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    • 1. 发明授权
    • Converter circuit having control means with capability to short-circuit converter output
    • 转换器电路具有控制装置,具有短路转换器输出的能力
    • US06320772B1
    • 2001-11-20
    • US09573824
    • 2000-05-18
    • Yoshiaki DoyamaKaneharu YoshiokaMitsuo UedaMasanori OgawaHideo Matsushiro
    • Yoshiaki DoyamaKaneharu YoshiokaMitsuo UedaMasanori OgawaHideo Matsushiro
    • H02M542
    • H02M1/4208Y02B70/126Y02P80/112
    • A converter circuit has a reactor connectable to an AC power supply. It further has a PWM converter circuit connected to the reactor, the PWM converter circuit including a high speed diode, a rectifier diode and a switching element connected in parallel to the rectifier diode. The converter circuit further has an input current detector for detecting an input current of the PWM converter circuit, a DC voltage level detector for detecting an output voltage of the PWM converter circuit, a voltage polarity detector connected to the AC power supply, and a control device. The control device measures a variation period of the output voltage measured by the voltage level detector to judge a power supply frequency. It then controls the PWM converter circuit based on a power supply frequency judgement result, a detection result from the voltage level detector, an input current detected by the input current detector, and an output voltage detected by the DC voltage detector.
    • A转换器电路具有可连接到AC电源的电抗器。 它还具有连接到电抗器的PWM转换器电路,PWM转换器电路包括与整流二极管并联连接的高速二极管,整流二极管和开关元件。 转换器电路还具有用于检测PWM转换电路的输入电流的输入电流检测器,用于检测PWM转换电路的输出电压的直流电压电平检测器,与交流电源连接的电压极性检测器,以及控制电路 设备。 控制装置测量由电压电平检测器测量的输出电压的变化周期,以判断电源频率。 然后,根据电源频率判断结果,电压电平检测器的检测结果,输入电流检测器检测到的输入电流以及由直流电压检测器检测的输出电压来控制PWM转换电路。
    • 2. 发明授权
    • Inverter control apparatus
    • 变频器控制装置
    • US5646499A
    • 1997-07-08
    • US516659
    • 1995-08-18
    • Yoshiaki DoyamaKeizo MatsuiYoshiteru ItoKaneharu YoshiokaHideo OgataIzumi YoshidaShusaku Watakabe
    • Yoshiaki DoyamaKeizo MatsuiYoshiteru ItoKaneharu YoshiokaHideo OgataIzumi YoshidaShusaku Watakabe
    • G01P3/48H02P23/08H02P5/408
    • G01P3/48H02P23/08
    • An inverter control apparatus for controlling a command frequency and a command voltage which are supplied to an inverter which then supplies AC power of a desired frequency, accordingly, to an induction motor. The inverter control apparatus receives a requested rotational speed of the motor and an actual rotational speed of the motor is obtained by detecting a frequency of a fluctuation component of a drive current supplied from the inverter to the induction motor. The difference between the requested rotational speed and the actual rotational speed represents a slip amount, which is added to the requested rotational speed to produce a command frequency. The command voltage is set to a voltage acquired when the monitored drive current is at a minimum value. Thus, the inverter control apparatus is able to maintain power consumption at the lowest possible level in response to changes in the operating environment without requiring a motor constant input or a motor speed detector, while compensating the slip ratio of the induction motor to maintain the motor speed at a target level.
    • 一种逆变器控制装置,用于控制提供给逆变器的指令频率和指令电压,然后将逆变器提供所需频率的交流电力给感应电动机。 逆变器控制装置接收电动机的请求转速,并且通过检测从逆变器提供给感应电动机的驱动电流的变动分量的频率来获得电动机的实际转速。 所请求的转速与实际转速之间的差值表示一个滑移量,它被加到所要求的转速上以产生一个指令频率。 指令电压被设定为当监视的驱动电流处于最小值时获取的电压。 因此,逆变器控制装置能够在不需要电动机恒定输入或电动机速度检测器的情况下响应于操作环境的变化而将功率消耗保持在最低可能水平,同时补偿感应电动机的滑动比来维持电动机 速度在目标水平。
    • 3. 发明授权
    • Brushless motor driving circuit and a method of controlling the brushless motor driving circuit
    • 无刷电机驱动电路及无刷电机驱动电路的控制方法
    • US06232730B1
    • 2001-05-15
    • US09323967
    • 1999-06-02
    • Yoshiaki DoyamaHideki NakataKaneharu YoshiokaMakoto Yoshida
    • Yoshiaki DoyamaHideki NakataKaneharu YoshiokaMakoto Yoshida
    • H02P500
    • H02P6/182H02P6/21
    • In a brushless motor driving circuit of the invention, in the starting operation, an applying voltage is low and also the induced voltage is low, so that output values from sample and hold circuits 6 and 7 are substantially equal to each other. Thus, an output from a comparing circuit 10 is substantially equal to an output of a V/f converting circuit 11. As a result, the starting method which is identical with a conventional method is used. By contrast, when the number of rotation of a brushless motor 1 is increased, and the induced voltage is started to be observed, the condition is spontaneously shifted to that in which the driving voltage is automatically controlled at each time to an appropriate value for the number of rotation and the load of the motor. Accordingly, the switching operation from the starting control to the normal control is not required.
    • 在本发明的无刷电动机驱动电路中,在起动动作中,施加电压低,感应电压低,从而采样保持电路6和7的输出值基本相等。 因此,比较电路10的输出基本上等于V / f转换电路11的输出。因此,使用与常规方法相同的启动方法。 相反,当无刷电动机1的转数增加并且感应电压开始被观察时,条件自发地转移到每次自动控制驱动电压的条件到适当的值 旋转次数和电机负载。 因此,不需要从启动控制到正常控制的切换操作。
    • 7. 发明授权
    • Apparatus for reproducing information at variable speeds from a magnetic
tape
    • 用于以磁带从可变速度再现信息的装置
    • US4791507A
    • 1988-12-13
    • US817860
    • 1985-12-30
    • Yoshiaki DoyamaKanji KuboKoichi Yamada
    • Yoshiaki DoyamaKanji KuboKoichi Yamada
    • G11B5/592G11B15/18G11B5/584H04N5/783
    • G11B15/1875G11B5/592
    • A magnetic recording-playback apparatus having a rotary magnetic head mounted on a piezo-electric element so that the head can trace a recording track. The scanning track, voltage waveform applied to a piezo-electric element and tape speed for the next head scanning operation are calculated based on the current application voltage center value and current tape speed, and this arithmetic operation is repeated for each head scan, thereby enabling continuous noise-free picture reproduction at arbitrary tape speeds. Moreover, when the tape speed is changed, the speed command is varied in steps up to the target speed, thereby enabling noise-free picture reproduction also in the transition of tape speeds.
    • PCT No.PCT / JP85 / 00259 Sec。 371日期1985年12月30日第 102(e)1985年12月30日日期PCT提交1985年5月9日PCT公布。 第WO85 / 05522号公报 1985年12月5日。一种磁记录重放装置,其具有安装在压电元件上的旋转磁头,使得头可以跟踪记录轨道。 根据当前施加电压中心值和当前磁带速度计算施加到压电元件的扫描轨迹,电压波形和用于下一个头扫描操作的磁带速度,并且对于每个头扫描重复该算术运算,从而使能 连续无噪音的图像以任意的磁带速度再现。 此外,当磁带速度改变时,速度指令一直升高到目标速度,从而在磁带速度的转变中也能够实现无噪点的图像再现。