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    • 83. 发明公开
    • ELECTRICAL MACHINES
    • 电机
    • EP1208642A1
    • 2002-05-29
    • EP00954719.1
    • 2000-08-17
    • Black & DeckerUNIVERSITY OF WARWICK
    • Pollock, CharlesPollock, Helen Geraldine, PhyllisWalter, Richard Thomas
    • H02P7/05H02P3/06
    • H02P1/163H02P1/16H02P25/08H02P25/0925
    • An electrical machine comprises a rotor without windings, a stator having an armature winding (24, 25) and a field winding (10) for generating a magnetomotive force in a direction extending transversely of the magnetomotive force generated by the armature winding. An electronic circuit (40) is provided for controlling the current in the armature winding (24, 25) such that periods in which a magnetomotive force in one direction is associated with a first current pulse alternate with periods in which a magnetomotive force in the opposite direction is associated with a second current pulse. A position sensor is provided for monitoring the rotational position of the rotor and for supplying output signals at a rate dependent on the speed of rotation of the rotor. Furthermore a control system supplies control signals to the circuit (40) to control the current in the armature winding (24, 25) in response to the output signals. The control system uses a control signal of extended duration at the beginning of the first current pulse on start-up of the motor from rest as compared with the duration of the control signals produced over the remainder of the first current pulse during acceleration of the rotor. Such an arrangement produces efficient starting from rest, and enables control of acceleration, no-load speed, loaded torque-speed characteristics of the machine to be achieved with simple on-off control of armature and field switching devices, so that the control circuitry can be produced at relatively low cost. Simplification of the control circuitry is further ensured by the fact that such control can be affected without current sensing.
    • 一种电机包括一个无绕组的转子,一个具有电枢绕组(24,25)和一个励磁绕组(10)的定子,用于在横向于由电枢绕组产生的磁势的方向上产生磁动势。 提供电子电路(40),用于控制电枢绕组(24,25)中的电流,使得一个方向上的磁动势与第一电流脉冲相关联的时段与其中相反的磁动势 方向与第二电流脉冲相关联。 提供位置传感器用于监控转子的旋转位置并且以取决于转子旋转速度的速率提供输出信号。 此外,控制系统响应于输出信号向电路(40)提供控制信号以控制电枢绕组(24,25)中的电流。 与在转子加速期间在第一电流脉冲的剩余部分上产生的控制信号的持续时间相比,控制系统在电动机起动时的第一电流脉冲开始时使用延长持续时间的控制信号 。 这种布置从静止开始有效地起动,并且通过电枢和现场开关装置的简单的通断控制,能够实现机器的加速,空载转速,负载转矩 - 速度特性的控制,使得控制电路能够 以较低的成本生产。 控制电路的简化进一步得到保证,因为这种控制可以在没有电流感测的情况下受到影响。
    • 84. 发明公开
    • Microcontroller operated electric motor soft start using a table drive equation with variable timing
    • 使用具有可变定时驱动公式表软启动功率的微控制器电动机
    • EP1139554A2
    • 2001-10-04
    • EP01106648.7
    • 2001-03-16
    • MICROCHIP TECHNOLOGY INC.
    • Butler, Dan
    • H02P1/26
    • H02P29/02H02M3/157H02P1/04H02P1/16H02P1/26
    • An improved current limiter for electrical circuits utilizes a current limiter, a clock, a memory and a processor. The memory contains a two dimensional table having time data in the first dimension and current data in the second dimension. When a control line is activated, the processor receives timing data from the clock in discrete timing events. For each timing event, the processor looks up a current value using the two dimensional table. The current value is then applied by the processor to a current limiter that limits the current to a circuit. The look up sequence can utilize discrete (rounded) timing values, linear interpolation, curve fit interpolation, or other interpolation techniques that can be processed by the processor. The two dimensional table can be pre-loaded from an external source or, in the alternative, the processor can calculate the discrete time values and current values and then load the two dimensional table before operation of the device.
