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公开(公告)号：US20170310249A1
公开(公告)日：2017-10-26
申请号：US15496518
申请日：2017-04-25
Applicant: Dyson Technology Limited
Inventor： Libo ZHENG , Min ZHANG
Abstract: A method is described for controlling an electric motor having a rotor. The method is carried out after a shutdown of the motor has been initiated. The method includes starting a timer in a motor controller, performing regenerative braking to recapture kinetic energy from the rotor as electrical energy, and using the recaptured electrical energy from the regenerative braking to power the motor controller. If the timer in the motor controller exceeds a predetermined timer value, a flag is set in memory in the motor controller to indicate that the motor has stopped.
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公开(公告)号：US20170170758A1
公开(公告)日：2017-06-15
申请号：US15376304
申请日：2016-12-12
Applicant: Dyson Technology Limited
Inventor： Christopher John BATEMAN , Libo ZHENG
CPC classification number: H02P6/18 , G01R31/346 , H02P6/20 , H02P6/22 , H02P27/06
Abstract: A method of determining the parked position of a rotor of a permanent-magnet motor, including applying a first voltage to a phase winding of the motor, measuring a first parameter, removing the first voltage, waiting for current in the phase winding to decrease to zero, applying a second voltage having the opposite polarity, measuring a second parameter, comparing the first parameter and the second parameter, and determining that the rotor is in a first parked position if the first parameter is less than the second parameter, and that the rotor is in a second parked position if the first parameter is greater than the second parameter. The first parameter and the second parameter each correspond to one of (i) the time taken for current in the phase winding to exceed a threshold, and (ii) the magnitude of current in the phase winding at the end of a time interval.
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公开(公告)号：US20170310255A1
公开(公告)日：2017-10-26
申请号：US15496582
申请日：2017-04-25
Applicant: Dyson Technology Limited
Inventor： Libo ZHENG
Abstract: A method of determining the position of a rotor of a brushless permanent-magnet motor is provided. The phase winding is freewheeled when a phase current exceeds an upper threshold. The method further includes measuring a parameter that corresponds to either: (i) the magnitude of the phase current during or at the end of freewheeling when the phase winding is freewheeled for the fixed period of time, or (ii) the time interval between the start and end of freewheeling or the start and end of excitation when the phase winding is freewheeled until the phase current falls below the lower threshold. The measured parameter is then used to define a saturation threshold. The phase winding is subsequently excited and freewheeled in the same manner, and the parameter is measured again. The method then compares the measured parameter against the saturation threshold, and determines that the rotor is at a predetermined position.
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公开(公告)号：US20150008855A1
公开(公告)日：2015-01-08
申请号：US14321437
申请日：2014-07-01
Applicant: Dyson Technology Limited
Inventor： Libo ZHENG , Yongji ZHOU , Tuncay CELIK
IPC: H02P6/00
CPC classification number: H02H7/08 , H02M1/32 , H02M1/36 , H02M7/5387 , H02P6/085 , H02P29/0241
Abstract: A controller for a brushless motor that is configured to operate in normal mode or under-voltage mode. When operating in normal mode, the controller generates control signals for exciting a winding of the motor, monitors the magnitude of an input voltage, and switches to under-voltage mode in the event that the input voltage drops below an under-voltage threshold. When operating in under-voltage mode, the controller suspends excitation of the winding, monitors the magnitude of the input voltage, monitors the magnitude of a supply voltage used to power the controller, switches to normal mode in the event that the input voltage exceeds a restart threshold, and resets itself in the event that the supply voltage drops below a brown-out threshold.
Abstract translation: 用于无刷电动机的控制器，其被配置为在正常模式或欠压模式下操作。 当在正常模式下工作时，控制器产生用于激励电动机的绕组的控制信号，监视输入电压的大小，并且在输入电压降到低于欠电压阈值的情况下切换到欠电压模式。 当在欠电压模式下工作时，控制器暂停绕组的激励，监视输入电压的大小，监视用于为控制器供电的电源电压的大小，在输入电压超过 重新启动阈值，并在电源电压低于欠压阈值的情况下自行复位。
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公开(公告)号：US20170310256A1
公开(公告)日：2017-10-26
申请号：US15496553
申请日：2017-04-25
Applicant: Dyson Technology Limited
Inventor： Libo ZHENG
IPC: H02P6/28
CPC classification number: H02P6/28 , H02P6/185 , H02P2205/01
Abstract: A method of controlling a brushless permanent-magnet motor that includes sequentially exciting and freewheeling a phase winding of the motor is provided. The phase winding is freewheeled when the phase current exceeds an upper threshold. The method further includes measuring a parameter that corresponds to either: (i) the magnitude of the phase current during or at the end of freewheeling when the phase winding is freewheeled for the fixed period of time, or (ii) the time interval during freewheeling or during excitation when the phase winding is freewheeled until the phase current falls below the lower threshold. The measured parameter is then compared against a saturation threshold, and the rotor is determined to be at a predetermined position. In response to determining that the rotor is at the predetermined position, the phase winding is commutated after a commutation period has elapsed.
