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公开(公告)号：US20220399839A1
公开(公告)日：2022-12-15
申请号：US17776577
申请日：2020-06-30
摘要： AC motor rotates independent from power frequency gives advantages in size and controllability. Oscillating and rotating magnetic field is created across airgap by using Amplitude Modulated input. Higher frequency (Carrier) is the power input and the lower frequency (Signal) determines speed of the motor. Stator and Rotor work as primary and secondary of transformer, rotor windings are arranged to keep resultant EMF generated within the winding as zero when rotor aligned with stator magnetic field and increase when deviates. The current generated on deviated rotor winding creates a push back torque keeping the rotor aligned with magnetic field. This interlocks magnetic field and the rotor. Two different frequencies are applied at either end of the stator windings so that the current flow through each winding become amplitude modulated, average of the two frequencies become carrier frequency and control frequency is half of the difference between two frequencies.
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2.发明授权公开(公告)号：US11245347B2
公开(公告)日：2022-02-08
申请号：US16798641
申请日：2020-02-24
申请人： ROHM CO., LTD.
摘要： The present invention relates to a driving circuit and a driving method for a stepping motor, and an electronic machine using the same. A current value setting circuit generates a current setting value. A constant current chopper circuit generates a pulse modulation signal, which pulse-width modulates by having a detection value of a coil current flowing through a coil approach close to the current setting value. A logic circuit controls a bridge circuit connected to the coil of the stepping motor according to the pulse modulation signal. The current value setting circuit sets the current setting value to a predetermined full-torque setting value in a first period after rotation starts, reduces the current setting value to a predetermined second setting value less than the first setting value in the following second period, and switches to a high-efficiency mode and adjusts the current setting value by means of feedback control.
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公开(公告)号：US20200313583A1
公开(公告)日：2020-10-01
申请号：US16801816
申请日：2020-02-26
摘要： A motor driving apparatus including a driving circuit for supplying a first pulse with which a first coil included in a two-phase stepping motor generates a first magnetic flux, a second pulse with which a second coil included in the stepping motor generates a second magnetic flux opposite to the first magnetic flux, a third pulse with which the first coil generates the second magnetic flux, and a fourth pulse with which the second coil generates the first magnetic flux, to the stepping motor. The driving circuit supplies the second pulse, the third pulse, and the fourth pulse in this order to the stepping motor in a state of being stopped to start the stepping motor, and supplies the first pulse, the second pulse, the third pulse, and the fourth pulse in this order to the stepping motor after starting to continuously drive the stepping motor.
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4.发明申请公开(公告)号：US20200280272A1
公开(公告)日：2020-09-03
申请号：US16798812
申请日：2020-02-24
申请人： ROHM CO., LTD.
摘要： The task of the present invention is to provide a driving circuit capable of outputting information useful to design or control of a system to outside. The present invention relates to a driving circuit and a driving method of a stepping motor, and an electronic machine using the driving circuit of a stepping motor. A counter electromotive force detection circuit detects a counter EMF generated in a coil. A revolution count detection circuit acquires the revolution count of the stepping motor. A load angle estimating portion calculates a load angle according to the counter EMF and the revolution count. An interface circuit is configured to be capable of outputting angle information associated with the load angle to outside, or accessing the angle information from the outside.
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公开(公告)号：US20170373622A1
公开(公告)日：2017-12-28
申请号：US15538823
申请日：2015-12-25
申请人： Minebea Mitsumi Inc.
发明人： Hidetoshi Hijikata
IPC分类号： H02P8/22 , H02P29/032 , H02P8/12 , H02P7/03 , H02M7/5387 , H02P7/29 , H02P8/18 , H02M3/155
摘要： This motor control device has an inexpensive configuration and enhances motor current target value tracking. This motor control device has an H bridge circuit that has a switching element and is connected to a motor coil provided in a motor, and a control means that drives the switching element at each prescribed PWM period and specifies an operation mode for the H bridge circuit from among a charge mode for increasing the motor current (Icoil) flowing through the motor coil, a fast decay mode for decreasing the motor current, and a slow decay mode. In each PWM period, the control means selects one of the operation modes on the basis of the result of comparing the motor current and a current reference value (Iref) before the time that has passed from the start of the PWM period reaches a prescribed current control re-execution time (Tr) and selects one of the operation modes on the basis of the result of comparing the motor current and the current reference value after the time that has passed reaches the current control re-execution time.
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公开(公告)号：US09787234B2
公开(公告)日：2017-10-10
申请号：US15093220
申请日：2016-04-07
申请人： MINEBEA CO., LTD.
发明人： Sakae Fujitani , Nobuyuki Sueyoshi
摘要： A drive controller of an instrument controls a stepping motor to rotate a pointer of the instrument attached to a rotation shaft of the stepping motor, the pointer rotatable between a zero scale position and a maximum scale position. The drive controller controls the stepping motor to perform a sweeping operation in which the pointer is swung from the zero scale position to the maximum scale position and returned back to the zero scale position, wherein the drive controller controls the stepping motor, during the sweeping operation, to accelerate to a predetermined speed by outputting a rated torque signal to the stepping motor and controls the stepping motor to rotate at the predetermined speed by outputting a decreased torque signal to the stepping motor, the decreased torque signal being lower than the rated torque signal.
