发明名称 |
Phase detector, motor drive controller, motor device, and method of detecting phase of rotor |
摘要 |
A phase detector includes a crossing-point phase detection circuit to compare signals levels of pairs of sensor signals and output crossing-point phase detection signals indicating phases of crossing points between the pairs of the sensor signals, each having a signal level corresponding to a rotational position of a rotor of a motor having coils, a crossing-point level detection circuit to output crossing-point level signals indicating crossing-point levels detected, a signal selection circuit to select one of the sensor signals as a selection signal, a phase detection circuit to detect that a signal level of the selection signal has reached a threshold level, and output a phase data signal indicating a phase of the rotor corresponding to the threshold level, and an in-phase level adjustment circuit to adjust and output in-phase levels of the sensor signals to approach each of the crossing-point levels to a predetermined signal level. |
申请公布号 |
US9515587(B2) |
申请公布日期 |
2016.12.06 |
申请号 |
US201514633794 |
申请日期 |
2015.02.27 |
申请人 |
RICOH COMPANY, LTD. |
发明人 |
Kamatani Tomohiko |
分类号 |
H02P6/06;H02P6/16;G01D5/14;H02P6/18 |
主分类号 |
H02P6/06 |
代理机构 |
Cooper & Dunham LLP |
代理人 |
Cooper & Dunham LLP |
主权项 |
1. A phase detector, comprising:
a crossing-point phase detection circuit to compare signal levels of respective pairs of multiple sensor signals and output crossing-point phase detection signals indicating phases of crossing points between the respective pairs of the sensor signals, each of the sensor signals having a signal level corresponding to a rotational position of a rotor of a motor having multiple coils; a crossing-point level detection circuit to detect crossing-point levels indicating signal levels of the crossing points between the respective pairs of the sensor signals and output multiple crossing-point level signals indicating the crossing-point levels detected; a signal selection circuit to select one of the sensor signals as a selection signal; a phase detection circuit to detect that a signal level of the selection signal has reached a threshold level, and output a phase data signal indicating a phase of the rotor corresponding to the threshold level which the signal level has reached; and an in-phase level adjustment circuit to adjust and output in-phase levels of the sensor signals to approach each of the crossing-point levels to a predetermined signal level. |
地址 |
Tokyo JP |