公开(公告)号：US4474534A

公开(公告)日：1984-10-02

申请号：US378839

申请日：1982-05-17

申请人： Herbert W. Thode

发明人： Herbert W. Thode

IPC分类号： F04D29/32 ,  F04D29/66

CPC分类号： F04D29/328

摘要： An axial flow fan has a plurality of impeller blades spaced around a hub assembly. The leading edge of each blade overlaps completely the trailing edge of the preceding blade, and the angular spacing between the radial center lines of the blades is unequal, preferably varying in a sinusoidal pattern, so that tonal noise of the fan is effectively attenuated.

摘要翻译： 轴流风扇具有围绕轮毂组件间隔开的多个叶轮叶片。 每个叶片的前缘完全与先前叶片的后缘重叠，并且叶片的径向中心线之间的角度间隔是不相等的，优选地以正弦图案变化，使得风扇的音调噪声被有效地衰减。

公开(公告)号：US4348604A

公开(公告)日：1982-09-07

申请号：US159408

申请日：1980-06-13

申请人： Herbert W. Thode

发明人： Herbert W. Thode

IPC分类号： H02K9/18 ,  H02K9/00

CPC分类号： H02K9/18

摘要： A totally enclosed electrical machine, particularly a high power electric motor, is provided with a plate-type, crossflow, air-to-air heat exchanger which is seated on the frame of the electrical machine. Adjacent plates of the heat exchanger are modular units which define an array of ducts through which the internal air heated by the machine flows in a direction away from the machine. The ducts at opposite ends of the array provide passages for the bi-directional flow of air, such that air which is cooled in the heat exchanger is returned to the opposite ends of the machine. The heat exchanger is provided with a plenum in which air is returned to the end ducts. A baffle in the plenum distributes the air in different amounts, which vary progressively but in opposite senses, to the return ducts which communicate with the opposite ends of the machine thereby equalizing the temperature of the return air supplied to the opposite ends of the machine and providing uniform cooling of the machine. External air is directed through channels between adjacent plates of the heat exchanger, the opposite sides of which define the ducts for the internal machine air. The entire unit can readily be assembled at low cost.

摘要翻译： 全封闭电机，特别是大功率电动机，设置有一个板式的，交叉流动的空气对空气热交换器，其位于电机的框架上。 热交换器的相邻板是模块化单元，其限定了一组管道，由机器加热的内部空气通过该排列沿远离机器的方向流动。 阵列的相对端处的管道为空气的双向流动提供通道，使得在热交换器中被冷却的空气返回到机器的相对端。 热交换器设置有气室，空气在空气室中返回到末端管道。 增压室中的挡板以与机器的相对端连通的返回管道不同的数量分配空气，其不同程度地逐渐变化，但是以相反的方式变化，从而使供应到机器的相对端的返回空气的温度相等， 提供机器的均匀冷却。 外部空气通过热交换器的相邻板之间的通道引导，其相对侧限定内部机器空气的管道。 整个单元可以容易地以低成本组装。

公开(公告)号：US3969659A

公开(公告)日：1976-07-13

申请号：US533044

申请日：1974-12-16

申请人： Herbert W. Thode

发明人： Herbert W. Thode

IPC分类号： H02P25/26 ,  H02P7/62

CPC分类号： H02P25/26

摘要： A system including an alternating current electric motor of the wound rotor type wherein the speed of the motor is controlled and its starting current is limited, is disclosed. A plurality of phase regulated SCR devices control the amount of resistance in the rotor winding circuits. A control voltage representing the difference between a desired motor speed and the actual motor shaft speed is supplied to an analog to digital converter which produces a multi-bit digital signal which controls the SCR devices so as to control rotor current in incremental steps. A vernier control signal is obtained by converting the digital signals back into analog form and comparing the control signal with the converted analog signal through the use of a difference amplifier circuit in a vernier amplifier. During start up, when the motor is brought up to speed and until the motor speed is close to the predetermined speed, the digital signal from the analog to digital converter is inhibited causing the SCR-resistor current paths in the rotor winding circuits to become open circuited. Another SCR-resistor vernier path which is connected to the rotor windings is operated by the vernier control signal to control the rotor current so as to provide for smooth low current starts as well as to control current in the rotor windings between the digitally controlled incremental steps.

摘要翻译： 公开了一种包括绕线转子型交流电动机的系统，其中电动机的速度被控制并且其起动电流被限制。 多个相位调节SCR器件控制转子绕组电路中的电阻量。 表示期望电动机速度与实际电动机轴速度之间的差的控制电压被提供给模数转换器，该模数转换器产生控制SCR装置的多位数字信号，以便以递增的步骤控制转子电流。 通过将数字信号转换为模拟形式并通过使用游标放大器中的差分放大器电路将控制信号与转换的模拟信号进行比较来获得游标控制信号。 在启动期间，当马达达到速度并且直到电机速度接近预定速度时，来自模数转换器的数字信号被禁止，导致转子绕组电路中的SCR电阻电流路径变得开放 电路 连接到转子绕组的另一个SCR电阻游标路径通过游标控制信号进行操作，以控制转子电流，以便提供平滑的低电流启动以及控制数字控制的增量步骤之间的转子绕组中的电流 。