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公开(公告)号：US09503005B2
公开(公告)日：2016-11-22
申请号：US13965812
申请日：2013-08-13
发明人： Teruhiko Ueyama
摘要： A motor control device includes a drive unit configured to rotate a rotor by supplying a drive signal with periodical changes to a coil; a detection unit configured to output a signal that is changed in association with a rotation of the rotor; and a control unit configured to control the drive signal supplied by the drive unit in accordance with the signal output from the detection unit, wherein the control unit performs a first control and a second control so as to achieve a target rotation velocity of the rotor, and wherein the first control is a control for controlling the rotation velocity of the rotor by controlling an advance angle of the drive signal with periodical changes and the second control is a control for controlling the rotation velocity of the rotor by controlling a voltage for supplying the drive signal.
摘要翻译： 电动机控制装置包括：驱动单元，被配置为通过向线圈提供具有周期性变化的驱动信号来旋转转子; 检测单元，被配置为输出与转子的旋转相关联地改变的信号; 以及控制单元，被配置为根据从检测单元输出的信号来控制由驱动单元提供的驱动信号，其中控制单元执行第一控制和第二控制以实现转子的目标转速， 并且其中，所述第一控制是通过控制所述驱动信号的周期性变化的提前角来控制所述转子的旋转速度的控制，并且所述第二控制是通过控制所述转子的电压来控制所述转子的转速的控制 驱动信号。
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公开(公告)号：US20160315571A1
公开(公告)日：2016-10-27
申请号：US15133584
申请日：2016-04-20
申请人： Rohm Co., Ltd.
发明人： Hiroki Hashimoto , Ryoichi Inoue
IPC分类号： H02P8/18
CPC分类号： H02P8/18
摘要： A motor driving device and driving method of the same used to surely suppress the influence of counter electromotive force is provided. The motor driving device 100 includes an auto-decay portion 141. The auto-decay portion 141 controls a path of a electric current flow in a motor coil when supplying the electric current and when decaying the electric current. The influence of counter electromotive force generated in a stepping motor 200 can be suppressesed by the auto-decay portion 141 configured to control so that a ratio or an decay time of a slow decay mode and a fast decay mode of previous cycle is different from a ratio or an decay time of the slow decay mode and the fast decay mode of current cycle.
摘要翻译： 提供了一种用于可靠地抑制反电动势的影响的电动机驱动装置及其驱动方法。 电动机驱动装置100包括自动衰减部141.自动衰减部141在供给电流时以及衰减电流时，控制电动机线圈中的电流的路径。 在步进电机200中产生的反电动势的影响可以被配置为控制的自动衰减部分141抑制，使得前一周期的慢衰减模式和快速衰减模式的比率或衰减时间不同于 比例或慢衰减模式的衰减时间和当前周期的快速衰减模式。
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公开(公告)号：US20160301343A1
公开(公告)日：2016-10-13
申请号：US15093220
申请日：2016-04-07
申请人： MINEBEA CO., LTD.
发明人： Sakae FUJITANI , Nobuyuki SUEYOSHI
摘要： A drive controller of an instrument controls a stepping motor to rotate a pointer of the instrument attached to a rotation shaft of the stepping motor, the pointer rotatable between a zero scale position and a maximum scale position. The drive controller controls the stepping motor to perform a sweeping operation in which the pointer is swung from the zero scale position to the maximum scale position and returned back to the zero scale position, wherein the drive controller controls the stepping motor, during the sweeping operation, to accelerate to a predetermined speed by outputting a rated torque signal to the stepping motor and controls the stepping motor to rotate at the predetermined speed by outputting a decreased torque signal to the stepping motor, the decreased torque signal being lower than the rated torque signal.
摘要翻译： 仪器的驱动控制器控制步进电机旋转安装在步进电动机的旋转轴上的仪器的指针，指针可在零刻度位置和最大刻度位置之间旋转。 驱动控制器控制步进电机执行清扫操作，其中指针从零刻度位置摆动到最大刻度位置并返回到零刻度位置，其中驱动控制器在扫描操作期间控制步进马达 通过向步进电机输出额定转矩信号来加速到预定速度，并通过向步进电机输出减小的转矩信号来控制步进电机以预定速度旋转，减小的转矩信号低于额定转矩信号 。
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10.发明授权公开(公告)号：US09181057B2
公开(公告)日：2015-11-10
申请号：US14528512
申请日：2014-10-30
发明人： Tamaki Mashiba
摘要： A stepping motor control device includes a driving IC driving a stepping motor by PWM control, and a setting circuit for setting PWM frequency of the driving IC. The setting circuit sets the driving IC such that in stepping motor accelerating and decelerating periods, the PWM frequency of the driving IC becomes higher than the PWM frequency of the driving IC in a constant-speed period of the stepping motor. Thus, power loss of the driving IC in the stepping motor accelerating and decelerating periods can be reduced, and ripple current can be reduced.
摘要翻译： 步进电动机控制装置包括通过PWM控制驱动步进电动机的驱动IC和用于设定驱动IC的PWM频率的设定电路。 设定电路将驱动IC设定为在步进电机的加减速期间，在步进电机的恒定时间段内，驱动IC的PWM频率变得高于驱动用IC的PWM频率。 因此，可以减少步进电机的驱动IC的功率损耗加速和减速时间，并且可以减小纹波电流。
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