公开(公告)号：EP0239026B1

公开(公告)日：1993-05-12

申请号：EP87104119.0

申请日：1987-03-20

申请人： Performance Controls, Inc.

发明人： Goff, Jerry K. ,  Chizever, Gary E.

IPC分类号： G01D5/247 ,  H02P6/02 ,  G01D5/245

CPC分类号： H02P6/16 ,  G01D5/247 ,  H02P6/15

公开(公告)号：EP0470499A3

公开(公告)日：1992-05-06

申请号：EP91112898.1

申请日：1991-07-31

申请人： Performance Controls, Inc.

发明人： Goff, Jerry K.

IPC分类号： H02M7/5387

CPC分类号： H02M7/493 ,  H02M7/5387 ,  H02M7/53871

摘要： A pulse-width modulated (PWM) circuit applies a voltage across a load (32) in accordance with a PWM command signal (I). The command signal (I) is converted into first and second trains of pulses (x, x'), by electronically comparing the command signal with a triangular dither signal (D) and also with the dither signal which has been shifted by half its period. These two pulse trains, and two more pulse trains (y, y) obtained by taking the complements of the original pulse trains, are applied to a pair of bridge circuits (A, B). The load (32) is connected to both bridge circuits. Both bridge circuits are configured such that when a pulse is present, from either the first or the second pulse train, no net voltage appears across the load. At all other times, substantially the entire power supply voltage is applied across the load. In another embodiment, n pairs of bridge circuits are connected across the load. The pulse trains are generated using dither signals which are shifted in time. The pulse trains of one pair of bridge circuits are shifted from the next pair by t/2n, where t is the period of the dither signal. The greater n, the less the effective ripple current in the load. The invention is especially suitable for use in controlling gradient coils in a magnetic resonance imaging system.

摘要翻译： 脉冲宽度调制（PWM）电路根据PWM命令信号（I）在负载（32）两端施加电压。 通过将命令信号与三角形抖动信号（D）进行电子比较，并将抖动信号偏移一半的周期，将命令信号（I）转换为第一和第二脉冲序列（x，x'） 。 这两个脉冲序列和通过取原始脉冲序列的补码获得的两个脉冲序列（y，y'）被施加到一对桥接电路（A，B）。 负载（32）连接到两个桥接电路。 两个桥接电路被配置成使得当存在来自第一或第二脉冲串的脉冲时，整个负载上不会出现净电压。 在所有其他时间，基本上整个电源电压施加在负载上。 在另一个实施例中，跨越负载连接n对桥接电路。 使用在时间上偏移的抖动信号产生脉冲串。 一对桥接电路的脉冲串从下一对移位t / 2n，其中t是抖动信号的周期。 负载中有效纹波电流越大n越小。 本发明特别适用于控制磁共振成像系统中的梯度线圈。

公开(公告)号：EP0696103A1

公开(公告)日：1996-02-07

申请号：EP95420223.0

申请日：1995-08-01

申请人： Performance Controls, Inc.

发明人： Goff, Jerry K.

IPC分类号： H02P6/00

CPC分类号： H02P27/05 ,  H02P6/08 ,  H02P25/20

摘要： A high-speed constant-horsepower motor includes a rotor and a stator having a plurality of groups of windings which are separately driven. In one mode of operation, the polarity of the voltage applied to each winding is such that the windings behave as distinct electromagnets, each defining a separate magnetic pole. In another mode of operation, the polarity of voltage applied to some of the windings is reversed, such that pairs of adjacent windings behave as single electromagnets. In the latter mode, the effective number of magnetic poles is reduced by a factor of two. Thus, the effective number of magnetic poles of the motor can be varied electronically, even while the motor is operating. The invention makes it possible, in one example, to operate the motor as an eight-pole motor at low speeds, and as a four-pole motor at high speeds. The effective motor constants are changed appropriately from eight-pole to four-pole modes. The invention also includes a circuit which minimizes the number of slip rings (50, 51), or other power transferring devices, required to implement the above-described invention on the windings of the rotor.

