Invention Grant
- Patent Title: Low acoustic noise open loop motor startup
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Application No.: US17371409Application Date: 2021-07-09
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Publication No.: US11476784B1Publication Date: 2022-10-18
- Inventor: Masahira Kurihara , Dmytro Sakharov , Anton Babushkin
- Applicant: Allegro MicroSystems, LLC
- Applicant Address: US NH Manchester
- Assignee: Allegro MicroSystems, LLC
- Current Assignee: Allegro MicroSystems, LLC
- Current Assignee Address: US NH Manchester
- Agency: Daly Crowley Mofford & Durkee, LLP
- Main IPC: H02P6/21
- IPC: H02P6/21 ; H02P6/182

Abstract:
Methods and apparatus for open loop startup of a three-phase motor that reduces acoustic noise. During rotor alignment of the motor, there is a maximum level for a phase current to the motor. After the rotor alignment, open loop motor startup is performed during which the phase current has a first slope. At a selected time, such as when a frequency of the phase current reaches a first threshold, the phase current transitions to a second slope.
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