    • 用于电路的改进的限流器利用限流器,时钟,存储器和处理器。 存储器包含在第一维和电流数据在第二维度的二维表具有时间数据。 当控制线被激活时,处理器接收来自于离散的定时事件的时钟定时的数据。 对于每个定时事件,所述处理器查找使用二维表的电流值。 的电流值,然后由处理器应用到一个电流限制器限制那样的电流的电路。 所述查找序列可以利用离散的(四舍五入)定时值,线性内插,曲线拟合内插,或其他插值技术也可以由处理器进行处理。 二维表可以从外部源预先加载到或在替代方案中,处理器可以计算出离散时间值和当前值,然后该装置的手术前加载二维表。
    • 85. 发明公开
    • Integrated soft starter for electric motor
    • 一种用于电动机的软起动集成驱动器设备
    • EP1037515A2
    • 2000-09-20
    • EP00105029.3
    • 2000-03-09
    • EATON CORPORATION
    • Becker, James AllenVon Eckroth, KurtWieloch, Christopher John
    • H05K7/14H02M7/00
    • H05K7/1432H01H9/542H02P1/16
    • A solid state motor starter (10), commonly referred to as a soft starter, is constructed in a manner to be easily manufacturable while at the same time combining all the required components in a relatively small package. A solid state power switch (46, 48) is clamped between a pair of bus bars (32, 42) in an offset manner to accommodate a discrete switching relay (50) mounted in an inverted manner between the line input (36) and the bus bar in communication with the load outputs (44). When in a motor run mode, current is shunted away from the solid state power switching device (46, 48) and through the switching relay (50), a substantially linear current path is achieved to reduce power loss and heat buildup. The arrangement allows for a heat sink (64) mounted to one of the bus bars (32, 42) with adequate spacing between the heat sink (64) and the discrete relay (50) for insertion of a cooling fan (66). Current sensing is achieved with a Hall effect sensor (130) mounted to the bus bar (32, 42) in a small current sensing region (116) that is created by having a pair of slots (104, 105) in the bus bar (32, 42) to direct current. A pair of magnetic pins (124) extend perpendicular from the bus bar (32, 42) to create the magnetic flux for the Hall effect sensor (130) to sense current flow through the current sensing region (116). The Hall effect sensor circuit board (132) also contains a thermistor (134) which is mounted with adequate insulation (150, 154) yet in thermal communication with the bus bar (32, 42).
    • 86. 发明公开
    • Verfahren zum Anfahren einer untersynchronen Stromrichterkaskade
    • Verfahren zum Anfahren einer不同步Stromrichterkaskade。
    • EP0144848A2
    • 1985-06-19
    • EP84113960.3
    • 1984-11-19
    • BBC Brown Boveri AG
    • Zürcher, Urs
    • H02P1/16H02K17/34
    • H02P1/16
    • (57) Untersynchrone Stromrichterkaskaden aus einem Asynchronmotor (3) mit Schleifringläufer, bei dem die im untersynchronen Betrieb freiwerdende Schlupfleistung über einen Umrichter (11) dem Stromversorgungsnetz (1) wieder zugeführt wird, werden zum Antrieb von Pumpen, Ventilatoren und Verdichtern im Leistungsbereich von etwa 2 MW bis 20 MW verwendet. Zur Vermeidung von besonderen rotorseitigen Anlasserwiderständen und Rotorumschaltschützen für alle Phasen des Wechselstroms wird der Umrichter (11), insbesondere ein netzseitiger Stromrichter (10), so geregelt, dass der Gleichstrom (I d ) im Gleichstromzwischenkreis des Umrichters während des Anfahrens im wesentlichen konstant gehalten wird. Dazu wird der netzseitige Stromrichter (10) zunächst in die Endlage seines Wechselrichterbetriebes gesteuert und mit zunehmender Drehzahl des Asynchronmotors (3) mehr und mehr in den Gleichrichterbetrieb gefahren. Jeweils am gleichrichterseitigen Regelende des Stromrichters (10) wird einer der Zwischenkreiswiderstände (R 1 , R 2 ) durch Zünden eines abschaltbaren Thyristors (7, 8) oder durch Schliessen eines Schalters (9) kurzgeschlossen. Gleichzeitig damit wird der netzseitige Stromrichter (10) in seine Endlage des Wechselrichterbetriebes gesteuert.
    • 1.一种用于启动次同步静态转换器级联的方法,包括具有滑动转子(3)的异步机,其中在次同步操作中释放的滑差功率经由具有直流链路电路的变频器提供给电源系统(1) 在这种布置中,在启动期间,频率转换器和接收滑动能量的一部分雷达被调节成使得变频器(11)的直流连接电路中的直流(ld)基本上是 保持恒定,其特征在于a)在变频器(11)的直流连接电路中使用至少一个欧姆连接电路电阻(R1,R2),频率的电力系统侧的静态转换器(10) 转换器(11)从变频器运行转换到整流器运行,并随后反向回到逆变器运行的最终位置,b)与此反转同时,欧姆连线电路 (R1,R2)短路,c)此后,电力系统侧的静态转换器被调节回变频器(11)的直流连接电路中的恒定直流电流(ld)。