ニシテイ List of Products and Services

A sine wave filter can suppress the "surge voltage," which tends to be a problem with inverter drives, but what exactly is a "sine wave filter"? We often receive this question. This document thoroughly explains what a "sine wave filter (SWF)" is, its effects, circuit configuration, components used, applications, practical examples, and more! We will resolve your "unknowns" about sine wave filters! Additionally, Nishitei can assist with power quality issues in inverter operating environments. For more details, please download the PDF or contact us.

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Nishitei Co., Ltd. began developing metal resistors in 1953 and has been dedicated to this field ever since. Since obtaining a patent for the "V Series Resistor Elements" in 1965, we have received positive feedback from major heavy electrical and machinery manufacturers, resulting in long-term adoption of our products. We have also adapted to the diversification and changes in customer needs, such as the increase in demand for resistors and the emergence of inverters. In recent years, we have entered new business areas beyond resistors, including wire harnesses for robots and power quality improvement devices such as harmonic suppression filters and sine wave filters, in response to the widespread adoption of inverters. 【Products Offered】 ■ Resistors ■ Harmonic Filters ■ Sine Wave Filters ■ Capacitors for Motor Power Factor Improvement ■ Reactors and Transformers ■ Space Heaters ■ Wire Harnesses *For more details, please refer to the PDF document or feel free to contact us.

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• Other electronic parts

When installing factories, buildings, or other equipment that generates harmonics, the "Guidelines for Harmonic Suppression Measures for Customers Receiving Power at High or Special High Voltage" have been established by the Nuclear Safety and Security Agency, a special agency of the Ministry of Economy, Trade and Industry. However, what kind of impact do "harmonics," which affect electrical equipment within factories and flow out from the receiving end to impact nearby electrical equipment, actually have? Do you know what "harmonics" are, why they occur? This document explains what "harmonics" are, why they occur, what effects they have, and the contents of the harmonic suppression measures guidelines. If you are interested, please download the PDF or contact us! Additionally, Nishitei will be exhibiting at the 67th Electrical Engineering Industry Exhibition JECA FAIR 2019. If you have any questions regarding harmonics or countermeasures, please feel free to consult with us at the venue! Event Dates: May 22-24, 2019 Venue: Tokyo Big Sight, West Hall 1 & 2 Booth Number: West Hall 2, 2-011

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When installing factories, buildings, or other equipment that generates harmonics, the "Guidelines for Harmonic Suppression Measures for Customers Receiving Power at High Voltage or Special High Voltage" have been established by the Nuclear and Industrial Safety Agency, a special agency of the Ministry of Economy, Trade and Industry. However, what kind of effects do "harmonics," which affect electrical equipment within factories and flow out from the receiving end to impact nearby electrical devices, actually have? Do you know what "harmonics" are, why they occur? This document explains what "harmonics" are, why they occur, what effects they have, and the contents of the harmonic suppression measures guidelines. If you are interested, please download the PDF or contact us!

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The Ministry of Economy, Trade and Industry's Agency for Natural Resources and Energy has issued the "Guidelines for Harmonic Suppression Measures for High Voltage or Extra High Voltage Customers" from the Nuclear and Industrial Safety Agency, which is a special agency. This applies to factories, buildings, and other locations where inverters are used. However, what kind of impact do "harmonics," which affect electrical equipment within factories and flow out from the receiving end to impact nearby electrical equipment, actually have? First of all, do you know what "harmonics" are and why they occur? This document explains what "harmonics" are, why they occur, what effects they have, and details the harmonic suppression measures guidelines. If you are interested, please download the PDF or contact us!

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The "SWF Series" is a sine wave filter suitable for general-purpose inverters to convert the inverter output voltage into a sine wave. SWF converts the PWM-controlled rectangular output voltage waveform into a sine wave through high-speed switching of the IGBT in the inverter section. This suppresses surge voltage and ensures the long lifespan of motors. Our company provides comprehensive support for sine wave generation of inverter output voltage! We can accommodate various requests. - Estimates available for power supply voltages in the 200V class - Estimates available for inverter carrier frequencies of 2kHz - Estimates available for motor operating frequencies of 60Hz and above [Features] - Suppresses surge voltage applied to the motor - Reduces ripple in the inverter output voltage waveform and converts it to a sine wave - Achieves long motor lifespan by suppressing surge voltage Leave the support for sine wave generation to us. *For more details, please refer to the PDF document or feel free to contact us.

• Inverter

The "SWF Series" solves issues such as surge voltage, shaft electrical erosion, and leakage current by converting the rectangular output voltage waveform of the inverter's PWM control waveform into a sine wave. To convert the PWM control waveform into a sine wave, high-frequency components such as carrier frequency are cut. This reduces surge voltage and contributes to the longevity of the motor. Additionally, it also reduces leakage current from cables. 【Features】 ■ Achieves longer motor lifespan ■ Supports long-distance cables ■ Standardized wide lineup ■ Corrects voltage distortion in the inverter output circuit *For more details, please refer to the PDF document or feel free to contact us.

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The "PHF Series" is a harmonic suppression filter that efficiently and cost-effectively reduces harmonics, which are a concern for users. It can easily meet the "Harmonic Suppression Measures Guidelines" required during new installations, expansions, or updates. By installing this product, the distortion of power voltage and current waveforms is significantly reduced, improving the total harmonic distortion rate to a single-digit level. 【Features】 ■ 90% reduction in harmonic current ■ Complies with harmonic suppression measures guidelines ■ Standardized wide lineup ■ Significantly reduces harmonic current distortion *For more details, please refer to the PDF materials or feel free to contact us.

