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    • 31. 发明申请
    • METHOD AND APPARATUS FOR QUIET FAN SPEED CONTROL
    • 用于快速风扇速度控制的方法和装置
    • US20090072775A1
    • 2009-03-19
    • US12173457
    • 2008-07-15
    • James P. SteinerAaron DobbinsChen Ming Wu
    • James P. SteinerAaron DobbinsChen Ming Wu
    • H02P1/46
    • H02P1/24H02P7/288
    • An AC motor speed controller includes a plurality of capacitors that may be selectively switched, by means of controllably conductive switches, into series electrical connection with an AC motor and an AC voltage source to control the speed of the motor. To change the speed of the motor, a control circuit renders a first switch conductive, in response to a first detected AC voltage zero crossing, to charge a first capacitor to a predetermined voltage. The control circuit then renders a second switch conductive, in response to a subsequent second detected AC voltage zero crossing, to charge a second capacitor to the predetermined voltage. The control circuit then renders both switches simultaneously conductive at a predetermined time after a subsequent third detected AC voltage zero crossing. The capacitors will thereby be charged to the same voltage prior to being switched into series with the motor, thereby resulting in reduced acoustic noise when changing motor speeds.
    • AC电动机速度控制器包括可以通过可控制的导电开关与AC电动机和AC电压源串联电连接以选择性地切换多个电容器,以控制电动机的速度。 为了改变电动机的速度,控制电路响应于第一检测到的交流电压过零而使第一开关导通,以将第一电容器充电至预定电压。 然后,控制电路响应于随后的第二检测到的交流电压过零而使第二开关导通,以将第二电容器充电到预定电压。 然后,控制电路在随后的第三检测到的AC电压过零之后,在预定的时间使两个开关同时导通。 因此,在电动机切换成串联之前,电容器将被充电到相同的电压,从而在改变电动机速度时导致降低的声学噪声。
    • 37. 发明授权
    • Speed control for brushless repulsion motor
    • 无刷斥力电机的速度控制
    • US6049187A
    • 2000-04-11
    • US223981
    • 1999-01-04
    • Lambert Haner
    • Lambert Haner
    • H02K29/10H02K37/00H02P1/24H02P6/00H02P25/10H02P6/08
    • H02K29/10H02K37/00H02P1/24H02P25/102H02P6/00
    • An armature mounted armature speed control system for a brushless repulsion motor of the type including a series of coil switches on the armature for shorting a succession of armature coils and detectors on the armature for operating each of the switches when the armature coil shorted by a switch is at a selected rotational position, the system comprising: a ring counter with sequentially energized output lines for receiving signals in sequence at a rate controlled by the reference frequency of count pules at the input of the counter, means for operating the switches in sequence by the counter created signals to control the speed of the armature at a set point and a selector switch shiftable upon receipt of a shift signal between a first condition with the signals from said counter operating the coil switches and a second condition with the detectors operating the coil switches.
    • 一种用于无刷斥力电动机的电枢安装的电枢速度控制系统,其包括在电枢上的一系列线圈开关,用于在电枢线圈短路时使电枢线圈和电枢上的检测器短路,用于操作每个开关 该系统包括:环形计数器,其具有顺序激励的输出线,用于以计数器的输入端处的计数器的参考频率控制的速率依次接收信号;用于按顺序操作开关的装置, 计数器产生信号以控制在设定点处的电枢的速度,并且选择开关可在接收到来自所述操作线圈开关的所述计数器的信号的第一状态与第二状态之间接收到移位信号时移动,并且检测器操作线圈 开关。