NISHISHIBA ELECTRIC CO., LTD.

Electrical Power Systems for Various Use

As electrical power systems for various use, we offer frequency converters utilizing rotary machinery and, as rotary power generator application products, high-speed rotary machinery, load regeneration systems, and transmission testing devices.

Frequency converters

  • Frequency converters

To cater to special power supply needs such as test-condition power supply, factory power supply can be converted to the voltage and frequency needed to meet test requirements through the combination of a motor (and induction motor or a synchronous motor) and a synchronous generator.
Frequency converters can also handle parallel operation of several machines

Product features
Device combination Frequency Voltage
Induction motor (IM) – synchronous generator (SG) Fixed frequency
50 Hz ⇔ 60 Hz, etc.
Capable of handling both low and high voltage
Variability possible through magnetic field adjustment
Induction motor (IM) – synchronous generator (SG)
Variable speed control by inverter (INV)
Variable frequency
25 to 75 Hz, etc.
Capable of handling both low and high voltage
Variability possible through magnetic field adjustment
Synchronous motor (SM) – synchronous generator (SG)
Variable speed control by synchronous motor
Variable frequency
25 to 75 Hz, etc.
Capable of handling both low and high voltage
Variability possible through magnetic field adjustment

*Please consult with us regarding detailed specifications.

Relevant catalog
MG set [PDF/1.68MB]

Rotary machinery application systems

High-speed rotary machinery

  • High-speed rotary machinery

Permanent magnet generator (PMG) technology enables power generation with high-speed and low-speed drive machinery.

Product features
Device combination Application Features
Permanent magnet generator (PMG) +
AC/DC converter +
DC/AC inverter
For hydraulic, wind, and tidal power generation
(Low-speed/variable speed)
Accommodates low-speed rotation such as in natural energy power generation, etc.
Turbo charger
(High-speed/variable speed)
Accommodates high-speed rotation to over 10,000 revolutions.
Turbine engine
(Gearless, direct-connection, high-speed)
Accommodates high-speed rotation to over 10,000 revolutions.
Reciprocating engine
(Variable speed)
Accommodates fluctuating rotation

*Please consult with us regarding detailed specifications.

Load regeneration system

  • Load regeneration system

Energy released as heat due to water resistance and dry resistance can be effectively utilized through system regeneration.

Product features

  1. As with water resistance, load adjustment is possible.
  2. Power semiconductor device (IGBT) – Reduces the higher harmonics of input and output through inverter PMW control and filter circuit.
  3. A product lineup with single-unit capacity ranging from 7.5 kW to 630 kW.

*Please consult with us regarding detailed specifications.

Transmission testing devices

Through a combination of generator technology and drive technology, load testing and torque measuring of transmission, etc. can be carried out.

Product features

  1. Reduced power supply capacity through direct current regeneration.
  2. Low voltage system for easy handling.
  3. Size increase made possible through use of multi-winding rotary machinery.

*Please consult with us regarding detailed specifications.

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