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    • 72. 发明公开
    • CONTROLLER FOR ELECTRICAL MACHINES
    • 控制电机用
    • EP2359467A2
    • 2011-08-24
    • EP09755893.6
    • 2009-11-17
    • Technelec Ltd
    • POLLOCK, CharlesPOLLOCK, Helen
    • H02P6/18H02P23/12H02P23/14
    • H02P6/18H02P21/18H02P21/24
    • The present invention relates to control of electrical machines and in particular, though not exclusively, to control of synchronous machines such as hybrid stepping motors, flux switching machines and brushless permanent magnet motors and generators. A sensorless control system for an electrical machine is provided comprising a rotor, a stator having one or more phase windings for generating a rotating stator magnetic field, the system comprising detection means for monitoring the currents in the phase windings providing a real component I
      s_real along a real axis at a known angle in line with a rotating reference frame and an imaginary component I
      s_imag orthogonal to the real component I
      s_real , calculating means for determining a value of the real component E
      s_real of the rotational emf along an axis at a known angle in line with a rotating reference frame and an imaginary component (E
      s_imag ) orthogonal to the real component (E
      s_real ), estimating means for estimating an angular position of the rotational emf vector using at least one of the estimated orthogonal components of the emf, error means for determining an angular error signal indicative of the deviation of the estimated angular position from a desired position, and synchronising means for controlling the machine such that the error signal tends towards zero.
    • 74. 发明公开
    • Softstarter device and method for an electric motor
    • 软起动器Vorrichtung und Verfahrenfüreinen Elektromotor
    • EP2293426A1
    • 2011-03-09
    • EP09169226.9
    • 2009-09-02
    • Carlo Gavazzi Services AG
    • Balcon, ClaudioDemicoli, JasonEllul, ThomasGalea, JohannGalea, RogerPerot, MauroVedana, Francesco
    • H02P1/04H02P1/18H02P1/26H02P1/46H02P23/14
    • H02P1/04H02P1/18H02P1/26H02P1/46H02P23/14
    • The invention refers to a self adapting soft starter device and a method to control the softstarting of an electric motor. The self-adapting soft starter device (1) comprises an electric current limiting means (2,4,S11) adapted to limit the electric current supplied to the motor (M) to a preset maximum current limit, a ramp-up time determination means (3A,3B,4) adapted to determine the actual ramp-up time of the electric motor (M), a storing means (6,4,S10) adapted to store a preset minimum ramp-up time, a comparing means (4,S17,S21) adapted to compare the determined actual ramp-up time with said preset reference ramp-up time, a replacing means (4,S18,S22) adapted to replace said preset maximum current limit with an auto-adapted current limit based upon the outcome of the comparison between the determined actual ramp-up time and the said preset reference ramp-up time. The soft-starter therefore automatically optimizes the maximum current limit driven by the motor to match its load requirements. This is particularly useful to cater for load variations with time during the lifetime of the product in the application, as it avoids the need of any human intervention to change the soft-starter settings. This auto-adaptation also extends motor lifetime by reducing wear and tear.
    • 本发明涉及一种自适应软启动器装置和一种控制电动机软起动的方法。 自适应软起动装置(1)包括适于将供给电动机(M)的电流限制在预设最大电流极限的电流限制装置(2,4,S11),斜坡上升时间确定装置 适于确定电动机(M)的实际斜坡上升时间的适配器(3A,3B,4),适于存储预设的最小上升时间的存储装置(6,4,S10),比较装置 ,S17,S21),其适于将确定的实际斜坡上升时间与所述预设参考斜坡上升时间进行比较;替换装置(4,S18,S22),其适于用自适应电流限制替换所述预设最大电流限制 在所确定的实际斜坡上升时间与所述预设参考上升时间之间进行比较的结果。 因此,软启动器自动优化由电机驱动的最大电流限制以匹配其负载要求。 这对于在应用中的产品的使用寿命期间随着时间的变化而特别有用,因为它避免了任何人为干预来改变软启动器设置。 这种自动调整还通过减少磨损和延长来延长电机寿命。
    • 78. 发明公开
    • Audible noise reduction for single current shunt platform
    • 在一个系统中降低可听见的噪声与单个电流传感器
    • EP1780884A3
    • 2009-07-15
    • EP06022413.6
    • 2006-10-26
    • INTERNATIONAL RECTIFIER CORPORATION
    • Ho, Eddy Ying Yin
    • H02P23/14H02P21/00
    • H02P23/14H02M7/53875H02M2001/0009H02P21/00H02P29/50
    • A method and system for reducing audible motor noise in a system for reconstructing motor phase current from a DC bus current comprising current pulses on a DC bus in a PWM inverter motor drive system having a PWM cycle, and for controlling the motor, which forms a command voltage vector according to a space vector modulation arrangement for controlling the motor; measures the DC bus current on the DC bus supplying power to the inverter to reconstruct said motor phase current; and determines when the command voltage vector results in an inverter switching state that prevents the measuring of the DC bus current from accurately indicating motor phase current. During said inverter switching state, a current sampling scheduler applies a minimum pulse width constraint to said current pulses in said DC bus current to improve reconstruction of said motor phase current based on said DC bus current; and reduces the application of said minimum pulse width constraint to less than once per PWM cycle imposed by the PWM inverter motor drive system, thereby allowing motor phase current reconstruction with reduced audible motor noise. The current sampling scheduler synchronously samples said measured motor phase current to reduce errors in said measured motor phase current caused by said reduction of said minimum pulse constraint; reduces a bandwidth of said motor controller during said inverter switching state; and is adjustable in response to motor speed for setting the number of said minimum pulse width constraints per PWM cycle.