公开(公告)号：EP0040484A3

公开(公告)日：1982-08-11

申请号：EP81301930

申请日：1981-05-01

申请人： ROTRON INCORPORATED

发明人： McDaniel, Wharton ,  Brown, Fred A. ,  Thompson, Donald

IPC分类号： H02K29/02

CPC分类号： H02K29/08

摘要： A brushless D.C. motor with a permanent magnet rotor (20) employs Hall switches (70) to effect commutation. The rotor magnets (50) are of a greater axial length than the stator laminations (40) and the Hall switches are mounted on a printed circuit panel (60) within the stator frame (12) so as to be actuated by the fringe flux from the portion of rotor magnets (50) extending beyond the stator laminations (40). The pole faces of the stator laminations are stepped to assure proper starting and direction of rotation. A voltage regulating circuit (106, 108, Q1) forming part of the commutating arrangement on the printed circuit panel enables the same circuit to be used for a range of stator energizing voltages. A switching circuit responsive to the analog output voltage of said Hall switches (70) provides a binary output voltage and includes transistors (Q3 and Q4) coupled to each stator winding (42a and 42b) and a transistor (Q2) responsive to the binary output of the Hall switches (70) for alternately switching the transistors (Q3 and Q4) to connect the stator windings (42a and 42b) to a D.C. power supply.

公开(公告)号：EP0056294A3

公开(公告)日：1983-06-01

申请号：EP82300003

申请日：1982-01-04

申请人： ROTRON INCORPORATED

发明人： Brown, Fred A. ,  Grouse, Alan F.

IPC分类号： G08B21/00 ,  H03K17/90 ,  G01P03/48 ,  H03K17/18

CPC分类号： G08B21/187 ,  H03K17/9517

摘要： An arrangement for sensing the operating condition of an alternating current machine (10) employs a Hall switch (32) on the stator (12) which is subjected to the alternating magnetic field established during operation. The Hall switch (32) has a magnetic field strength threshold below which it will not be actuated. During normal operation of the machine, the alternating field strength will cyclically exceed the switch threshold, thereby generating a series of pulses at the frequency of alternation of the field. Should the field strength decrease as a result of overload of the machine, or a decrease in line voltage, to a level below the threshold level of the switch (32), the pulse output of the switch will cease. Circuitry (34, 36, Q 1 ) responsive to the absence of periodic pulses actuates an indicator circuit (38) to warn of the faulty operation.

公开(公告)号：EP0040484B1

公开(公告)日：1985-10-30

申请号：EP81301930.4

申请日：1981-05-01

申请人： ROTRON INCORPORATED

发明人： McDaniel, Wharton ,  Brown, Fred A. ,  Thompson, Donald

IPC分类号： H02K29/08

CPC分类号： H02K29/08

公开(公告)号：EP0090514A1

公开(公告)日：1983-10-05

申请号：EP83301207.3

申请日：1983-03-07

申请人： ROTRON INCORPORATED

发明人： Brown, Fred A.

IPC分类号： G05D23/24 ,  G05F1/46

CPC分类号： G05F1/463 ,  G05D23/1906 ,  G05D23/24

摘要： A temperature tracking D.C. motor speed controlled fan (15) employs a temperature sensitive circuit element (35) to control the output voltage of a voltage regulator (24) which is applied as the D.C. input to the fan motor circuit (18). Typically, the voltage regulator (24) is an integrated circuit voltage regulator having an adjustable output voltage, variable as a function of circuit elements connected thereto. In each of several circuit arrangements, a thermistor (35) senses temperature to increase voltage and consequently fan speed with rising temperatures. In a preferred embodiment the thermistor is used to control the base drive of a transistor (Q 1 ) connected to the regulator. A Zener diode (0 2 ) connected in series with the transistor (Q 1 ) can provide a minimum output voltage from the voltage regulator, keeping the D.C. motor (10) of the fan turning at a low, quiet speed. The voltage applied to the thermistor (35) can be derived partly or wholly from the input to the regulator, reducing or eliminating the negative feedback effect that comes from deriving the thermistor voltage from the controlled output. A voltage stabilization circuit including a Zener diode (D 3 ) at the input to the voltage regulator can provide a stabilized voltage to the thermistor.

摘要翻译： 温度跟踪直流电动机速度控制风扇（15）采用温度敏感电路元件（35）来控制作为直流输入端施加到风扇电动机电路（18）的电压调节器（24）的输出电压。 通常，电压调节器（24）是具有可调节的输出电压的集成电路电压调节器，其可以作为与其连接的电路元件的函数而变化。 在几种电路布置中，热敏电阻（35）感测温度以随温度升高而增加电压和风扇转速。 在优选实施例中，热敏电阻用于控制连接到调节器的晶体管（Q1）的基极驱动。 与晶体管（Q1）串联连接的齐纳二极管（D2）可以提供来自电压调节器的最小输出电压，保持风扇的直流电动机（10）以低的静止速度转动。 施加到热敏电阻（35）的电压可以部分地或全部地从调节器的输入中导出，从而减少或消除从受控输出导出热敏电阻电压所引起的负反馈效应。 在电压调节器的输入端包括齐纳二极管（D3）的稳压电路可以向热敏电阻提供稳定的电压。

公开(公告)号：EP0056294B1

公开(公告)日：1986-05-07

申请号：EP82300003.9

申请日：1982-01-04

申请人： ROTRON INCORPORATED

发明人： Brown, Fred A. ,  Grouse, Alan F.

