公开(公告)号：US07421301B2

公开(公告)日：2008-09-02

申请号：US10933682

申请日：2004-09-03

申请人： Steven E. Schulz ,  Daniel L. Kowalewski

发明人： Steven E. Schulz ,  Daniel L. Kowalewski

IPC分类号： G05B11/28 ,  H02M1/14 ,  H02M5/275 ,  H02P7/06 ,  G05B15/00

CPC分类号： H04L25/4902 ,  H02M1/44 ,  H02M7/53873 ,  H02P21/22 ,  Y10S388/921

摘要： A control system and a method of using the same for an electric machine having a random number generating module generating a random number ranging from a first value to a second value, a multiplying module multiplying the random number and a sample rate to generate an random delay value; and a delay limiter module limiting the random delay value as a function of speed of the electric machine and generating a limited delay value.

摘要翻译： 一种控制系统及其使用方法，用于具有产生从第一值到第二值的随机数的随机数生成模块的电机，乘法模块将随机数乘以采样率以产生随机延迟 值; 以及限制随机延迟值作为电机速度的函数并产生有限延迟值的延迟限制器模块。

公开(公告)号：US20080197902A1

公开(公告)日：2008-08-21

申请号：US11676574

申请日：2007-02-20

申请人： Brian A. Welchko ,  Bonho Bae ,  Steven E. Schulz ,  Silva Hiti

发明人： Brian A. Welchko ,  Bonho Bae ,  Steven E. Schulz ,  Silva Hiti

IPC分类号： H03K3/017

CPC分类号： H03K3/017 ,  H02M7/5395 ,  H02M2001/0025 ,  H02P27/06

摘要： Methods and apparatus are provided for reducing voltage distortion effects at low speed operation in electric drives. The method comprises receiving a first signal having a duty cycle with a range between minimum and maximum achievable duty cycles, producing a second duty cycle based on the minimum achievable duty cycle if the duty cycle is within a distortion range and less than a first clipping value, producing a second duty cycle based on the closer of minimum and maximum pulse widths if the duty cycle is within the distortion range and between the first and a second clipping value, producing a second duty cycle based on the maximum achievable duty cycle if the duty cycle is within the distortion range and greater than the second clipping value, and transmitting a second signal to the voltage source inverter having the second duty cycle.

摘要翻译： 提供了用于在电驱动器中降低低速运行时的电压失真效应的方法和装置。 该方法包括接收具有在最小和最大可实现占空比之间的范围的占空比的第一信号，如果占空比在失真范围内并小于第一限幅值，则基于最小可实现占空比产生第二占空比 如果占空比在失真范围内，并且在第一和第二限幅值之间，则基于更小的最小和最大脉冲宽度产生第二占空比，如果占空比基于最大可实现的占空比，则产生第二占空比 循环处于失真范围内并且大于第二限幅值，并且将第二信号发送到具有第二占空比的电压源逆变器。

公开(公告)号：US07411801B2

公开(公告)日：2008-08-12

申请号：US11300249

申请日：2005-12-14

申请人： Brian Welchko ,  Steven E. Schulz ,  Silva Hiti

发明人： Brian Welchko ,  Steven E. Schulz ,  Silva Hiti

IPC分类号： H02M7/537

CPC分类号： H02M7/53871

摘要： Methods and apparatus are provided for modifying a pulse width modulation signal controlling a voltage source inverter. The method comprises the steps of determining a duty cycle of the signal, clipping the duty cycle when a modulation index is greater than a minimum modulation index and less than a maximum modulation index, clipping the duty cycle when the modulation index is greater than or equal to the maximum modulation index, and transmitting the duty cycle to the voltage source inverter. The minimum modulation index indicates a distortion range.

摘要翻译： 提供了用于修改控制电压源逆变器的脉宽调制信号的方法和装置。 该方法包括以下步骤：确定信号的占空比，当调制指数大于最小调制指数并小于最大调制指数时削减占空比，当调制指数大于或等于时限制占空比 到最大调制指数，并将占空比传送到电压源逆变器。 最小调制指数表示失真范围。

公开(公告)号：US20080183405A1

公开(公告)日：2008-07-31

申请号：US11668830

申请日：2007-01-30

申请人： Brian A. Welchko ,  Silva Hiti ,  Steven E. Schulz

发明人： Brian A. Welchko ,  Silva Hiti ,  Steven E. Schulz

IPC分类号： G01L3/00

CPC分类号： H02P23/14

摘要： In an embodiment of a method, the method includes measuring currents and voltages that are coupled to a motor that includes an internal permanent magnet and determining a reactive power in response to the measured currents and voltages. The method further includes estimating a first flux orthogonal to an axis of the internal permanent motor and estimating a second flux aligned with the axis of the internal permanent motor. Additionally, the method includes estimating a torque in response to the measured currents and the first and second fluxes.

