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公开(公告)号：US4024525A
公开(公告)日：1977-05-17
申请号：US647295
申请日：1976-01-07
摘要： A brush which presses against the commutator of a direct current machine has a groove in one side thereof into which a fixed probe partially extends. As the brush wears, movement thereof causes physical engagement of the probe with the end of the groove to complete a current path through the probe. Flow through the current path energizes and latches a warning device.
摘要翻译： 按压直流电机的换向器的电刷在其一侧具有一个沟槽，固定的探针部分延伸到该槽中。 当电刷磨损时，其运动导致探头与槽的端部的物理接合以完成穿过探针的电流路径。 通过电流通路的电流通电并锁定警告装置。
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公开(公告)号：US4879623A
公开(公告)日：1989-11-07
申请号：US803285
申请日：1985-12-02
CPC分类号： H02H7/0833 , H02H3/50
摘要： Motor control systems having solid-state components are commonly used on industrial vehicles such as lift trucks. Such solid-state components are easily damaged by excessive transient voltages. The subject invention includes a power supply for supplying direct current to a motor circuit, wherein the direct current has a nominal direct current voltage value and as associated transient voltage component. A pulse control circuit supplies current pulses from the power supply to a motor. A sensing device controllably produces a fault signal in response to the amplitude and frequency of occurrence of the transient voltage component exceeding a predetermined maximum value. An override circuit receives the fault signal and responsively modifies the current pulses delivered from the power supply to the associated motor.
摘要翻译： 具有固态部件的电动机控制系统通常用于诸如起重车的工业车辆上。 这种固态元件容易被过大的瞬态电压损坏。 本发明包括用于向电动机电路提供直流电的电源，其中直流具有标称直流电压值和相关联的瞬态电压分量。 脉冲控制电路将来自电源的电流脉冲提供给电动机。 感测装置响应于超过预定最大值的瞬态电压分量的发生的振幅和频率可控地产生故障信号。 超控电路接收故障信号并且响应地修改从电源传送到相关联的电动机的电流脉冲。
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公开(公告)号：US06227157B1
公开(公告)日：2001-05-08
申请号：US09309102
申请日：1999-05-10
申请人： Kenneth A. Baumgartner , Michael A. Caruthers , Christopher F. Gallmeyer , Robert L. Miller , Kenneth J. Suda
发明人： Kenneth A. Baumgartner , Michael A. Caruthers , Christopher F. Gallmeyer , Robert L. Miller , Kenneth J. Suda
IPC分类号： F02B900
CPC分类号： F02P19/025 , F02B9/00 , F02D2041/2027 , F02D2200/0414 , F02P19/023 , F02P19/027
摘要： An AC glow plug system is provided that includes a static converter for DC to AC conversion. Control techniques include varying the converter duty cycle according to glow plug temperature and other parameters such as engine air or coolant temperatures for smooth running as well as for prolonging glow plug life. Control is also varied according to fuel system characteristics and fuel composition.
摘要翻译： 提供了一种AC电热塞系统，其包括用于DC到AC转换的静态转换器。 控制技术包括根据电热塞温度和其他参数（如发动机空气或冷却液温度）来改变转换器占空比，以实现平稳运行以及延长电热塞寿命。 控制也根据燃油系统特性和燃油组成而变化。
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公开(公告)号：US4691149A
公开(公告)日：1987-09-01
申请号：US786580
申请日：1985-10-11
CPC分类号： H02H7/0833 , H03K17/0826 , Y10S388/903 , Y10S388/92
摘要： Motor control circuits having solid-state switching elements are commonly used on industrial vehicles such as lift trucks. A short circuit condition in the motor circuit can cause catastrophic failure of the semiconductor switching element. The instant invention detects such a short circuit condition and modifies the motor control signals supplied by a chopper circuit to a switching element. The apparatus includes a trigger circuit for receiving the motor control signals and sensing a voltage across the motor produced in response to electrical power delivered from a power supply.
摘要翻译： 具有固态开关元件的电机控制电路通常用于诸如起重车的工业车辆上。 电动机电路中的短路状态可能导致半导体开关元件的灾难性故障。 本发明检测这样的短路状态，并且将由斩波电路提供的电动机控制信号修改为开关元件。 该装置包括触发电路，用于接收电动机控制信号并感测响应于从电源传递的电力而产生的电动机上的电压。
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公开(公告)号：US5142435A
公开(公告)日：1992-08-25
申请号：US533059
申请日：1990-06-04
摘要： An apparatus is provided for precharging a filter capacitor to prevent damage to a set of contacts resulting from arcing across the contacts. Included is a coil, a set of contacts, and a battery, such that the contacts and filter capacitor are connected in series and the series connected combination is connected in parallel across the battery. Also included is a switch, and a microprocessor for producing a triggering signal responsive to the closure of the switch. A driving circuit receives the triggering signal and responsively produces a charging signal. A charging circuit receives the charging signal and responsively charges the filter capacitor. Thereafter, the microprocessor produces an energizing signal causing the coil to become energized and the contacts to responsively close. By precharging the filter capacitor before the closure of the contacts, the voltage potential across the contacts is reduced. Therefore, no damage occurs due to arcing across the contacts.
