{
  "$type": "site.standard.document",
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  "description": "A semiconductor device for driving an electric motor is provided. The semiconductor device includes: an original drive signal generator that generates an original drive signal, based on a positional signal which indicates a relative position of a first drive member and a second drive member of the…",
  "path": "/patents/1016306",
  "publishedAt": "2011-01-26T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "H02P25/22",
    "SEIKO EPSON CORP [JP]"
  ],
  "textContent": "A semiconductor device for driving an electric motor is provided. The semiconductor device includes: an original drive signal generator that generates an original drive signal, based on a positional signal which indicates a relative position of a first drive member and a second drive member of the electric motor; an excitation ratio signal generator that generates an excitation ratio signal which indicates a ratio of excitation interval to non-excitation interval of coils of the electric motor, based on a speed signal indicating a relative speed of the first drive member and the second drive member of the electric motor; an excitation interval signal generator that generates a binary excitation interval signal which specifies the excitation interval and the non-excitation interval of the coils of the electric motor, based on the positional signal and the excitation ratio signal; and a mask circuit that generates a drive signal for driving the electric motor by masking part of the original drive signal based on the excitation interval signal.",
  "title": "Drive control circuit for electric motor"
}