公开(公告)号：US5619109A

公开(公告)日：1997-04-08

申请号：US477458

申请日：1995-06-07

Applicant: Scott W. Cameron ,  Karl M. Schlager

Inventor： Scott W. Cameron ,  Karl M. Schlager

IPC: H02P6/18 ,  H02P6/24 ,  H02P3/10

CPC classification number: H02P6/24

Abstract: A method and circuit for braking a forward rotation of a rotor of a polyphase DC motor. A commutation sequencer is incremented by several phases to produce an incremented commutation sequence to produce a magnetic flux vector that lags a magnetic pole of the motor. Driving currents are applied to coils of the motor in accordance with the incremented commutation sequence to brake the rotor. The method is implemented in a circuit that has a sequencer for incrementally generating sets of commutation signals to select stator coils for energization to rotate the rotor. A power stage to which the commutation signals are applied energizes the selected coils in accordance with the commutation signals. A circuit interrupts the energization of the selected coils and the commutation sequence is altered to produce a sequence that produces a negative torque on the rotor. Circuits are also provided to inhibit application of the altered commutation sequence until recirculation currents in the power stage caused by the coils in response to the reduction of the input voltage have fallen below a predetermined level, and to inhibit application of the altered commutation sequence until a voltage on a sense resistor between the power stage and a reference potential has fallen below a predetermined level after an operation of the circuit for interrupting the energization of the selected coils.

Abstract translation: 一种用于制动多相直流电动机的转子正转的方法和电路。 换向序列发生器增加多个相位以产生递增的换向序列，以产生滞后于电机的磁极的磁通矢量。 根据递增的换向顺序将驱动电流施加到电动机的线圈以制动转子。 该方法在具有用于增量地产生换向信号组的定序器的电路中实现，以选择用于激励转子的定子线圈。 施加换向信号的功率级根据换向信号激励所选择的线圈。 A电路中断所选择的线圈的通电，改变换向序列以产生在转子上产生负转矩的序列。 还提供电路以阻止改变的换向序列的应用，直到响应于输入电压的降低而由线圈引起的再循环电流已经降低到预定水平以下并且阻止改变的换向序列的应用直到 功率级与参考电位之间的检测电阻上的电压在用于中断所选择的线圈的通电的电路的操作之后已经下降到预定水平以下。

公开(公告)号：US5546030A

公开(公告)日：1996-08-13

申请号：US366793

申请日：1994-12-30

Applicant: Scott W. Cameron

Inventor： Scott W. Cameron

IPC: G11B5/09 ,  G11B5/00 ,  G11B5/012 ,  G11B5/02 ,  H03F3/45 ,  H03K17/66 ,  H03K3/00 ,  G06G7/12 ,  H03L5/00

CPC classification number: G11B5/022 ,  G11B5/012 ,  G11B5/02 ,  H03K17/662 ,  G11B2005/0013 ,  G11B2005/0016

Abstract: An innovative circuit for driving the write head. All of the driving transistors are NPN, and are prevented from saturation. This is achieved by shifting and scaling down the differential drive applied to the pull-up transistors, to drive the pull-down transistors with levels such that the pull-down transistors cannot reach saturation. This provides a very simple circuit in which all four of the drive transistors are NPN, and all are kept out of saturation. Moreover, the peak write current applied to the head is precisely limited.

Abstract translation: 用于驱动写入头的创新电路。 所有的驱动晶体管均为NPN，防止饱和。 这是通过移位和缩小施加到上拉晶体管的差分驱动来实现的，以便使下拉晶体管不能达到饱和的水平驱动下拉晶体管。 这提供了一个非常简单的电路，其中所有四个驱动晶体管都是NPN，并且全部都保持不饱和。 此外，施加到头部的峰值写入电流被精确地限制。

公开(公告)号：US5317243A

公开(公告)日：1994-05-31

申请号：US923237

申请日：1992-07-31

Applicant: Scott W. Cameron

Inventor： Scott W. Cameron

IPC: H02P6/12 ,  H02P6/18 ,  H02P5/06

CPC classification number: H02P6/182 ,  H02P6/12

Abstract: A circuit and method for operating a polyphase dc motor of the type having a plurality of driving coils that are commutatively energized in a predetermined sequence to rotate a rotor has a zero crossing detector connected to determine when a back emf of a floating driving coil crosses zero. A generator for generating commutation sequence signals controls which of said driving coils are energized a delayed time after said zero crossing detector detects that a back emf of a floating driving coil has crossed zero. A mask circuit inhibits said zero crossing detector for a delayed time after a commutation change, in dependence upon an acceleration of the rotor. Also, a circuit is provided for adjusting the commutation delay time after a back emf of a floating one of said coils crosses zero, in dependence upon the acceleration of the rotor.