摘要翻译： 在方法的实施例中，该方法包括测量耦合到包括内部永磁体的电动机的电流和电压，并响应于测量的电流和电压来确定无功功率。 该方法还包括估计与内部永久电动机的轴正交的第一通量，并估计与内部永久电动机的轴线对准的第二通量。 另外，该方法包括响应于测量的电流和第一和第二通量来估计转矩。

公开(公告)号：US20080116840A1

公开(公告)日：2008-05-22

申请号：US11561513

申请日：2006-11-20

申请人： Brian Welchko ,  Steven E. Schulz ,  Silva Hiti ,  Stephen T. West

发明人： Brian Welchko ,  Steven E. Schulz ,  Silva Hiti ,  Stephen T. West

IPC分类号： H02P27/04

CPC分类号： H02P27/06 ,  H02M7/53875 ,  H02M2007/53876 ,  H02P21/00

摘要： A method for controlling an inverter uses sequences of predetermined states where each state uniquely corresponding to a set of control signals provided to the inverter that is coupled to a motor. The method includes repeatedly applying a first center null timing sequence of the states while monitoring a zero crossing condition and then changing the repeated application of the first center null timing sequence of the states into a repeated application of a second center null timing sequence of states when the monitoring detects a zero crossing condition. The repeated application of the first center null timing sequence sequentially provides the inverter with a first predetermined sequence of sets of control signals. The monitoring of a zero crossing condition monitors for a zero crossing condition in an electrical current flowing between the inverter and a terminal of the motor. The second center null timing sequence defines a second predetermined sequence of sets of control signals.

摘要翻译： 用于控制逆变器的方法使用预定状态的序列，其中每个状态唯一对应于提供给耦合到电动机的逆变器的一组控制信号。 该方法包括在监视过零状态的同时重复地应用状态的第一中心零点定时序列，然后将状态的第一中心零点定时序列的重复应用改变为重复应用第二中心零点定时时序序列， 监控检测到过零状态。 重复应用第一中心零点定时序列顺序地向逆变器提供第一预定的一组控制信号。 过零状态的监视监视在逆变器和电动机的端子之间流动的电流中的过零状态。 第二中心零点定时序列定义了控制信号组的第二预定序列。

公开(公告)号：US07218071B1

公开(公告)日：2007-05-15

申请号：US11375429

申请日：2006-03-14

申请人： Brian Welchko ,  Steven E. Schulz ,  Silva Hiti

发明人： Brian Welchko ,  Steven E. Schulz ,  Silva Hiti

IPC分类号： H02P27/06

CPC分类号： H02P6/085 ,  H02P23/03 ,  H02P2209/07

摘要： Methods and apparatus are provided for controlling AC motor torque output. The method comprises the steps of producing a current based on a first comparison of a fundamental output frequency of the AC motor with a predetermined frequency and a second comparison of a magnitude of a commanded current with a predetermined DC current, and supplying the current to the AC motor.

摘要翻译： 提供了用于控制交流电动机转矩输出的方法和装置。 该方法包括以下步骤：基于交流电动机的基本输出频率与预定频率的第一比较以及指令电流的大小与预定直流电流的第二比较产生电流，并将电流提供给 交流电机。

公开(公告)号：US07015667B2

公开(公告)日：2006-03-21

申请号：US10808082

申请日：2004-03-24

申请人： Nitinkumar R. Patel ,  Steven E. Schulz

发明人： Nitinkumar R. Patel ,  Steven E. Schulz

IPC分类号： H02P7/00

CPC分类号： H02P21/08

摘要： A control system and method for an electric machine includes a first calculation module that receives a modified torque command and a calculated stator flux command and that generates first and second current commands and first and second voltage commands. A voltage magnitude calculation module generates a voltage magnitude based the first and second voltage commands. A reference voltage calculator module generates a reference voltage based on a DC link voltage, an angular stator velocity and the first and second current commands. A flux weakening module generates the calculated flux command based on the angular stator velocity, the reference voltage and the voltage magnitude.

