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    • 5. 发明授权
    • Device to regulate the speed of an electric motor and its method of
operation
    • 用于调节电动机速度的装置及其操作方法
    • US5410236A
    • 1995-04-25
    • US79519
    • 1993-06-21
    • Mustafa Arroubi
    • Mustafa Arroubi
    • H02P25/04H02P25/14H02P27/02H02P6/02
    • H02P25/145Y10S388/907Y10S388/936
    • Digital device to regulate the speed of an electric motor having a commutating element mounted in series with the motor at the terminals of an A.C. distribution network. A duration of an on-state of the commutating element defines values corresponding to desired reference speeds. The digital device includes a tachometer sensor connected with the motor which emits pulses indicative of the speed of the motor, a microcontroller having an oscillator, a first counter whose count is tied to at least one period of the pulses to calculate an actual speed of the motor, a memory containing desired reference speed values, a comparator to compare the desired reference speed with the actual speed of the motor, and an interface to control the on-state of the commutating element. The digital speed regulation is performed by calculating a range of correction defined as the difference between the reference speed chosen by the user and the first part of a value generated from the first counter, performing a test on the sign of the range of correction and, applying, using a second counter, a correction to the trigger of the commutating element as a function of the sign of the range of correction.
    • 数字装置,用于调节具有与电动机串联安装的交流元件的电动机的速度。 整流元件的导通状态的持续时间定义对应于期望参考速度的值。 该数字装置包括与电动机连接的转速计传感器,其发出表示电动机速度的脉冲,具有振荡器的微控制器,其计数被连接至至少一个脉冲周期的第一计数器,以计算出 电机,包含所需参考速度值的存储器,将所需参考速度与电动机的实际速度进行比较的比较器,以及用于控制换向元件的接通状态的接口。 数字速度调节是通过计算被定义为由用户选择的参考速度与从第一计数器产生的值的第一部分之间的差进行校正的范围,对校正范围的符号执行测试, 根据校正范围的符号,使用第二计数器对整流元件的触发进行校正。
    • 7. 发明授权
    • Structural speed control for electric motors
    • 电机结构速度控制
    • US3914673A
    • 1975-10-21
    • US49075774
    • 1974-07-22
    • SCOVILL MANUFACTURING CO
    • WALLIN GUS WALDEMAR
    • A47J43/08H02K23/66H02P25/18G05D13/10H02P5/30
    • H02K23/66A47J43/082H02P25/182Y10S388/928Y10S388/936
    • A speed control comprises a rotary surface having irregularlyshaped means and driven by the controlled motor. A brush assembly comprises at least part of a make-and-break circuit in series with the motor, the assembly including an engagement portion adapted to ride on the rotary surface. The brush assembly is adjustable so that the engagement portion may be placed at a setting anywhere in a path of traverse along the surface. The irregularly-shaped means causes interruptions of the make-andbreak circuit as the rotary surface rotates under the engagement portion. Because of the shape of the irregularly-shaped means, the interruptions are less in extent and/or frequency if the setting is closer to one end of the path of traverse than the other end. In other words, there is more ''''on'''' time at a setting toward said one end. Hence, the speed of the motor increases at settings toward said one end. Governor means are provided to reduce the extent and/or number of interruptions when the motor speed drops under load.
    • 速度控制包括具有不规则形状的装置并由受控电动机驱动的旋转表面。 电刷组件包括与电动机串联的制动和断路电路的至少一部分,该组件包括适于骑在旋转表面上的接合部分。 刷子组件是可调节的,使得接合部分可以放置在沿着表面的横越路径中的任何位置处的设置。 不规则形状的装置在旋转表面在接合部分的下方旋转时,导致制动和断开电路的中断。 由于不规则形状的装置的形状,如果设置比另一端更靠近横动路径的一端,则中断的程度和/或频率较小。 换句话说,在朝着所述一端的设置上有更多的“开”时间。 因此,在朝向所述一端的设定下,电动机的速度增加。 提供调速器装置以减少电机转速在负载下降时的中断程度和/或数量。