Abstract translation: 用于操作具有多个驱动线圈的多相直流电动机的电路和方法，所述多相直流电动机以预定顺序换向通电以旋转转子，具有连接的过零检测器，以确定浮动驱动线圈的反电动势何时超过零 。 用于产生换向序列信号的发生器控制在所述过零点检测器检测到浮动驱动线圈的反电动势已经超过零之后的延迟时间中激励所述驱动线圈中的哪一个。 屏蔽电路根据转子的加速度在换向改变之后抑制所述过零检测器的延迟时间。 而且，提供电路，用于根据转子的加速度，在所述线圈中的一个浮动的一个的后电动势与零相交之后调节换向延迟时间。

公开(公告)号：US6094026A

公开(公告)日：2000-07-25

申请号：US191060

申请日：1994-02-02

Applicant: Scott W. Cameron

Inventor： Scott W. Cameron

IPC: G08B21/00 ,  H02H5/04 ,  H02H7/08 ,  H02H7/085 ,  H02P6/00 ,  H02P6/08 ,  H02P6/12 ,  H02P1/04

CPC classification number: H02H7/0833 ,  H02P6/085 ,  H02P6/34 ,  H02H5/044 ,  H02H7/0858

Abstract: A method and integrated circuit for providing drive signals to a polyphase dc motor. The integrated circuit is fabricated on a semiconductor substrate for providing drive signals to a polyphase dc motor. The circuit includes a coil drive circuit for connection to drive coils of the motor to selectively supply drive currents thereto in a predetermined sequence. A sequencer circuit commutatively selects the drive coils to which the drive currents are selectively supplied, and a motor, speed controlling circuit controls the speed of the motor by controlling the speed of commutation. A temperature sensing element, such as a diode, is fabricated in the substrate to indicate the temperature of the substrate, and a temperature measuring circuit is connected to the temperature sensing element and to the motor speed controlling circuit to operate the motor speed controlling circuit to slow the speed of the motor when the temperature of the substrate exceeds a first predetermined temperature. If desired, temperature measuring circuit can include a circuit for measuring a second temperature higher than the first predetermined temperature to operate a shut down circuit to turn off the motor if the substrate temperature is too high.

Abstract translation: 一种用于向多相直流电动机提供驱动信号的方法和集成电路。 集成电路制造在半导体衬底上，用于向多相直流电动机提供驱动信号。 该电路包括用于连接到电动机的驱动线圈的线圈驱动电路，以预定的顺序选择性地提供驱动电流。 定序器电路对选择性地提供驱动电流的驱动线圈进行换相选择，电动机，速度控制电路通过控制换向速度来控制电动机的转速。 在衬底中制造诸如二极管的温度感测元件以指示衬底的温度，并且温度测量电路连接到温度感测元件和电动机速度控制电路，以将电动机速度控制电路操作为 当基板的温度超过第一预定温度时，减慢马达的速度。 如果需要，温度测量电路可以包括用于测量高于第一预定温度的第二温度的电路，以便如果衬底温度太高，则操作关闭电路以关闭电动机。

公开(公告)号：US5557180A

公开(公告)日：1996-09-17

申请号：US85507

申请日：1993-06-30

Applicant: Scott W. Cameron

Inventor： Scott W. Cameron

IPC: H02P6/18 ,  H02P6/08 ,  H02P6/20 ,  H02P1/18

CPC classification number: H02P6/085 ,  H02P6/21

Abstract: A circuit and method for operating a polyphase dc motor of the type having a plurality of driving coils connected together at a center tap current input node. Each driving coil have a current input node at an end opposite the center tap connection. A plurality of pairs of switches are arranged for connection in series across a power supply voltage. Each pair have a connection node between each switch connected to a respective one of the current input nodes. A sequencer individually operates the switches to cause a driving current to be passed between sequentially selected only single ones of the driving coils and the center tap current input node.

Abstract translation: 一种用于操作具有在中心抽头电流输入节点处连接在一起的多个驱动线圈的类型的多相直流电动机的电路和方法。 每个驱动线圈在与中心抽头连接相对的端部处具有电流输入节点。 多对开关被布置成用于跨电源电压串联连接。 每对在每个交换机之间具有连接到相应的一个当前输入节点的连接节点。 定序器分别操作开关以使得驱动电流在顺序选择的单个驱动线圈和中心抽头电流输入节点之间通过。