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Harmonics generated by equipment can travel through power lines and cause abnormal noises, vibrations, burning, and malfunctions in other devices and equipment. When harmonics are generated, they can adversely affect electrical devices and circuits, so it is necessary to either install electrical equipment that does not generate harmonics or take measures to cancel out the generated harmonics. Harmonic suppression filters are passive filters that suppress harmonic currents to meet harmonic guideline measures. They primarily reduce the 5th and 7th harmonics, as well as up to the 25th harmonic. 【Features】 ■ Reduction of total harmonic distortion (THD-i) ■ Equivalent negative phase current (negative phase tolerance) ■ PHF (Harmonic Filter) *Please download the [PDF] to view the case studies.

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The "SWF Series" is a general-purpose sine wave filter suitable for sine wave shaping of inverter output voltage. SWF converts the PWM-controlled rectangular output voltage waveform into a sine wave through high-speed switching of the IGBT in the inverter section. This helps suppress surge voltage and achieve a longer lifespan for motors. We provide comprehensive support for sine wave shaping of inverter output voltage! We can accommodate various requests. - Estimates available for power supply voltages in the 200V class - Estimates available for inverter carrier frequencies of 2kHz - Estimates available for motor operating frequencies of 60Hz and above 【Features】 - Suppresses surge voltage applied to the motor terminals - Shapes inverter output voltage waveform into a sine wave - Achieves longer motor lifespan by suppressing surge voltage Leave the sine wave shaping support to us. *For more details, please refer to the PDF document or feel free to contact us.

• Inverter

This is a sine wave filter that utilizes low-pass filter technology to convert the pulse width modulation (PWM) output voltage of the SWF series inverter into a pure sine wave. You can view detailed usage examples from the PDF download. [Contents] - Example of installing one SWF for one inverter - Example of consolidating multiple motors with one SWF installation - Example of voltage transformation by converting the inverter output voltage waveform to a sine wave using the SWF *For more details, please refer to the PDF materials or feel free to contact us.

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The "SWF Series" suppresses surge voltage to approximately 650 to 800V when installed. Surge voltage occurs when the wiring to the load is long, typically reaching about twice the inverter's PN voltage (DC). By installing this product, dv/dt is suppressed, which in turn reduces the generated shaft voltage. Additionally, since it can suppress the carrier frequency components included in the inverter output voltage, surge voltage, and dv/dt, it can be addressed with a general-purpose inverter and general-purpose transformer, leading to reduced investment costs. 【Functions】 ■ Suppression of surge voltage ■ Suppression of shaft voltage (bearing electric corrosion) ■ Reduction of investment associated with voltage transformation *For more details, please refer to the PDF materials or feel free to contact us.

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The "SWF type" is a sine wave filter that utilizes low-pass filter technology to convert the pulse width modulation (PWM) output voltage of an inverter into a pure sine wave. This product eliminates the threat of excessive peak voltage and protects motor windings across all cable lengths, thereby ensuring a longer lifespan for the motor. Since it produces a nearly pure sine wave, it allows for virtually unlimited motor cable lengths. Additionally, if voltage drop becomes an issue due to long motor cables, boosting via a transformer is also possible. You can view the technical documentation for this product by downloading the PDF. 【Features】 ■ Solves voltage reflection and dv/dt issues ■ Flexible adaptability ■ Provides smooth operation and long lifespan for inverter-driven motors ■ Boosting via a transformer is also possible ■ Eliminates the threat of excessive peak voltage *For more details, please refer to the PDF documentation or feel free to contact us.

• Inverter

The "SWF Series" is a sine wave filter suitable for the sine wave shaping of inverter output voltage for general-purpose inverters. SWF converts the PWM-controlled rectangular output voltage waveform into a sine wave through high-speed switching of the IGBT in the inverter section. This suppresses surge voltage and achieves a longer lifespan for motors. We provide comprehensive support for the sine wave shaping of inverter output voltage. Leave the sine wave shaping support to us. 【Features】 ■ Suppresses surge voltage applied to the motor terminals ■ Converts inverter output voltage waveform into a sine wave ■ Achieves longer motor lifespan by suppressing surge voltage *For more details, please refer to the PDF document or feel free to contact us.

• Inverter

Harmonics generated by equipment can propagate through power lines and cause abnormal noises, vibrations, burning, and malfunctions in other devices and equipment. When harmonics occur, they can negatively impact electrical devices and circuits, so it is necessary to either install electrical equipment that does not generate harmonics or take measures to cancel out the generated harmonics. Harmonic suppression filters are passive filters that suppress harmonic currents to meet harmonic guideline measures. They primarily reduce the 5th and 7th harmonics, as well as up to the 25th harmonic. 【Features】 ■ Reduction of total harmonic distortion (THD-i) ■ Equivalent reverse phase current (reverse phase tolerance) ■ PHF (harmonic filter) *Please download the [PDF] to view the case studies.

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The "Power Harmonic Filter" is a PHF harmonic filter for inverters that suppresses the harmonics of the inverter input current and significantly improves the current waveform. It can reduce undesirable harmonics generated by equipment within the factory to a level that easily meets harmonic suppression guidelines, thereby resolving harmonic issues in the factory power distribution system. It is suitable for harmonic suppression measures for variable speed operations such as fans, compressors, and pumps driven by inverters, as well as high-torque operations requiring overload capacity, like conveyors. 【Features】 ■ Compliance with harmonic current suppression guidelines ■ Prevention of factory troubles caused by harmonics ■ Increased usable KVA of transformers due to the suppression of harmonic currents *For more details, please download the PDF or feel free to contact us.

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