Invention Grant
- Patent Title: Magnetic pole position detection device
-
Application No.: US17801848Application Date: 2021-02-22
-
Publication No.: US12126287B2Publication Date: 2024-10-22
- Inventor: Kenji Takahashi , Tomohisa Tsutsumi
- Applicant: Fanuc Corporation
- Applicant Address: JP Yamanashi
- Assignee: Fanuc Corporation
- Current Assignee: Fanuc Corporation
- Current Assignee Address: JP Yamanashi
- Agency: Buchanan Ingersoll & Rooney PC
- Priority: JP 20030955 2020.02.26
- International Application: PCT/JP2021/006645 2021.02.22
- International Announcement: WO2021/172275A 2021.09.02
- Date entered country: 2022-08-24
- Main IPC: H02P6/185
- IPC: H02P6/185 ; H02P6/18 ; H02P6/20 ; H02P21/18 ; H02P25/026

Abstract:
Provided is a magnetic pole position detection device with which it is possible to shorten the detection time of the initial magnetic pole position of the rotor of a synchronous motor. A magnetic pole position detection device that detects the magnetic pole position of the rotor of the synchronous motor, the magnetic pole position detection device comprising an excitation command unit that excites the synchronous motor while changing the current phase of the excitation current from a preset initial value, and a torque zero determination unit that determines whether the torque generated by the rotor has reached zero, the excitation command unit: continuously executing an operation for exciting the synchronous motor using, as the current phase of the excitation current, a value obtained with a subtraction process for subtracting, from the initial value, a phase angle corresponding to the cumulative value of the movement amount of the rotor from the starting point of excitation at the initial value of the current phase, during the period after the synchronous rotor was excited at the initial value of the current phase until the torque is determined to have reached zero; and acquiring, as the magnetic pole initial position, the value obtained with the subtraction process when the torque is determined to have reached zero.
Public/Granted literature
- US20230109908A1 MAGNETIC POLE POSITION DETECTION DEVICE Public/Granted day:2023-04-13
Information query