公开(公告)号：US5221881A

公开(公告)日：1993-06-22

申请号：US770576

申请日：1991-10-03

Applicant: Scott W. Cameron

Inventor： Scott W. Cameron

IPC: H02P6/12 ,  H02P6/18

CPC classification number: H02P6/12 ,  H02P6/182

Abstract: A circuit for operating a polyphase dc motor, for example of the type having a plurality of "Y" connected stator coils, has circuitry for unambiguously determining the actual instantaneous position of the rotor of the motor, circuitry for determining a desired rotor position precedent to executing a desired commutation sequence, and circuitry for executing the desired commutation sequence when the circuit for determining the actual instantaneous position of the rotor detects that the rotor is actually in the desired rotor position. The circuitry for unambiguously determining the actual instantaneous position of the rotor includes a back emf amplifier switchably connected to at least one floating coil in accordance with sequence signals received directly from a sequence generator, and circuitry for determining when the voltage received by the back emf amplifier crosses zero from a predetermined direction. In one embodiment, the circuit includes mask circuitry for inhibiting the zero crossing detection circuitry for a predetermined time after a change in the commutation sequence. The mask circuitry includes clocked up and first and second down counters, the second down counter being inhibited to be clocked until the first down counter has reached a predetermined count, and the zero crossing circuitry being inhibited until at least the second down counter has completed its count. When a zero crossing is detected, the count of the up counter is loaded into both the first and second down counter, then the up counter is reset to begin a new commutation period count.

Abstract translation: 用于操作多相直流电动机的电路，例如具有多个“Y”个连接的定子线圈的类型的电路具有用于明确地确定电动机的转子的实际瞬时位置的电路​​，用于确定期望的转子位置先例的电路 执行期望的换向序列，以及用于当用于确定转子的实际瞬时位置的电路​​检测到转子实际上处于期望的转子位置时执行所需换向序列的电路。 用于明确地确定转子的实际瞬时位置的电路​​包括根据从序列发生器直接接收的顺序信号切换地连接到至少一个浮动线圈的反电动势放大器，以及用于确定由反电动势放大器接收的电压何时的电路 从预定方向穿过零。 在一个实施例中，电路包括用于在换向序列改变之后的预定时间内禁止过零检测电路的掩模电路。 掩模电路包括时钟提供和第一和第二下计数器，第二向下计数器被禁止被计时直到第一递减计数器达到预定计数，并且过零电路被禁止，直到至少第二向下计数器已经完成其 计数。 当检测到零交叉时，向上计数器的计数被加载到第一和第二递减计数器中，然后上升计数器被复位以开始新的换向周期计数。

公开(公告)号：US5172036A

公开(公告)日：1992-12-15

申请号：US773725

申请日：1991-10-09

Applicant: Scott W. Cameron

Inventor： Scott W. Cameron

IPC: H02P6/18 ,  H02P6/06 ,  H02P6/14

CPC classification number: H02P6/14 ,  H02P6/06

Abstract: A circuit for resynchronizing the rotor of a polyphase dc motor having "Y" connected stator coils and a moving rotor has circuitry for determining the actual instantaneous position of the rotor, and circuitry for determining a desired rotor position precedent to executing a desired commutation sequence. Circuitry is provided for executing the desired commutation sequence when the circuit for determining the actual instantaneous position of the rotor detects that the rotor is actually in the desired rotor position, and circuitry is provided, responsive to a predetermined resynchronize signal such as an output enable signal, an overtemperature indicating signal, any other signal indicating abnormal operation condition of the motor or the driver circuit, or the like, (1) for inhibiting drive signals to the driving coils, (2) for initiating a resynchronizing routine to synchronize the position of the rotor to the desired commutation sequence, and (3) for reapplying drive signals to the coils after the position of the rotor of the motor has been synchronized with the desired commutation sequence.

公开(公告)号：US5572097A

公开(公告)日：1996-11-05

申请号：US275645

申请日：1994-07-15

Applicant: Scott W. Cameron

Inventor： Scott W. Cameron

IPC: H02P6/12 ,  H02P6/18 ,  H02K23/00

CPC classification number: H02P6/182 ,  H02P6/12

Abstract: In a method for aligning a rotor of a polyphase dc motor in preparation for starting the motor. a first energization signal is applied to field coils of the motor in a first predetermined phase for a first predetermined time. Then, a second energization signal having a second predetermined phase displaced from the first phase by a predetermined amount is applied to the field coils for a second predetermined time period. In one embodiment, the second energization signal is applied to produce a maximum torque upon the rotor when the rotor is positioned at a location determined by the first energization signal. In the case of a three phase motor, the second energization signal is displaced by two commutations from the first energization signal. Circuitry for aligning a rotor of a polyphase dc motor in preparation for startup is also presented having circuitry for applying a first signal to selected field coils of the polyphase dc motor having a first commutative phase for a first predetermined time, and circuitry for applying a second signal to other selected field coils of the polyphase dc motor having a second commutative phase for a second predetermined time.