摘要翻译： 一种用于电机的控制系统和方法包括：第一计算模块，其接收修改的转矩指令和计算的定子磁通指令，并产生第一和第二电流指令以及第一和第二电压指令。 电压幅度计算模块基于第一和第二电压命令产生电压幅度。 参考电压计算器模块基于DC链路电压，角定子速度和第一和第二电流命令产生参考电压。 磁通弱化模块基于角定子速度，参考电压和电压幅度产生计算的磁通指令。

公开(公告)号：US06841969B1

公开(公告)日：2005-01-11

申请号：US10669918

申请日：2003-09-24

申请人： Steven E. Schulz ,  Nitinkumar R. Patel

发明人： Steven E. Schulz ,  Nitinkumar R. Patel

IPC分类号： H02P21/14 ,  H02P6/18

CPC分类号： H02P21/13 ,  H02P21/24 ,  H02P2207/05

摘要： A control system includes a field oriented controller that receives a torque command and that generates phase voltages for an electric machine. A first transformation module receives stator terminal currents and generates d-axis and q-axis stationary frame currents. An open loop flux observer receives d-axis and q-axis stationary frame voltage commands and the d and q-axis stationary frame currents. The open loop flux observer includes a vector cross product calculator that generates an error signal that is proportional to an angular difference between an estimated stator flux and a computed stator flux and a proportional integral controller that generates an estimated rotor angular position based on the error signal. A second transformation module receives the d-axis and q-axis stationary frame currents and the estimated rotor angular position and generates d-axis and q-axis synchronous reference frame feedback currents that are output to the field oriented controller.

摘要翻译： 控制系统包括磁场定向控制器，其接收转矩指令并产生电机的相电压。 第一变换模块接收定子端电流并产生d轴和q轴静止的电流。 开环通量观测器接收d轴和q轴静止电压指令以及d轴和q轴静止电流。 开环通量观察器包括矢量交叉乘积计算器，其生成与估计的定子通量和计算出的定子通量之间的角度差成比例的误差信号，以及基于误差信号产生估计的转子角位置的比例积分控制器 。 第二变换模块接收d轴和q轴静止帧电流和估计的转子角位置，并产生输出到磁场定向控制器的d轴和q轴同步参考帧反馈电流。

公开(公告)号：US06646407B2

公开(公告)日：2003-11-11

申请号：US09877634

申请日：2001-06-08

申请人： Khwaja M. Rahman ,  Steven E. Schulz

发明人： Khwaja M. Rahman ,  Steven E. Schulz

IPC分类号： H02P705

CPC分类号： H02P25/098 ,  H02P25/092

摘要： A controller for use in a switched reluctance (SR) motor drive is provided. The controller includes a DC—DC converter coupled to an inverter. The DC—DC converter can be a buck converter, a boost converter, or a buck-boost converter. The control parameters to the DC—DC converter can be optimal. In addition, the bus voltage of the motor drive can be reduced to a level such that the motor operates in single pulse mode. A capacitor can be connected in parallel across the outputs of the DC—DC converter supplying the inverter. Using the DC—DC converter to indirectly profile the phase current can reduce motor torque ripple.

公开(公告)号：US06359413B1

公开(公告)日：2002-03-19

申请号：US09560339

申请日：2000-04-28

申请人： Steven E. Schulz ,  Khwaja M. Rahman

发明人： Steven E. Schulz ,  Khwaja M. Rahman

IPC分类号： H02P700

CPC分类号： H02P25/08 ,  H02P25/0925

摘要： A current control system for a switched reluctance motor that eliminates the effects of back EMF produced by such motor on the current control loop. The control system includes a current regulator that receives a current reference signal indicative of the desired output of the motor and a motor current signal indicative of the current in at least one phase winding of the motor. The regulator produces an output signal in response to the difference between the current reference signal and the motor current signal. The output of the regulator is a duty cycle command. A back EMF decoupler provides a back EMF signal indicative of the back EMF created by the motor and adds the back EMF signal to the current regulator output signal to provide a back EMF decoupled duty cycle command signal. An inverter circuit switches on and off the voltage to at least one phase winding of the motor in accordance with the back EMF decoupled duty cycle command signal to control the motor current and operate the motor.

摘要翻译： 一种用于开关磁阻电动机的电流控制系统，其消除了由电动机产生的反电动势对电流控制回路的影响。 控制系统包括电流调节器，其接收指示电动机的期望输出的电流参考信号和指示电动机的至少一个相绕组中的电流的电动机电流信号。 调节器响应于当前参考信号和电动机电流信号之间的差异产生输出信号。 调节器的输出是占空比指令。 反向EMF解耦器提供表示由电动机产生的反电动势的反向EMF信号，并将反电动势信号加到电流调节器输出信号上以提供反电动势解耦占空比指令信号。 逆变器电路根据反电动势去耦占空比指令信号将电压接通和断开至电动机的至少一相绕组，以控制电动机电流并操作电动机。