Speed And Direction Control of Motor

AI Thread Summary
To control the speed and direction of AC motors, Variable Frequency Inverter (VFI) drives are recommended, as they allow for frequency adjustments. For three-phase motors, direction can be altered by swapping any two of the three phases. Speed control is achieved by changing the frequency of the AC supply, which affects the rotation speed of the stator magnetic field. PWM can also be utilized to generate a sine wave of variable frequency, enhancing control capabilities. Understanding these principles is crucial for effective motor management.
ENE
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Hello,
In case of DC we use H-Bridges To control Dc motor direction and Speed with PWM.
But in case of AC motor Single phase and 3 phase motor how to control Speed and direction?
 
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Hi...
I reckon your best bet would be a Variable Frequency Inverter drive.
 
How it will work i mean in H bridges there is mosfet with PWM channel.
in the we will change the frequency of 3 phase how?
 
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You can shift the direction of an 3 phase motor by swaping two of its three phases. The speed depends on how hast the stator magnetic field rotates. So you can change the AC frequency if possible or change the supply voltage, but i recommend someone who works with electrical machines to reply to you.
 
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Hello,
I know the theory procedure we use PWM with sin table in look up i think
 

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