摘要翻译： 提供一种用于对滤波电容器进行预充电以防止损坏通过触点的电弧产生的一组触点的装置。 包括线圈，一组触点和电池，使得触点和滤波电容器串联连接，串联连接的组合在电池上并联连接。 还包括开关和用于产生响应于开关闭合的触发信号的微处理器。 驱动电路接收触发信号并且响应地产生充电信号。 充电电路接收充电信号并对滤波电容进行响应性充电。 此后，微处理器产生激励信号，使得线圈通电，并且触点响应地闭合。 通过在触点闭合之前对滤波电容进行预充电，触点两端的电压降低。 因此，不会因触点上的电弧而发生损坏。
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公开(公告)号：US4552370A
公开(公告)日：1985-11-12
申请号：US483658
申请日：1983-04-11
IPC分类号： B23B31/20
CPC分类号： B23B31/208 , Y10T279/3487 , Y10T408/99 , Y10T82/2579
摘要： Disclosed is a workpiece collet mountable in a lathe spindle provided with a master stem on which any one of a set of workpiece stops may be mounted and which stem includes a support readily assembled to the collet repeatedly in a predetermined position. The stops differ in length and/or radius to accommodate workpieces of different terminal configurations. This permits one stop to be substituted for another with assurance that its outer end will be spaced a predetermined distance from the adjacent end of the collet when the master stem is reassembled to the collet. Both ends of the master stem are similarly threaded and finished with stop surfaces permitting the stem to be inverted and used to mount a selected one of the set of stops.
摘要翻译： 公开了一种可安装在车床主轴中的工件夹头，该主轴设置有主杆，可在其上安装一组工件挡块中的任何一个，并且哪个杆包括容易地在预定位置组装到夹头的支架。 长度和/或半径不同的止挡件可适应不同端子构型的工件。 这允许一个停止件替代另一个止动件，并且保证当主杆被重新组装到夹头时，其外端将与夹头的相邻端部间隔预定距离。 主杆的两端类似地被螺纹化并且具有止动表面，并且用止动表面完成，从而允许杆反转并用于安装所述一组止动件中的所选择的一个。
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公开(公告)号：US4334176A
公开(公告)日：1982-06-08
申请号：US103645
申请日：1979-09-11
摘要： In the control of two or more electrical devices powered by a common battery and each actuated by a separate controlled rectifier chopper circuit, at least one of which is an SCR chopper circuit, under high stress conditions requiring both electrical devices to be repeatedly and rapidly turned on and off it has been found that control over the SCR chopper circuit can be lost due to inherent inductive effects which prevent the charging of the commutating capacitor of the SCR chopper to at least full open circuit battery voltage. This problem is met by inhibiting the occurrence of an "off" actuation control signal to the SCR chopper circuit for a given period of time before and a given period of time after an "on" actuation control signal to the other chopper circuit. Thus, in a battery powered lift truck, for example, having a drive motor and a lift pump motor each actuated by an independent SCR chopper circuit, an "on" actuation control signal to the drive motor circuit is sensed and any "off" actuation control signal to the lift pump motor circuit is inhibited for a few hundred microseconds before and a few hundred microseconds after the drive motor circuit is actuated to allow the battery to return to at least full open circuit voltage before the pump motor circuit is turned off.
摘要翻译： PCT No.PCT / US79 / 00738 Sec。 371 1979年9月11日 102（e）1979年9月11日PCT PCT申请日1979年9月11日PCT公布。 公开号WO81 / 00796 日期为1981年3月19日。在控制由普通电池供电且由单独的可控整流器斩波电路驱动的两个或多个电气设备中，其中至少一个是SCR斩波电路，在高应力条件下， 已经发现，要重复并快速地打开和关闭的装置已经发现，由于固有的电感效应，可能会损失对SCR斩波电路的控制，这些电感效应阻止了SCR斩波器的换向电容器的充电至少达到了完整的开路电池电压。 通过在向另一个斩波电路的“接通”致动控制信号之后的给定时间段和给定时间段之前，通过禁止向SCR斩波电路发出“关闭”致动控制信号来实现该问题。 因此，在电动助力起重车中，例如具有由独立的SCR斩波电路驱动的驱动电动机和提升泵电动机，感测到到驱动电动机电路的“接通”致动控制信号，并且任何“关闭”致动 在驱动电动机电路被致动之前和数百微秒之前，对提升泵电动机电路的控制信号被禁止几百微秒，以允许电池在泵电动机电路关闭之前返回至少完整的开路电压。
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