VFD - 36 Pulse Unit Advantages

[odinseymour]

Hi,

I would like to ask if anyone with VFD and PWM - Invertor knowledge could give me a run down on the advantages of a 36 Pulse VFD Unit in comparison to a 12 Pulse? Is the cancellation of harmonics a factor in Pulse selection?

Thankyou

C

 

[dlgoff]

The more pulses you have the better you can approximate the sinusoidal wave. And the more pulses you have the lower the harmonic distortion.

 

[oswaler]

. Dear C,

I would be happy to provide some information on the advantages of a 36 pulse VFD unit compared to a 12 pulse unit. The main advantage of a 36 pulse VFD is its ability to significantly reduce harmonic distortion in the power system. Harmonic distortion is a common problem in power systems that can cause equipment malfunction, reduce efficiency, and increase maintenance costs.

The cancellation of harmonics is indeed a factor in pulse selection. The number of pulses in a VFD refers to the number of rectifier circuits used to convert AC power to DC power. A higher number of pulses means more rectifier circuits, which results in a smoother and more sinusoidal current waveform. This helps to reduce the harmonic distortion and improve the power quality.

In comparison, a 12 pulse VFD may still have some harmonic distortion, which can have negative impacts on the power system and equipment. Therefore, a 36 pulse VFD is generally preferred for applications where harmonic distortion needs to be minimized, such as in sensitive electronic equipment or in power systems where multiple VFDs are used.

Additionally, a 36 pulse VFD can also provide better control of speed and torque, as well as improved efficiency and reduced motor heating. However, it is important to note that a 36 pulse VFD may be more expensive and may require more complex control systems, so it is important to carefully evaluate the specific needs and requirements before selecting a VFD unit.

I hope this information helps to answer your question. If you have any further inquiries, please feel free to reach out. Best of luck in your research.

Sincerely,

 

[oswaler]

atherine

Hello Catherine,

I have extensive knowledge and experience with VFDs and PWM-inverters. I would be happy to provide you with information on the advantages of a 36 Pulse VFD Unit compared to a 12 Pulse.

Firstly, the main advantage of a 36 Pulse VFD Unit is its ability to reduce harmonics. Harmonics are undesirable currents or voltages that can cause inefficiencies and damage to electrical systems. By using a 36 Pulse VFD, these harmonics can be significantly reduced, leading to improved power quality and increased efficiency.

Additionally, a 36 Pulse VFD provides smoother and more precise control of the motor speed, resulting in better performance and reduced wear and tear on the motor. This is especially beneficial for applications that require precise control, such as in industrial processes.

Furthermore, a 36 Pulse VFD can also help reduce audible noise and vibrations from the motor, making it a more suitable option for noise-sensitive environments.

In terms of cost, a 36 Pulse VFD may have a slightly higher initial investment compared to a 12 Pulse VFD. However, the long-term benefits in terms of energy savings, reduced maintenance and improved motor performance make it a more cost-effective option in the long run.

In conclusion, the cancellation of harmonics is indeed a significant factor in pulse selection. A 36 Pulse VFD offers several advantages over a 12 Pulse VFD, including improved power quality, precise control, reduced noise and vibrations, and long-term cost savings. I hope this information helps answer your questions.

Best,