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    • 74. 发明授权
    • Online system and method of locating consumer product having specific configurations in the enterprise production pipeline and inventory
    • 在企业生产管道和库存中定位具有特定配置的消费品的在线系统和方法
    • US06901430B1
    • 2005-05-31
    • US09539392
    • 2000-03-31
    • Stephen Smith
    • Stephen Smith
    • G06F1/16G06Q10/00G06Q30/00G06F15/16
    • G06Q30/06G06F2200/1637G06Q10/08G06Q10/087G06Q10/0875G06Q20/20G06Q20/203G06Q30/02G06Q30/0601
    • An online system of locating consumer product having specific configuration in an enterprise production pipeline and inventory is provided. The system includes a locate client process operable to receive product configuration data and generate a search request message incorporating the product configuration data in response to user input, and an inventory database storing product availability data in the enterprise production pipeline and in inventory. A locate server process is operable to receive the search request message from the locate client process, and search the product availability data in the inventory database for products matching and substantially matching the product configuration data. The locate server is further operable to generate a search reply message containing the matching products and return the search reply message to the locate client process.
    • 提供了一种在企业生产管道和库存中定位具有特定配置的消费品的在线系统。 该系统包括定位客户端进程,其可操作以接收产品配置数据并生成包含响应于用户输入的产品配置数据的搜索请求消息,以及在企业生产流水线和库存中存储产品可用性数据的库存数据库。 定位服务器进程可操作以从定位客户端进程接收搜索请求消息,并且搜索清单数据库中的产品可用性数据,以获得与产品配置数据匹配并基本匹配的产品。 定位服务器还可操作以产生包含匹配产品的搜索回复消息,并将搜索回复消息返回给定位客户端进程。
    • 77. 发明授权
    • Direct current motor speed control
    • 直流电机转速控制
    • US4893067A
    • 1990-01-09
    • US047181
    • 1987-05-06
    • Pradeep BhagwatDuronie HarrellStephen SmithSamuel G. Woods
    • Pradeep BhagwatDuronie HarrellStephen SmithSamuel G. Woods
    • H02P7/288
    • H02P7/2885Y10S388/901
    • The motor speed control circuit senses average back EMF as a measure of motor speed. The back EMF charges a capacitor circuit which accumulates charge and develops a voltage indicative of the motor speed. A sample and hold circuit may be used to sample the back EMF when the motor is switched off during each cycle. This voltage is compared with a reference voltage indicative of the desired motor speed. An error signal is generated by comparing the desired speed with the actual speed and this error signal is used to generate a variable duty cycle pulse train which gates the power controlling transistor on and off to control motor speed. A logic gated or SCR gated voltage boosting circuit operates in synchronism with the gating pulse train to drive the power transistor hard into saturation. This lowers the resistance of the power transistor, causing less energy dissipation as waste heat. The motor speed control circuit produces a family of torque-speed curves which maintain speed constant until a break point is reached, whereupon speed falls inversely proportional to torque. A torque control circuit monitors the motor current and maintains that current at a user selected level to thereby select a desired output torque.
    • 电机速度控制电路将平均反电动势作为电机转速的测量值。 反向EMF对蓄积电荷的电容器电路充电,产生表示电机速度的电压。 当电机在每个周期内关闭时,采样保持电路可用于对反电动势进行采样。 该电压与表示所需电机速度的参考电压进行比较。 通过将期望的速度与实际速度进行比较来产生误差信号,该误差信号用于产生一个可变占空比脉冲串,该脉冲串将功率控制晶体管接通和关断以控制电机速度。 逻辑门控或SCR门控升压电路与门控脉冲串同步工作,以将功率晶体管驱动到饱和状态。 这降低了功率晶体管的电阻,导致作为废热的能量耗散较少。 马达速度控制电路产生一系列扭矩速度曲线,其保持速度恒定,直到达到断点,于是速度与扭矩成反比。 扭矩控制电路监视电动机电流并将电流维持在用户选择的水平,从而选择期望的输出转矩。