IPC分类号： G08B21/00 ,  H03K17/90 ,  G01P3/48 ,  H03K17/18

CPC分类号： G08B21/187 ,  H03K17/9517

公开(公告)号：EP0141479A1

公开(公告)日：1985-05-15

申请号：EP84300856.6

申请日：1984-02-10

申请人： ROTRON INCORPORATED

发明人： Reffelt, James

IPC分类号： H02K29/08

CPC分类号： H02K29/08

摘要： A brushless DC motor of the kind that includes a relatively large rotor permanent magnet (14) magnetized radially in segments around its circumference to provide alternate segments oppositely magnetized has a stator (12) magnetic structure with two dissimilar pole pieces (46,47) in flux conducting relation to a pair of windings. A first of the pole pieces (46) presents a face to the outer surface of the annular magnet across an air gap. A second pole piece (47), which may be somewhat further from the outer surface of the annular magnet (14), at the opposite end of the windings, presents only a norrow edge surface (62) facing generally in the direction of the magnet. The modified pole piece (80) is L-shaped or U-shaped, having one or two legs (82, 83) respectively, projecting from the coil support structure generally circumferentially with respect to the magnet. The legs (82, 83) taper towards their ends more remote from the coil (41) support structure and form broader upper and lower surfaces more nearly perpendicular the axis of magnet rotation than the narrow edge surface or surfaces facing the magnet across the air gap.

公开(公告)号：EP0040484A2

公开(公告)日：1981-11-25

申请号：EP81301930.4

申请日：1981-05-01

申请人： ROTRON INCORPORATED

发明人： McDaniel, Wharton ,  Brown, Fred A. ,  Thompson, Donald

IPC分类号： H02K29/08

CPC分类号： H02K29/08

摘要： A brushless D.C. motor with a permanent magnet rotor (20) employs Hall switches (70) to effect commutation. The rotor magnets (50) are of a greater axial length than the stator laminations (40) and the Hall switches are mounted on a printed circuit panel (60) within the stator frame (12) so as to be actuated by the fringe flux from the portion of rotor magnets (50) extending beyond the stator laminations (40). The pole faces of the stator laminations are stepped to assure proper starting and direction of rotation. A voltage regulating circuit (106, 108, Q1) forming part of the commutating arrangement on the printed circuit panel enables the same circuit to be used for a range of stator energizing voltages. A switching circuit responsive to the analog output voltage of said Hall switches (70) provides a binary output voltage and includes transistors (Q3 and Q4) coupled to each stator winding (42a and 42b) and a transistor (Q2) responsive to the binary output of the Hall switches (70) for alternately switching the transistors (Q3 and Q4) to connect the stator windings (42a and 42b) to a D.C. power supply.

公开(公告)号：EP0660745A1

公开(公告)日：1995-07-05

申请号：EP93921621.0

申请日：1993-09-16

申请人： ROTRON INCORPORATED

发明人： KANT, Wayne, D. ,  SINGLETON, Bruce

IPC分类号： B01D53 ,  C12S5

CPC分类号： B01D53/85 ,  Y02A50/2359 ,  Y10S95/901

摘要： A biofilter for the removal of contaminants from gas streams disclosed. The biofilter makes use of a series of modular trays, each containing a gas-contacting medium for removing at least one contaminant from the process stream. The trays have a modular design that allows them to be sealingly stacked and to be configured to allow series, parallel or series-parallel flow through the biofilter.

公开(公告)号：EP0141479B1

公开(公告)日：1988-06-01

申请号：EP84300856.6

申请日：1984-02-10

申请人： ROTRON INCORPORATED

发明人： Reffelt, James

IPC分类号： H02K29/08

CPC分类号： H02K29/08

公开(公告)号：EP0056294A2

公开(公告)日：1982-07-21

申请号：EP82300003.9

申请日：1982-01-04

申请人： ROTRON INCORPORATED

发明人： Brown, Fred A. ,  Grouse, Alan F.

IPC分类号： G08B21/00 ,  H03K17/90 ,  G01P3/48 ,  H03K17/18

CPC分类号： G08B21/187 ,  H03K17/9517

摘要： An arrangement for sensing the operating condition of an alternating current machine (10) employs a Hall switch (32) on the stator (12) which is subjected to the alternating magnetic field established during operation. The Hall switch (32) has a magnetic field strength threshold below which it will not be actuated. During normal operation of the machine, the alternating field strength will cyclically exceed the switch threshold, thereby generating a series of pulses at the frequency of alternation of the field. Should the field strength decrease as a result of overload of the machine, or a decrease in line voltage, to a level below the threshold level of the switch (32), the pulse output of the switch will cease. Circuitry (34, 36, Q 1 ) responsive to the absence of periodic pulses actuates an indicator circuit (38) to warn of the faulty operation.

摘要翻译： 用于感测交流电机（10）的操作状况的装置在定子（12）上采用霍尔开关（32），该霍尔开关受到在操作期间建立的交变磁场的影响。 霍尔开关（32）具有磁场强度阈值，低于该阈值时不会被启动。 在机器的正常操作期间，交变场强度将周期性地超过开关阈值，由此在场的交替频率处产生一系列脉冲。 如果由于机器过载或线路电压下降导致场强降低到低于开关（32）的阈值水平的水平，则开关的脉冲输出将停止。 响应于不存在周期性脉冲的电路（34,36，Q1）启动指示器电路（38）以警告错误的操作。