Patent ID: 11913463
Assignee: TRANE INTERNATIONAL INC.
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 11:
12. A method of operating an electric power supply system for a compressor in a heat transfer circuit, the compressor including a permanent magnet electric motor, a driveshaft, and one or more gas bearing for supporting the driveshaft, the method comprising:
operating the electrical power supply system in a utility power mode, which includes:
a variable frequency drive (VFD) receiving utility power,
supplying electrical power from the VFD to the electric motor to rotate the driveshaft and compress working fluid, and
providing a flow of the compressed working fluid to the one or more gas bearings; and

operating the electrical power supply system in backup power mode during an interruption of the utility power, which includes:
supplying to a switch-mode power supply DC electrical power generated in the VFD by an electromotive force of the motor, and
utilizing, via the switch-mode power supply, the DC electrical power generated by the electromotive force to operate a backup gas supply to provide a flow of compressed working fluid to the one or more gas bearings, the backup gas supply including one or more of a second compressor, a vessel, a vessel with a heater, and a condenser valve.