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Speed Control PMSM VF Method

The document outlines a study on speed control of a Permanent Magnet Synchronous Motor (PMSM) using the V/F (Voltage to Frequency) method. It details the necessary apparatus, theoretical background, experimental procedure, and results, confirming that the motor speed varies linearly with frequency while maintaining constant torque. The conclusion highlights the effectiveness of the V/F control method for PMSM speed regulation.

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12 views2 pages

Speed Control PMSM VF Method

The document outlines a study on speed control of a Permanent Magnet Synchronous Motor (PMSM) using the V/F (Voltage to Frequency) method. It details the necessary apparatus, theoretical background, experimental procedure, and results, confirming that the motor speed varies linearly with frequency while maintaining constant torque. The conclusion highlights the effectiveness of the V/F control method for PMSM speed regulation.

Uploaded by

ys920973
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOCX, PDF, TXT or read online on Scribd
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Speed Control of PMSM using V/F

Method
1. AIM
To study and implement the speed control of a Permanent Magnet Synchronous Motor
(PMSM) using the V/F (Voltage to Frequency) control method and to observe its
performance characteristics.

2. APPARATUS
• PMSM (Permanent Magnet Synchronous Motor)
• Three-phase Inverter / VFD (Variable Frequency Drive)
• Power supply (AC Source)
• Microcontroller / DSP control unit (if required)
• Tachometer / Speed sensor
• Voltmeter and Ammeter
• Connecting wires and safety equipment

3. THEORY
The Permanent Magnet Synchronous Motor (PMSM) is widely used in high-performance
drive applications due to its high efficiency and precise speed control capability. V/F
control, also known as scalar control, maintains a constant ratio between the stator voltage
and frequency to keep the air-gap flux constant. This ensures that the motor operates
efficiently without magnetic saturation or under-excitation.

By varying the supply frequency, the synchronous speed of the PMSM is changed. As the
voltage is adjusted proportionally to frequency, torque production is kept nearly constant
over the operating range. V/F control is simple, cost-effective, and widely used in
applications where precise torque control is not critical.

4. PROCEDURE
1. Connect the PMSM to the three-phase inverter output terminals.
2. Connect the speed sensor (tachometer) to measure motor speed.
3. Power ON the setup and set the VFD to operate in V/F control mode.
4. Gradually vary the frequency from the minimum to the rated frequency while
maintaining a constant V/F ratio.
5. Record motor speed, stator current, and voltage for each frequency setting.
6. Plot the characteristics of speed vs frequency.
7. Switch OFF the power supply after the experiment.

5. RESULT
The speed of the PMSM was successfully controlled using the V/F control method. The
motor speed was found to vary almost linearly with the applied frequency, confirming the
synchronous nature of the motor.

6. CONCLUSION
The experiment demonstrated that the V/F control method is an effective way to control the
speed of PMSM. The motor maintained constant torque capability over a wide range of
speeds while keeping the V/F ratio constant.

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