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    • 6. 发明授权
    • Systems and methods for protecting a single phase motor from circulating
currents
    • 用于保护单相电机免受循环电流的系统和方法
    • US5675231A
    • 1997-10-07
    • US647694
    • 1996-05-15
    • Roger C. BecerraMark A. Brattoli
    • Roger C. BecerraMark A. Brattoli
    • H02H7/08H02P7/00H02P29/00H02P5/40
    • H02P7/0094H02P29/027H02P29/40H02P7/04H02H7/08H02H7/0838
    • A single phase motor system and method for preventing excessive circulating currents in the motor. The motor has a power supply link including power switches responsive to a motor control signal for connecting the motor winding to a power supply in alternating on and off intervals. A current sensing circuit senses current in the power supply link during the on intervals. A current regulation circuit generates a current regulation signal representative of the difference between the sensed current and a peak regulated current level that is a function of desired motor speed and/or torque. An overcurrent circuit generates an overcurrent signal in response to the sensed current exceeding a maximum current level greater than the peak regulated current level. The motor also has a control circuit responsive to the current regulation signal for generating the motor control signal thereby to regulate current in the winding and control the motor speed and/or torque. At least one of the on intervals is greater than or equal to a minimum interval which is independent of the current regulation signal. The control circuit is also responsive to the overcurrent signal for causing the power switches to disconnect the winding from the power supply thereby to prevent excessive currents from circulating in the motor.
    • 一种用于防止电动机中过度循环电流的单相电动机系统和方法。 电动机具有电源链路,其包括响应于电动机控制信号的电力开关,用于以交替的间隔和交替的方式将电动机绕组连接到电源。 电流感测电路在接通间隔期间感测电源链路中的电流。 电流调节电路产生表示感测电流与作为期望电机速度和/或转矩的函数的峰值调节电流电平之间的差的电流调节信号。 过电流电路响应于感测电流超过大于峰值调节电流电平的最大电流电平而产生过电流信号。 电动机还具有响应于电流调节信号的控制电路,用于产生电动机控制信号,从而调节绕组中的电流并控制电动机速度和/或转矩。 至少一个间隔时间间隔大于或等于与电流调节信号无关的最小间隔。 控制电路还响应于过电流信号,使电源开关从电源上断开绕组,从而防止电动机中过多的电流循环。
    • 9. 发明授权
    • Control system, electronically commutated motor system, draft inducer
apparatus and method
    • 控制系统,电子换向电机系统,牵引机设备及方法
    • US5075608A
    • 1991-12-24
    • US483329
    • 1990-02-20
    • David M. ErdmanMark A. Brattoli
    • David M. ErdmanMark A. Brattoli
    • B60H1/32F23N3/08F25B49/02G05D23/19H02K29/06H02K29/10H02P6/16H02P6/18
    • F23N3/082F25B49/025G05D23/19H02K29/06H02K29/10H02P6/16H02P6/182F23N2033/04F25B2600/021
    • A control system and method for an electronically commutated motor having a stationary assembly with a plurality of winding stages for carrying a motor current in response to application of a voltage having a magnitude subject to variations, the motor further having a rotatable assembly. The control system is adapted to receive control pulses having a duty cycle which is a function of a desired operating torque or speed for the motor. The control system and method are responsive to the motor current for generating a pluse width modulated (PWM) series of pulses having a pulse repetition rate having a duty cycle which is a function of the duty cycle of the control pulses. The PWM series of pulses are supplied to the commutating circuit as a pulsed signal whereby the operating torque or speed of the motor is a function of the duty cycle of the control pulses and is substantially independent of variations in the magnitude of the applied voltage. The control system may be part of a draft inducer apparatus or method for use with a combustion chamber having an exhaust outlet including a fan for moving air through the exhaust outlet and thereby to induce a draft in the combustion chamber. A pressure sensor connected to the motor control apparatus may be located within the exhaust outlet.
    • 一种用于电子换向电动机的控制系统和方法,具有具有多个绕组段的固定组件,用于响应于施加具有变化幅度的电压而承载电动机电流,所述电动机还具有可旋转组件。 控制系统适于接收具有占空比的控制脉冲,该占空比是电动机的期望的操作转矩或速度的函数。 控制系统和方法响应于电动机电流,用于产生具有占空比的脉冲重复频率的脉冲宽度调制(PWM)脉冲序列,该占空比是控制脉冲的占空比的函数。 PWM脉冲序列作为脉冲信号提供给换向电路,由此马达的运行转矩或速度是控制脉冲的占空比的函数,并且基本上与所施加的电压的幅度的变化无关。 控制系统可以是与具有排气出口的燃烧室一起使用的牵引式诱导装置或方法的一部分,所述排气出口包括用于通过排气出口移动空气的风扇,从而在燃烧室中引起通风。 连接到马达控制装置的压力传感器可以位于排气出口内。