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    • 25. 发明授权
    • Motor drive circuit
    • 电机驱动电路
    • US07786688B2
    • 2010-08-31
    • US12095989
    • 2006-12-04
    • Hiroaki HayashiToshikazu Satake
    • Hiroaki HayashiToshikazu Satake
    • H02P6/00
    • H02P7/28H02P7/29
    • A drive signal generation circuit generates drive signals that control ON and OFF states of transistors of a H-bridge circuit, in accordance with a target value of torque. A driver circuit alternatively turns ON and OFF high side transistors, and low side transistors of the H-bridge circuit, based on the drive signals outputted from the drive signal generation circuit. The driver circuit immediately turns OFF the high side transistors, when an instruction is issued to stop a motor, and after a predetermined delay time τd has elapsed, turns OFF the low side transistors.
    • 驱动信号生成电路根据转矩的目标值生成控制H桥电路的晶体管的导通和截止状态的驱动信号。 基于从驱动信号发生电路输出的驱动信号,驱动电路交替地接通和断开高侧晶体管和H桥电路的低侧晶体管。 当发出停止电动机的指令时,驱动电路立即关闭高侧晶体管,在经过预定的延迟时间τd之后,关闭低侧晶体管。
    • 27. 发明授权
    • Heat-treated steel wire for high strength spring
    • 用于高强度弹簧的热处理钢丝
    • US07575646B2
    • 2009-08-18
    • US10467493
    • 2002-02-07
    • Masayuki HashimuraTakanari MiyakiHiroshi HagiwaraHiroaki HayashiShouich SuzukiKatsuaki ShiikiNoriyuki YamadaSeiichi Koike
    • Masayuki HashimuraTakanari MiyakiHiroshi HagiwaraHiroaki HayashiShouich SuzukiKatsuaki ShiikiNoriyuki YamadaSeiichi Koike
    • C22C38/22
    • C22C38/24C21D6/008C21D9/02C22C38/04C22C38/22C22C38/34
    • The present invention provides a steel wire, for springs excellent in coiling property while having a high strength, as a heat treated steel wire for high strength springs, characterized by: comprising, in mass, C: 0.75 to 0.85%, Si: 1.5 to 2.5%, Mn: 0.5 to 1.0%, Cr: 0.3 to 1.0%, P: not more than 0.015%, S: not more than 0.015%, N: 0.001 to 0.007%, W: 0.05 to 0.3%, and the balance consisting of Fe and unavoidable impurities; having a tensile strength of not less than 2,000 MPa; spheroidal carbides, composed of mainly cementite, observed in a microscopic visual field satisfying the area percentage of the spheroidal carbides not less than 0.2 μm in circle equivalent diameter being not more than 7%, the density of the spheroidal carbides 0.2 to 3 μm in circle equivalent diameter being not more than 1 piece/μm2, and the density of the spheroidal carbides over 3 μm in circle equivalent diameter being not more than 0.001 piece/μm2; the prior austenite grain size number being #10 or larger; the content of the retained austenite being not more than 12 mass %; the maximum diameter of carbides being not more than 15 μm; and the maximum diameter of oxides being not more than 15 μm.
    • 本发明提供一种用于高强度弹簧的热处理钢丝,具有高强度卷取性能优异的弹簧钢丝,其特征在于:以质量计含有C:0.75〜0.85%,Si:1.5〜 2.5%,Mn:0.5〜1.0%,Cr:0.3〜1.0%,P:不大于0.015%,S:不大于0.015%,N:0.001〜0.007%,W:0.05〜0.3% 由Fe和不可避免的杂质组成; 拉伸强度不小于2000MPa; 球形碳化物主要由渗碳体组成,在满足圆形当量直径不小于0.2μm的球状碳化物的面积百分比的微观视野内观察不超过7%,球形碳化物的密度为0.2-3μm圆 当量直径不大于1件/ mum2,圆形当量直径3毫米以上的球状碳化物的密度不大于0.001件/ mum2; 原奥氏体晶粒数为#10以上; 残留奥氏体的含量不超过12质量%; 碳化物的最大直径不大于15μm; 氧化物的最大直径不大于15μm。
    • 28. 发明申请
    • MOTOR DRIVE CIRCUIT AND COOLING SYSTEM USING SAME
    • 电机驱动电路和使用相同的冷却系统
    • US20090066280A1
    • 2009-03-12
    • US12161912
    • 2007-01-22
    • Hiroaki Hayashi
    • Hiroaki Hayashi
    • H02P1/04
    • H02P1/22H02P7/04H02P7/29
    • A motor driving circuit generates pulse driving signals, and controls the ON/OFF state of a switching circuit connected to a coil of a motor which is to be driven, thereby controlling the conduction period of the motor. A driving signal generating circuit generates the driving signals such that they are pulse modulated according to the torque target value for the motor, and outputs the driving signals to the switching circuit. A current detection circuit detects the current flowing through the coil of the motor. A current limiting circuit controls the logical values of the driving signals generated by the driving signal generating circuit such that the current detected by the current detection circuit does not exceed a predetermined current upper limit. The current limiting circuit increases the current upper limit according to the time elapsed in the starting operation of the motor. After the starting operation of the motor, the current upper limit is set to a predetermined fixed value.
    • 马达驱动电路产生脉冲驱动信号,并且控制与要驱动的马达的线圈连接的切换电路的ON / OFF状态,从而控制马达的导通周期。 驱动信号发生电路产生驱动信号,使得它们根据电机的转矩目标值进行脉冲调制,并将驱动信号输出到开关电路。 电流检测电路检测流过马达线圈的电流。 电流限制电路控制由驱动信号发生电路产生的驱动信号的逻辑值,使得由电流检测电路检测的电流不超过预定的电流上限。 电流限制电路根据电动机启动时间经过的时间增加电流上限。 在电动机的起动操作之后,将电流上限设定为预定的固定值。