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Patent Agency Ranking
公开(公告)号：US20140366286A1
公开(公告)日：2014-12-18
申请号：US14304619
申请日：2014-06-13
Applicant: Dyson Technology Limited
Inventor： Libo ZHENG , Yongji ZHOU , James Douglas CHISHOLM , David John HAWKER
CPC classification number: A47L11/4011 , A47L9/2831 , A47L9/2847 , A47L9/2857 , A47L11/4008 , A47L11/4069
Abstract: A surface cleaning appliance having a cleaner head that includes an agitator and a motor for driving the agitator. The appliance includes a switch coupling the motor to a supply voltage, a voltage sensor for measuring the magnitude of the supply voltage, a current sensor for measuring the magnitude of current through the motor, and a controller configured to output a PWM signal for controlling the switch. The controller then adjusts the duty cycle of the PWM signal in response to changes in the supply voltage and in response to changes in the current through the motor.
Abstract translation: 一种具有清洁器头部的表面清洁器具，其包括搅拌器和用于驱动搅拌器的马达。 该器具包括将电动机耦合到电源电压的开关，用于测量电源电压大小的电压传感器，用于测量通过电动机的电流的大小的电流传感器，以及控制器，被配置为输出PWM信号， 开关。 然后，控制器响应于电源电压的变化并响应于通过电动机的电流的变化来调整PWM信号的占空比。
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公开(公告)号：US20220014125A1
公开(公告)日：2022-01-13
申请号：US17294774
申请日：2019-10-16
Applicant: Dyson Technology Limited
Inventor： Neil William HODGINS , Libo ZHENG
Abstract: A method of controlling a brushless permanent magnet motor includes determining a motor operating target. The method includes comparing the motor operating target to a set of pre-determined excitation timing parameter relationships. The method includes operating the motor in accordance with an excitation timing parameter relationship determined from the set of pre-determined excitation timing parameter relationships to provide a motor operating response close to the motor operating target. The method includes measuring a measured motor operating response, comparing the measured motor operating response to the motor operating target, and applying a correction factor to an excitation timing parameter of the motor when the measured motor operating response does not match the motor operating target, such that the measured motor operating response moves toward the motor operating target.
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公开(公告)号：US20140368138A1
公开(公告)日：2014-12-18
申请号：US14304658
申请日：2014-06-13
Applicant: Dyson Technology Limited
Inventor： Tuncay CELIK , Libo ZHENG
IPC: H02P6/14
Abstract: A method of controlling a brushless permanent-magnet motor. The method includes dividing each half of an electrical cycle of the motor into a conduction period followed by a primary freewheel period. The conduction period is then divided into a first excitation period, a secondary freewheel period, and a second excitation period. The method then involves exciting a winding of the motor during each excitation period and freewheeling the winding during each freewheel period. The secondary freewheel period has a position and length within the conduction period that acts to reduce the harmonic content of current in the winding relative to back EMF in the winding. As a result, the efficiency of the motor is improved.
Abstract translation: 一种控制无刷永磁电动机的方法。 该方法包括将电动机的电循环的每一半分成导通周期，随后是初级续流周期。 然后将导通时段分为第一激励周期，次级续流周期和第二激励周期。 该方法然后包括在每个激励期间激励电动机的绕组，并且在每个续流期间续航绕组。 次级续流时段具有在导通周期内的位置和长度，用于减小绕组中相对于绕组中的反电动势的电流的谐波含量。 结果，提高了电动机的效率。
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公开(公告)号：US20220190751A1
公开(公告)日：2022-06-16
申请号：US17685258
申请日：2022-03-02
Applicant: Dyson Technology Limited
Inventor： Libo ZHENG , Min ZHANG
Abstract: A method is described for controlling an electric motor having a rotor. The method is carried out after a shutdown of the motor has been initiated. The method includes starting a timer in a motor controller, performing regenerative braking to recapture kinetic energy from the rotor as electrical energy, and using the recaptured electrical energy from the regenerative braking to power the motor controller. If the timer in the motor controller exceeds a predetermined timer value, a flag is set in memory in the motor controller to indicate that the motor has stopped.
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公开(公告)号：US20140368141A1
公开(公告)日：2014-12-18
申请号：US14304599
申请日：2014-06-13
Applicant: Dyson Technology Limited
Inventor： Libo ZHENG , Yongji ZHOU , Tuncay CELIK
IPC: H02P6/14
Abstract: A method of controlling a brushless permanent-magnet motor. The method includes commutating a winding of the motor at times relative to zero-crossings of back EMF in the winding. Commutation is then advanced when the motor operates over a first speed range, and commutation is retarded when the motor operates over a second speed range higher than that of the first speed range.
Abstract translation: 一种控制无刷永磁电动机的方法。 该方法包括相对于绕组中反电动势的过零点的时间将电动机的绕组换向。 当马达在第一速度范围内运行时，换向被提升，当马达在高于第一速度范围的第二速度范围内运行时换向延迟。
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