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    METHOD AND APPARATUS FOR DETERMINING CHANGE IN MASS OF FAN IMPELLER
    1.
    发明申请
    METHOD AND APPARATUS FOR DETERMINING CHANGE IN MASS OF FAN IMPELLER 有权
    用于确定风扇叶轮质量变化的方法和装置

    公开(公告)号：US20130047724A1

    公开(公告)日：2013-02-28

    申请号：US13590708

    申请日：2012-08-21

    申请人： Jussi TAMMINEN ,  Tero Ahonen ,  Jero Ahola ,  Markku Niemelä

    发明人： Jussi TAMMINEN ,  Tero Ahonen ,  Jero Ahola ,  Markku Niemelä

    IPC分类号： G01P3/12

    CPC分类号： F04D27/001 ,  F04D25/06 ,  F04D25/08 ,  F04D29/703 ,  H02P21/143 ,  H02P23/14

    摘要： A method for determining a change in a mass of a fan impeller. The method includes inducing a torque to the fan impeller and determining a change in the angular speed of the fan impeller, induced by the torque. A value for a first parameter representing a present mass of the fan impeller is determined on the basis of the change in the angular speed and the torque. The change in the mass is then determined on the basis of the first parameter and a second parameter representing the reference mass of the fan impeller.

    摘要翻译： 一种用于确定风扇叶轮的质量变化的方法。 该方法包括向风扇叶轮诱导扭矩并确定由扭矩引起的风扇叶轮的角速度的变化。 基于角速度和转矩的变化来确定表示风扇叶轮的当前质量的第一参数的值。 然后基于第一参数和表示风扇叶轮的参考质量的第二参数来确定质量的变化。

    Stator flux estimate midpoint correction
    3.
    发明授权
    Stator flux estimate midpoint correction 失效

    公开(公告)号：US06600290B1

    公开(公告)日：2003-07-29

    申请号：US09913507

    申请日：2001-08-28

    申请人： Markku Niemelä

    发明人： Markku Niemelä

    IPC分类号： H02P764

    CPC分类号： H02P21/141 ,  H02P21/12 ,  H02P21/14 ,  H02P21/24

    摘要： A method of correcting the stator flux estimate midpoint in alternating-current systems, the method comprising the step of determining a stator flux estimate (&PSgr;s, est?). The method is characterized in steps of forming the sum of the squares of the rectangular components (&PSgr;sx, est?, &PSgr;sy, est?) of the stator flux estimate to obtain a reference variable (k), low-pass filtering the reference variable (k) in order to obtain a low-frequency component (kfilt) of reference variable, subtracting the low-frequency component (kfilt) from the reference variable (k) in order to obtain a difference variable (e), determining rectangular correction term components (&PSgr;sx, corr?, &PSgr;sy, corr?) of the stator flux estimate (&PSgr;s, est?) by multiplying the difference variable (e) by the rectangular components (&PSgr;sx, est?, &PSgr;sy, est?) of the stator flux and a correction coefficient (K&PSgr;corr), and forming a midpoint-corrected stator flux estimate (&PSgr;s, fin?) by adding the correction term components to the components of the stator flux estimate.

    Method of correcting flux midpoint in flux-controlled alternating current systems
    4.
    发明授权
    Method of correcting flux midpoint in flux-controlled alternating current systems 有权
    在通量控制交流系统中校正通量中点的方法

    公开(公告)号：US06335607B1

    公开(公告)日：2002-01-01

    申请号：US09647095

    申请日：2000-09-26

    申请人： Markku Niemelä

    发明人： Markku Niemelä

    IPC分类号： H02P2100

    CPC分类号： H02P21/12

    摘要： The invention relates to a method of correcting the flux midpoint in flux-controlled alternating current systems, the method comprising the steps of determining a stator flux estimate (&psgr;s,est) and determining the magnitude of stator current (is). The method is characterized by the steps of forming the scalar product between the stator flux estimate (&psgr;s,est) and the stator current (is) in order to obtain a reference variable (k), low-pass filtering the reference variable (k) in order to obtain a low-frequency component (kfilt) of the reference variable (k), subtracting the low-frequency component (kfilt) from the reference variable (k) in order to obtain a difference variable (e), determining correction term components (&psgr;s,x,corr, &psgr;s,y,corr) of the staror flux estimate (&psgr;s,est) by multiplying the difference variable (e) by the components (&psgr;s,x,est, &psgr;s,y,est) of the stator flux and correction coeficient (K&psgr;corr), and forming a stator flux (&psgr;s,fin) with a corrected midpooint on the basis of the components (&psgr;s,x,est, &psgr;s,y,est) of the stator flux estimate and correction term components (&psgr;s,x,corr, &psgr;s,y,corr).

    摘要翻译： 本发明涉及一种校正通量控制交流系统中的通量中点的方法，所述方法包括以下步骤：确定定子通量估计（psis，est）并确定定子电流的大小（is）。 该方法的特征在于以下步骤：在定子通量估计（psis，est）和定子电流（is）之间形成标量积，以获得参考变量（k），对参考变量（k）进行低通滤波， 为了获得参考变量（k）的低频分量（kfilt），从参考变量（k）中减去低频分量（kfilt）以获得差分变量（e），确定校正项 通过将差异变量（e）乘以组分（psis，x，est，psis，y，est），来分析主要通量估计（psis，est）的组分（psis，x，corr，psis，y，corr） 定子通量和校正系数（Kpsicorr），并且基于定子通量估计和校正项的分量（psis，x，est，psis，y，est）形成具有校正中点的定子通量（psis，fin） 组件（psis，x，corr，psis，y，corr）。

    Method for controlling an electrical machine and an inverter
    5.
    发明授权
    Method for controlling an electrical machine and an inverter 有权
    用于控制电机和逆变器的方法

    公开(公告)号：US06597148B1

    公开(公告)日：2003-07-22

    申请号：US09913348

    申请日：2001-09-13

    申请人： Markku Niemelä

    发明人： Markku Niemelä

    IPC分类号： H02P528

    CPC分类号： H02P21/12 ,  H02P21/30 ,  H02P23/30

    摘要： A method for controlling an electrical machine while it is connected to an inverter comprising phase-specific switching components generating an output voltage, an optimum switching table arranged to select a switching combination for the switching components on the basis of the stator flux and torque of the electrical machine, the method comprising steps of defining the stator current vector (is) of the electrical machine, and determining the rotation speed of the electrical machine. The method also comprises the step of defining a switching combination for the switching components on the basis of the stator current vector (is) and stator current reference vector (&psgr;s, ref) of the electrical machine when the determined rotation speed is lower than a predefined limit.

    摘要翻译： 一种用于在连接到包括产生输出电压的相位特定开关部件的逆变器的同时控制电机的方法，所述最佳切换表基于定子通量和转矩来选择开关部件的开关组合 电机，该方法包括以下步骤：定义电机的定子电流矢量，并确定电机的转速。 该方法还包括以下步骤：当所确定的转速低于预定义的速度时，基于电机的定子电流矢量（is）和定子电流参考矢量（psis，ref）定义用于开关部件的开关组合 限制。