excitation motor is turned on, the modest electromotive force produced by the external power source or the permanent magnet will provide the initial electromotive force, which will cause the excitation coil to generate a magnetic field. It can rely on its own output voltage to function after operation. Only the magnetic field, which the permanent magnet can supply, is required to produce the initial electromotive force.
3. Different characteristics
Excitation motors differ from permanent magnet motors in that they have a more complex structure, a smaller rotor magnetic field, no excitation winding, no carbon brush, no slip ring, a larger air gap, no contact, high product reliability, no external regulator, less magnetic flux leakage, and a more adequate output circuit. The battery is easy to empty, the efficiency is low, the temperature of the entire machine increases, and the carbon brushes and slide rings are vulnerable to damage when the engine is running at idle speed.
The above is the difference between permanent magnet motor and excitation motor introduced by Vshida Micromotor. For more information, please feel free to consult us.
