{
  "$type": "site.standard.document",
  "description": "An AC rotary electric machine (M) such as a starter motor rotates synchronously with the crankshaft and is provided with a rotor in which S-pole and N-pole permanent magnets (60) are arranged circumferentially, and with first, second, and third magnetic sensors (61) that detect a magnetization…",
  "path": "/patents/1415277",
  "publishedAt": "2023-10-18T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "F02D41/0097",
    "HONDA MOTOR CO LTD [JP]"
  ],
  "textContent": "An AC rotary electric machine (M) such as a starter motor rotates synchronously with the crankshaft and is provided with a rotor in which S-pole and N-pole permanent magnets (60) are arranged circumferentially, and with first, second, and third magnetic sensors (61) that detect a magnetization boundary between the permanent magnets. The sensors are arranged that they provide phase shifted signal edges in response to the passing of the magnetization boundaries. A clocking means (51a, 51b, and 51c) counts a first elapsed time from detection of a particular magnetization boundary by a first magnetic sensor (61a) to detection by a second magnetic sensor (61b), a second elapsed time from detection of the magnetization boundary by the second magnetic sensor (61b) to detection by a third magnetic sensor (61c), and a third elapsed time from detection of the magnetization boundary by the third magnetic sensor (61c) to detection of the next boundary by the first magnetic sensor (61a). A moving average calculating means (52) calculates the crank angular velocity based on a moving average of the first, second, and third elapsed times, which only depends on the duration of a cycle of the signal generated by a respective one of the three magnetic sensors.",
  "title": "CRANK ANGULAR VELOCITY MEASURING DEVICE AND MISFIRE DETECTION DEVICE"
}