摘要翻译： 高速恒马力电动机包括转子和定子，所述转子和定子具有分别驱动的多组绕组。 在一种操作模式中，施加到每个绕组的电压的极性使得绕组表现为不同的电磁体，每个电磁体限定单独的磁极。 在另一种操作模式中，施加到一些绕组的电压的极性是相反的，使得相邻的绕组对表现为单个电磁体。 在后一种模式中，磁极的有效数目减少了2倍。 因此，马达的有效磁极数量可以以电子方式变化，即使在马达运转时也是如此。 本发明在一个示例中使得可以以低速操作电动机作为八极电动机，并且以高速度作为四极电动机。 有效的电机常数从八极到四极模式适当改变。 本发明还包括使在实施上述发明所需的转子的绕组上的滑环（50,51）或其它动力传递装置的数目最小化的电路。 $$

公开(公告)号：EP0696103B1

公开(公告)日：1999-09-08

申请号：EP95420223.0

申请日：1995-08-01

申请人： Performance Controls, Inc.

发明人： Goff, Jerry K.

IPC分类号： H02P6/00

CPC分类号： H02P27/05 ,  H02P6/08 ,  H02P25/20

公开(公告)号：EP0470499A2

公开(公告)日：1992-02-12

申请号：EP91112898.1

申请日：1991-07-31

申请人： Performance Controls, Inc.

发明人： Goff, Jerry K.

IPC分类号： H02M7/5387

CPC分类号： H02M7/493 ,  H02M7/5387 ,  H02M7/53871

摘要： A pulse-width modulated (PWM) circuit applies a voltage across a load (32) in accordance with a PWM command signal (I). The command signal (I) is converted into first and second trains of pulses (x, x'), by electronically comparing the command signal with a triangular dither signal (D) and also with the dither signal which has been shifted by half its period. These two pulse trains, and two more pulse trains (y, y) obtained by taking the complements of the original pulse trains, are applied to a pair of bridge circuits (A, B). The load (32) is connected to both bridge circuits. Both bridge circuits are configured such that when a pulse is present, from either the first or the second pulse train, no net voltage appears across the load. At all other times, substantially the entire power supply voltage is applied across the load. In another embodiment, n pairs of bridge circuits are connected across the load. The pulse trains are generated using dither signals which are shifted in time. The pulse trains of one pair of bridge circuits are shifted from the next pair by t/2n, where t is the period of the dither signal. The greater n, the less the effective ripple current in the load. The invention is especially suitable for use in controlling gradient coils in a magnetic resonance imaging system.

摘要翻译： 脉冲宽度调制（PWM）电路根据PWM命令信号（I）在负载（32）两端施加电压。 通过将命令信号与三角形抖动信号（D）进行电子比较，并将抖动信号偏移一半的周期，将命令信号（I）转换为第一和第二脉冲序列（x，x'） 。 这两个脉冲序列和通过取原始脉冲序列的补码获得的两个脉冲序列（y，y'）被施加到一对桥接电路（A，B）。 负载（32）连接到两个桥接电路。 两个桥接电路被配置成使得当存在来自第一或第二脉冲串的脉冲时，整个负载上不会出现净电压。 在所有其他时间，基本上整个电源电压施加在负载上。 在另一个实施例中，跨越负载连接n对桥接电路。 使用在时间上偏移的抖动信号产生脉冲串。 一对桥接电路的脉冲串从下一对移位t / 2n，其中t是抖动信号的周期。 负载中有效纹波电流越大n越小。 本发明特别适用于控制磁共振成像系统中的梯度线圈。

公开(公告)号：EP0428078A3

公开(公告)日：1991-10-23

申请号：EP90121462.7

申请日：1990-11-09

申请人： Performance Controls, Inc.

发明人： Goff, Jerry K.

