|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||318/801 ; 318/811 ; 318/732 ; 318/798 ; 600/608 ; 290/052|
|발명자 / 주소|
|출원인 / 주소|
|대리인 / 주소||
|인용정보||피인용 횟수 : 30 인용 특허 : 15|
A prime mover such as a microturbine generator is operated to generate dc power, and an inverter is controlled to convert the dc power to ac power. The ac power is supplied to an electric motor. The frequency of the ac power is ramped up during motor startup to reduce motor inrush current. The frequency or current of the ac power may be varied in response to process requirements during normal operation of the motor.
[ What is claimed is:] [1.] A system comprising:an electric motor;a prime mover for generating dc electrical power;an inverter for converting the dc power to ac power, the ac power being supplied to the electric motor during motor operation; anda controller for controlling the inverter to ramp up current of the ac power and ramp up frequency of the ac power during startup of the electric motor, the frequency being ramped up after the current has been ramped up, the current and the frequency being ramped up to reduce motor inrush current.