Based on the results of the first week, we found the following information:
First, we found that we could use a synchronous motor as a generator, consider its advantages and disadvantages
The main advantage of HSPMTCs is their minimal length of the winding end-turn and accordingly the minimum overall dimensions of the entire electric machine at the maximum energy density, in comparison with other types of electric machines. In addition, HSPMTC can effectively implement the technology of oil-free small gas turbine engines, which are particularly effective in aerospace engineering.
Since the HSPMTC is operated at increased rotor speeds, there are a number of technical problems arising during their operation and design. These problems include eddy currents losses in permanent magnets, losses in the stator magnetic core, and also friction in bearing assemblies.
Moreover, hysteresis and eddy currents losses in the stator magnetic core significantly increase due to the high frequency of magnetization reversal of the stator magnetic core, which is 28-30% for HSPMTC. This value of hysteresis and eddy current losses is very significant and reduces the efficiency of HSPMTC use in industries.
We are not sure about suitable it is in our project or not, but at least we can try to use it in the model.
We found the first issue connected to motors – loses (coils materials):
Increasing energy efficiency
One of the ways to increase the energy efficiency of HSPMTC is to minimize hysteresis and eddy currents losses in the HSPMTC stator magnetic core by using amorphous magnetic material (AMM). AMM has very low specific losses, in comparison with electrical steel or cobalt alloys. The use of amorphous alloy makes it possible to reduce the hysteresis and eddy currents losses in the stator iron 4-5 times. Taking into account that hysteresis and eddy current losses make up to 30% of the total losses in HSPMTC, their minimization significantly increases the efficiency of the machine.
There is the second issue connected to the inverter – not enough speed of transistors switching
Typical inverters are working on the base of the pulse wide modulation method, where a continuous switching of voltage or current controls the output waveform. Due to the need for faster high-speed generators, the switching frequency increases as well (in modern inverters, IGBT’s are used). Although noise and efficiency improvements as the number of pulses increase, the inverter leads also to a few drawbacks, especially because of fast switching transients which can be understood as a significant source of stray losses.