IPC分类号： H02M7/5387

CPC分类号： H02M7/5387

摘要： A pulse-width modulated circuit applies a voltage (+V) across a load (32) in accordance with a command signal (I). The command signal is con­verted into first and second trains of pulses (x, x′), by electronically comparing the command signal, and its inverse, with a triangular dither signal (38). These two pulse trains (x, x′), and two more pulse trains ( y , y′) obtained by taking the complements of the original pulse trains, are applied to a pair of bridge circuits (48, 50). The load is connected to both bridge circuits. Both bridge circuits include electronic switch­ing devices (60, 62, 64, 66, 68, 70, 72, 74) actuated by the pulses. The bridge circuits are configured such that when a pulse is present, from either the first or the second pulse train, no net voltage appears across the load. At all other times, substantially the entire power supply voltage is applied across the load. Compared to pulse-width modulated circuits of the prior art, having similar pulse frequencies and power supplies, the present circuit reduces the undesirable effects of current ripple through the load by a factor of four. This reduction is due to the use of two alternating pulse trains, which doubles the effective fre­quency of pulses, and to the fact that the maximum voltage excursion of the signal across the load is no greater than the absolute value of the maximum power supply voltage available. As a result, the present circuit has a much higher bandwidth than circuits of the prior art having compa­rable voltage and frequency parameters.

公开(公告)号：EP0171415B1

公开(公告)日：1990-05-09

申请号：EP85900907.8

申请日：1985-01-25

申请人： PERFORMANCE CONTROLS, INC.

发明人： GOFF, Jerry, K. ,  MARINKO, Joseph, A., Jr. ,  VENDITTO, Joseph, G., Jr. ,  YOST, Donald, A.

IPC分类号： H02M7/02

CPC分类号： C12Q1/6834 ,  G01N33/532 ,  G01N33/558 ,  H02M7/219 ,  H02M7/53871 ,  H02M2001/0009 ,  H02M2001/385

摘要： An apparatus for use with an amplifier (51-56) regulates the current through a load (35) according to a drive signal (93) having first and second states and comprises switchless sensing means (62, 64) and polarity correction means (66, 68). The switchless sensing means (62, 64) provides a sense signal continuously representative of the magnitude of the current through the load (35) without the use of switching circuitry. The polarity correction means is directly coupled to the sensing means (62, 64) and receives the sense signal and is responsive to the status of the drive signal (93) for providing an analog signal (102) continuously representative of both the instantaneous magnitude and polarity of the current through the load.

公开(公告)号：EP0239026A3

公开(公告)日：1989-10-11

申请号：EP87104119.0

申请日：1987-03-20

申请人： Performance Controls, Inc.

发明人： Goff, Jerry K. ,  Chizever, Gary E.

IPC分类号： G01D5/247 ,  H02P6/02 ,  G01D5/245

CPC分类号： H02P6/16 ,  G01D5/247 ,  H02P6/15

摘要： Analog sensors generate phase-displaced analog signals responsive to the angular position of a shaft. A logic circuit (12) produces a digital code indicating the region of the cycle in which the shaft is instantaneously located. An analog multiplexor (14) selects a unique pair of analog signals according to the value of the digital code. An analog to digital converter (16, 26) then generates a digital signal used to activate an address in a memory (28). As the shaft turns, the addresses in the memory (28) are activated in a predetermined order to produce trains of pulses indicating angular velocity, direction as well as displacement of the shaft, and commutation pulses, for controlling a brushless motor. The apparatus therefore can be used to monitor the angular displacement of the shaft and, at the same time, to control the motor which drives that shaft.

公开(公告)号：EP0239026A2

公开(公告)日：1987-09-30

申请号：EP87104119.0

申请日：1987-03-20

申请人： Performance Controls, Inc.

发明人： Goff, Jerry K. ,  Chizever, Gary E.

