{
  "$type": "site.standard.document",
  "description": "It is an object to obtain a heat pump device that can efficiently feed a high-frequency current to an electric motor and effectively heat a compressor. The heat pump device includes a compressor 1 including a compression mechanism 7 configured to compress a refrigerant and a motor 8 configured to…",
  "path": "/patents/975945",
  "publishedAt": "2014-04-23T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B60H1/143",
    "MITSUBISHI ELECTRIC CORP [JP]"
  ],
  "textContent": "It is an object to obtain a heat pump device that can efficiently feed a high-frequency current to an electric motor and effectively heat a compressor. The heat pump device includes a compressor 1 including a compression mechanism 7 configured to compress a refrigerant and a motor 8 configured to drive the compression mechanism 7, heat exchangers, an inverter 9 configured to apply a voltage to the motor 8, and an inverter control unit 11 configured to drive the inverter 9. The inverter control unit 11 includes a stagnation detecting unit 12 configured to determine whether heating of the compressor 1 is necessary and notify the determination result and a high-frequency-alternating-current-voltage generating unit 13 and a PWM-signal generating unit 15 configured to shift to a heating operation mode when the heating is necessary and, in the heating operation mode, generate PWM signals to provide, based on a heating time carrier signal having two or more frequencies, a period in which a reflux current flows.",
  "title": "HEAT PUMP DEVICE, AIR CONDITIONER, AND REFRIGERATOR"
}