Battery Simulators
When testing automotive system, bi-directional DC power is typically required by the inverter which operates the permanent magnet machine (PMM). This DC power supply replaces the function of the batteries in the vehicle so they are often referred to as battery simulators. They must have a greater capacity , both in generating and absorbing power, than the PMM themselves and are often very expensive . The cost results from their specialist nature and relatively low volume of manufacture.
Axes has worked with a major AC driver manufacturer to provide a cost effective solution to battery simulation as an integral part of the high speed PMM test systems which we have designed and commissioned. These variable voltage DC supplies are of two different formats depending on the range of voltage needed. Both are housed within the dynamometer inverter and recirculate power between the dynamometer and test machine, thus reducing electrical capacity requirements . When controlled by the automation systems supplied by Axes it is also possible to simulate specific battery function including internal impedance so that terminal voltage reflects the state of charge of a virtual battery model within the automation system.
Systems with DC Voltage ranges from 50 to 1000V DC with currents 
up to 800A have already been supplied.
Charge and Isolation Systems.
Again with automotive based test systems , a safe method of coupling and isolating power to the PMM inverter is needed. Axes designs these charge and isolation circuits and integrates them within an additional console of dynamometer inverter cabinet making for a bespoke drive solution for PMM testing.