I have encountered a three phase ac machine whose name plate contains following information: Y/360 V/90 Hz/2,3 A. I don't know whether it is an induction machine or permanent magnet synchronous machine. Is there any method how to distinguish between them? For example by connecting the machine to a three phase voltage source inverter? Thank you for any ideas.
There are two sub-categories;
SPMSM (surface permanent magnet synchronous motor)
IPMSM (interior permanent magnet synchronous motor)
Each serve different dynamic loads so that the torque-phase of the motor more closely resembles that of the load. Dynamic load vs phase can vary significantly between pumps and fans.
In 2015 Ingersoll Rand acquires FRIGOBLOCK.
A frequency converter changes the frequency of the electric voltage without changing the voltage. The refrigeration machine not only starts up in less time, an inverter-controlled refrigeration appliance can maintain the target temperature within closer limits with less energy. REF
Depending on number of pole pairs, perhaps RPM ranges from 500 to 2,000 rpm from 15 to 90Hz (guess)
Consider something like this.
You can't tell from that limited information, no. But if it WERE a PMAC motor, then the machine would HAVE TO have a VFD to operate it, you cannot just hook up 3 phase power to a PMAC motor and have it run. So if there is no VFD or Servo drive in the control panel, it's a squirrel cage induction motor.