Abstract translation: 在用于对准多相直流电动机的转子以准备起动电动机的方法中。 第一通电信号以第一预定相位施加到电动机的励磁线圈第一预定时间。 然后，将具有从第一相位移位预定量的第二预定相位的第二通电信号施加到励磁线圈第二预定时间段。 在一个实施例中，当转子位于由第一通电信号确定的位置时，施加第二通电信号以在转子上产生最大转矩。 在三相电动机的情况下，第二通电信号从第一通电信号移位两个换向。 还提出了用于对准用于启动的多相直流电动机的转子的电路，其具有用于将第一信号施加到具有第一预定时间的第一交换相位的多相直流电动机的选定励磁线圈的电路，以及用于施加第二 信号到多相直流电动机的其它选定的励磁线圈，具有第二预定时间的第二交换相位。

公开(公告)号：US5517095A

公开(公告)日：1996-05-14

申请号：US395646

申请日：1995-02-28

Applicant: Francesco Carobolante ,  Scott W. Cameron

Inventor： Francesco Carobolante ,  Scott W. Cameron

IPC: H02P6/12 ,  H02P6/18

CPC classification number: H02P6/12 ,  H02P6/182

Abstract: A method and circuit for operating a polyphase dc motor having a plurality of driving coils is presented. In one of the available operating modes, drive current supplied to the driving coils is chopped, in PWM fashion to control the maximum current delivered thereto by turning the drive current on and off. Zero crossings of a back emf voltage of the driving coils that are connected into a floating state are detected for producing a commutation signal, and the detection of zero crossings is inhibited for a predetermined time after the drive current is turned off during the chopping step to avoid detecting a false zero crossing. In normal operation, detected back emf sampled voltages are forwarded to back emf detection circuitry responsive to a high frequency clock.

Abstract translation: 提出了一种用于操作具有多个驱动线圈的多相直流电动机的方法和电路。 在可用的操作模式之一中，驱动线圈的驱动电流以PWM的方式被切断，以通过打开和关闭驱动电流来控制传递到其的最大电流。 检测连接到浮置状态的驱动线圈的反电动势电压的零交叉以产生换向信号，并且在切断步骤中驱动电流关断之后的预定时间内禁止过零点检测到 避免检测到虚假的过零点。 在正常操作中，响应于高频时钟，检测到的反电动势采样电压被转发到反电动势检测电路。

公开(公告)号：US5294877A

公开(公告)日：1994-03-15

申请号：US876871

申请日：1992-04-30

Applicant: Scott W. Cameron

Inventor： Scott W. Cameron

IPC: H02P6/12 ,  H02P6/18 ,  H02P5/28

CPC classification number: H02P6/12 ,  H02P6/182

Abstract: A circuit for operating a polyphase dc motor includes first circuitry for determining when the back emf of the floating driving coils crosses zero. A first counter counts a time period between a first set of zero crossings, and a second counter is loaded with the count reached by the first counter. The second counter counts a time period between a subsequently occurring set of zero crossings. If the second counter reaches zero before the occurrence of a third zero crossing, a warning signal is generated. A method for determining if a deceleration rate of a polyphase dc motor exceeds a predetermined threshold includes measuring a first period between a first set of zero crossings of the back emf of the floating driving coils, and comparing the measurement of the first period with a subsequent period between a subsequent set of zero crossings. If the subsequent period is larger than the first period by a predetermined amount a warning signal is produced. The first period is measured by counting up from zero at a first predetermined rate from a first zero crossing until a second zero crossing occurs. The comparison of the measurement of the first period with a subsequent period is done by counting down at a second predetermined rate from the count reached in the up count when the second zero crossing occurred. And the warning signal is produced if the down count reaches a zero before a third zero crossing occurs.

Abstract translation: 用于操作多相直流电动机的电路包括用于确定浮动驱动线圈的反电动势何时超过零的第一电路。 第一计数器计数第一组零交叉之间的时间段，并且第二计数器加载由第一计数器达到的计数。 第二计数器计数随后发生的一组零交叉之间的时间段。 如果在发生第三个过零点之前第二个计数器达到零，则产生警告信号。 一种用于确定多相直流电动机的减速度是否超过预定阈值的方法包括：测量浮动驱动线圈的背面电动势的第一组零交叉之间的第一周期，以及将第一周期的测量与随后的 在后一组零交叉之间的时间段。 如果随后的周期大于第一周期预定量，则产生警告信号。 通过以第一预定速率从零开始从第一过零点向上计数直到发生第二零交叉来测量第一周期。 当第二个零交叉发生时，通过以递增计数中达到的计数以第二预定速率向下计数来进行第一周期与后续周期的测量的比较。 如果在发生第三个零交叉之前下降计数达到零，则产生警告信号。