IPC分类号： G01D5/247 ,  H02P6/02 ,  G01D5/245

CPC分类号： H02P6/16 ,  G01D5/247 ,  H02P6/15

摘要： Analog sensors generate phase-displaced analog signals responsive to the angular position of a shaft. A logic circuit (12) produces a digital code indicating the region of the cycle in which the shaft is instantaneously located. An analog multiplexor (14) selects a unique pair of analog signals according to the value of the digital code. An analog to digital converter (16, 26) then generates a digital signal used to activate an address in a memory (28). As the shaft turns, the addresses in the memory (28) are activated in a predetermined order to produce trains of pulses indicating angular velocity, direction as well as displacement of the shaft, and commutation pulses, for controlling a brushless motor. The apparatus therefore can be used to monitor the angular displacement of the shaft and, at the same time, to control the motor which drives that shaft.

摘要翻译： 模拟传感器生成响应于一个轴的角位置相移位的模拟信号。 的逻辑电路（12）产生的数字代码指示其中所述轴被瞬间位于该周期的区域。 选择唯一的一对模拟信号gemäß的在模拟多路复用所述数字码（14）的值。 到数字转换器（16，26）的模拟然后生成速率用于激活在存储器（28），以解决数字信号。 当轴转动时，在存储器（28）中的地址以预定的顺序，从而生成表示角速度脉冲序列，方向以及所述轴的位移，以及换向脉冲，用于控制无刷电机被激活。 该装置因此可被用于监测轴的角位移，并且在同一时间，以控制其驱动做轴电机。

公开(公告)号：EP0428078A2

公开(公告)日：1991-05-22

申请号：EP90121462.7

申请日：1990-11-09

申请人： Performance Controls, Inc.

发明人： Goff, Jerry K.

IPC分类号： H02M7/5387

CPC分类号： H02M7/5387

摘要： A pulse-width modulated circuit applies a voltage (+V) across a load (32) in accordance with a command signal (I). The command signal is con­verted into first and second trains of pulses (x, x′), by electronically comparing the command signal, and its inverse, with a triangular dither signal (38). These two pulse trains (x, x′), and two more pulse trains ( y , y′) obtained by taking the complements of the original pulse trains, are applied to a pair of bridge circuits (48, 50). The load is connected to both bridge circuits. Both bridge circuits include electronic switch­ing devices (60, 62, 64, 66, 68, 70, 72, 74) actuated by the pulses. The bridge circuits are configured such that when a pulse is present, from either the first or the second pulse train, no net voltage appears across the load. At all other times, substantially the entire power supply voltage is applied across the load. Compared to pulse-width modulated circuits of the prior art, having similar pulse frequencies and power supplies, the present circuit reduces the undesirable effects of current ripple through the load by a factor of four. This reduction is due to the use of two alternating pulse trains, which doubles the effective fre­quency of pulses, and to the fact that the maximum voltage excursion of the signal across the load is no greater than the absolute value of the maximum power supply voltage available. As a result, the present circuit has a much higher bandwidth than circuits of the prior art having compa­rable voltage and frequency parameters.

摘要翻译： 脉冲宽度调制电路根据命令信号（I）在负载（32）之间施加电压（+ V）。 通过将命令信号及其反相电路与三角形抖动信号（38）进行电子比较，将命令信号转换为第一和第二列脉冲（x，x min）。 将这两个脉冲序列（x，x min）和通过取原始脉冲序列的补码获得的两个脉冲序列（y，y min）施加到一对桥接电路（48,50）。 负载连接到两个桥接电路。 两个桥接电路包括由脉冲驱动的电子开关器件（60,62,64,66,68,70,72,74）。 桥接电路被配置为使得当存在来自第一或第二脉冲串的脉冲时，整个负载上不会出现净电压。 在所有其他时间，基本上整个电源电压施加在负载上。 与现有技术的脉冲宽度调制电路相比，具有类似的脉冲频率和电源，本电路将电流纹波通过负载减少四倍的不良影响。 这种减少是由于使用两个交替的脉冲串，其使脉冲的有效频率加倍，并且跨越负载的信号的最大电压偏移不大于可用的最大电源电压的绝对值 。 结果，本电路具有比具有可比较的电压和频率参数的现有技术的电路高得多的带宽。