公开(公告)号：US11476784B1

公开(公告)日：2022-10-18

申请号：US17371409

申请日：2021-07-09

Applicant: Allegro MicroSystems, LLC

Inventor： Masahira Kurihara ,  Dmytro Sakharov ,  Anton Babushkin

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.

公开(公告)号：US11658597B1

公开(公告)日：2023-05-23

申请号：US17645118

申请日：2021-12-20

Applicant: Allegro MicroSystems, LLC

Inventor： Anton Babushkin ,  Serhii Korol ,  Yaroslav Smirnov ,  Dmytro Sakharov ,  Masahira Kurihara ,  Kamyar Khosravi ,  Vadym Khudobets

IPC: H02P23/14 ,  G01R29/02 ,  H02P29/00

CPC classification number: H02P23/14 ,  G01R29/02 ,  H02P29/00

Abstract: A method comprising: receiving a first current measurement that is taken at a first predetermined time instant; receiving a second current measurement that is taken at a second predetermined time instant; classifying the first current measurement as corresponding to one of a plurality of electrical signals, the first current measurement being classified based, at least in part, on a duty cycle pattern of the plurality of electrical signals; classifying the second current measurement as corresponding to another one of the plurality of electrical signals, the second current measurement being classified based, at least in part, on the duty cycle pattern of the plurality of electrical signals; and adjusting a duty cycle of at least one of the electrical signals based on the first current measurement, the classification of the first current measurement, the second current measurement, and the classification of the second current measurement.

公开(公告)号：US20240291415A1

公开(公告)日：2024-08-29

申请号：US18173236

申请日：2023-02-23

Applicant: Allegro MicroSystems, LLC

Inventor： Serhii Korol ,  Anton Babushkin ,  Dmytro Sakharov ,  Oleksii Dudnyk

IPC: H02P27/08 ,  H02P21/00 ,  H02P21/22 ,  H02P21/34

CPC classification number: H02P27/08 ,  H02P21/22 ,  H02P21/34 ,  H02P21/50

Abstract: Methods and apparatus for controlling a three-phase electric motor by determining a duration of current measurement windows within a first pulse width modulation period for measuring motor current using a single shunt coupled to the motor. A duration of a first one of the current measurement windows can be adjusted by a time delta value to meet a minimum time to measure the motor current. A next PWM period can include compensation for the time delta value. In embodiments window adjustments are made by modifying the high state of a middle phase signal for phase signals to switches that energize the motor.

公开(公告)号：US20230409006A1

公开(公告)日：2023-12-21

申请号：US17807203

申请日：2022-06-16

Applicant: Allegro MicroSystems, LLC

Inventor： Serhii Korol ,  Anton Babushkin ,  Vadym Khudobets ,  Oleksii Dudnyk

IPC: G05B19/4155 ,  H02P23/14

CPC classification number: G05B19/4155 ,  G05B2219/41321 ,  H02P23/14

Abstract: Methods and apparatus for compensating for non-sinusoidal BEMF signals in an electrical motor using amplitudes, phases and orders of BEMF harmonic components and amplitude of 1st harmonic of BEMF of the electrical motor. First and second corrective components for vd and vq of the d-q coordinate system for the motor can be generated from amplitudes of the BEMF harmonic components and the angles of the BEMF harmonic components orders of the BEMF harmonic components and amplitude of 1st harmonic of BEMF.