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    • 4. 发明授权
    • Digital generation of 3-phase PWM waveforms for variable speed control
of induction motor
    • 数字生成用于感应电动机变速控制的三相PWM波形
    • US4599550A
    • 1986-07-08
    • US718690
    • 1985-04-02
    • John W. Robertson, Jr.Stuart B. Siegel
    • John W. Robertson, Jr.Stuart B. Siegel
    • H02M7/529H02M7/5387H02P5/40
    • H02M7/53873H02M7/529
    • Programmed digital equipment is utilized to generate three-phase pulse width modulated waveforms that are used in controlling an induction motor. A microprocessor is programmed to initialize conditions in the system, to perform a main task including the storage of converted analog signal, the checking of limits of motor motion and information fed back from the motor concernings its position, and the ramping of frequencies to change the position of the motor. A memory is provided for the programming which memory also contains tables that correspond to 90.degree. of each desired wave form. A single 90.degree. segment of each wave form is needed to generate all parts of each of the three phases. An analog to digital converter is utilized to convert analog information concerning gain, set point, dead band and feedback signal into digital signals which are stored and processed by the microprocessor. Programmable timers are connected to the microprocessors for generating the wave forms and for supplying master timing and interrupt signals indicative of an undesirable condition in the motor control.
    • 使用编程数字设备产生用于控制感应电动机的三相脉宽调制波形。 微处理器被编程以初始化系统中的状况,执行主要任务,包括存储转换的模拟信号,检查电动机运动的极限和从电动机所反馈的信息及其位置,以及改变频率的斜率 电机的位置。 为编程提供存储器,该存储器还包含对应于每个期望波形的90°的表。 需要每个波形的单个90°段来产生三相中的每一个的所有部分。 模拟数字转换器用于将关于增益,设定点,死区和反馈信号的模拟信息转换成由微处理器存储和处理的数字信号。 可编程定时器连接到微处理器,用于产生波形并提供指示电机控制中的不期望状态的主定时和中断信号。