Development of industry’s first water resistant surge suppressor by OKI
Micro-surge a phenomenon which occurs due to impedance mismatch of motor cable and the motor increases as the speed of inverter switching becomes faster and application of voltage increases to improve power efficiency. This can cause malfunctions in the motors. Such effects include insulation deterioration in motor coils, which damages the motor.
A conventional remedy to over come this issue is the insertion of LC filter circuits between the inverter and motor to slow down the surge rise on drive signal waveforms and dissipate the surge energy as heat. However, as the motor power increased it becomes necessary to use expensive and large-sized high-power-rated capacitors and coils resulting in a larger space requirement and increase in both price and power consumption.
To address this need, OKI Electric Cable made an announcement on development of the “eco Surge U” an ultra-small surge suppressor which was achieved as a result of applying transmission line theory. This is a theory that the characteristic of transmission lines (i.e. cables and wires) change depending on the frequency applied. The “eco Surge U” is one-fourth smaller and one-fifth lighter in comparison to conventional filters for 15kW motors and it can be used on 0.2kW up to 75kW motors. The newly developed sealed enclosure along with improved heat dissipation efficiency results in a water resistance surge suppressor. Unlike the conventional method which requires wiring in order to insert the filter between the inverter and the motor, the new “eco Surge U” is directly connected to the motor terminals. As a result of its water resistant sealed enclosure, the “eco Surge U” can be installed both in indoors and outdoors environment. Sale of the product will commence on September of this year according to OKI.
source
