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    1.
    发明专利
    未知

    公开(公告)号：DE2710935A1

    公开(公告)日：1978-09-14

    申请号：DE2710935

    申请日：1977-03-12

    Applicant: IBM DEUTSCHLAND

    Inventor： SAKMANN WALTER DIPL ING

    IPC: B41J2/26 ,  B41J2/295 ,  H01L41/09 ,  B41J3/10

    Abstract: A matrix printer with piezoelectrically driven printing needles is described in which an electrically controlled piezocrystal arrangement transfers upon its expansion, its change of length to a buckling spring. Coupled to the buckling compression column spring is a printing needle which, upon the deflection of the buckling spring, is driven in the printing direction.

    2.
    发明专利
    未知

    公开(公告)号：DE3280350D1

    公开(公告)日：1991-09-26

    申请号：DE3280350

    申请日：1982-08-25

    Applicant: IBM DEUTSCHLAND

    Inventor： SAKMANN WALTER DIPL ING ,  LANG ALBRECHT

    IPC: H03F3/217 ,  H03F3/20 ,  H03K5/02 ,  H03K17/00 ,  H03K17/0412 ,  H03K17/082 ,  H03K17/04 ,  H03K17/08

    Abstract: The pulse-driven transistor amplifier achieves reduced switching time without the use of auxiliary voltages. The power amplifier has the bases of two complementary transistors connected together to the collector of an input stage and via a resistor to the positive pole of the voltage supply. The emitters of the transistors are likewise connected together and via a capacitor to the base of the output stage transistor. The collector of the first transistor in the pair is coupled to the positive supply pole whilst that of the other is coupled to the reference supply pole. If the output stages are Darlington pairs, the capacitors are connected to the bases of the output transistors of the Darlington pairs whilst the input transistors of the pairs are provided with diodes to prevent saturation.

    METHOD AND ARRANGEMENT FOR THE CONTINUOUS RUNNING SPEED CONTROL OF BRUSHLESS D.C.MOTORS
    3.
    发明专利
    METHOD AND ARRANGEMENT FOR THE CONTINUOUS RUNNING SPEED CONTROL OF BRUSHLESS D.C.MOTORS 未知

    公开(公告)号：DE3273111D1

    公开(公告)日：1986-10-16

    申请号：DE3273111

    申请日：1982-04-29

    Applicant: IBM DEUTSCHLAND ,  IBM

    Inventor： SAKMANN WALTER DIPL ING ,  ZIMMERMANN VOLKER DIPL ING

    IPC: H02P6/06 ,  H02P6/14 ,  H02P6/02

    Abstract: 1. Method for the constant speed control of a brushless DC motor whose pole windings receive a pulsed control voltage between their commutation points, characterized in that the commutation points are synchronized with the motor current drop times of the control voltage pulses, the pulse-on and pulse-off times of the pulsed control voltage being derived from the motor speed characteristics, viz., from a) the deviation of the motor speed from a desired value ; b) the instantaneous acceleration of the motor ; c) the duration of a control voltage pulse period (TV1alt) of a preceding commutation period (Talt) ; d) constants characterizing the motor drive system ; that in the case of commutation occurring upon the start of the pulse-off time, the control voltage pulse period TV1, consisting of the pulse-off time TV3 and the pulse-on time (TV1-TV3), is determined on the basis of the time value Talt of the preceding commutation period, and that time TV2 is determined to have the same value for all control pulse periods occurring between two commutation points and consisting of the pulse-off time TV4 and the pulse-on time (TV2-TV4), and that the pulse-on and the pulse-off times of the pulsed control voltage are calculated according to the following control algorithm : TV1 = K1 + TV1alt + GI x DT + P x (DT-DTalt) TV2 = K2 + A2 x TV1 TV3 = K3 + A3 x TV1 TV4 = K4 + A4 x TV1 where : DT is the time difference between a time value corresponding to the desired speed and the actual speed for a current commutation period T ; DTalt is the time difference between a time value corresponding to the desired speed and the actual speed for a commutation period preceding a current commutation period ; TV1alt is the TV1 control voltage pulse period previously calculated for the commutation period preceding a current commutation period ; G1 is the gain factor ; P is the weighted past factor ; A2-A4 are attenuation factors ; K1-K4 are constants of the motor drive system ; TV1 is a control voltage pulse period consisting of a pulse-off time TV3 and a pulse-on time (TV1-TV3) for a "sawtooth" of the motor current formed as a result of a current drop and a current rise, and in which commutation is effected upon the start of a current drop ; TV3 is the current drop time in the control voltage pulse period TV1 ; TV2 is the control voltage pulse period consisting of a pulse-off time TV4 and a pulse-on time (TV2-TV4) for a "sawtooth" of the motor current without commutation formed as a result of a current drop and a current rise ; and TV4 is the current drop time in the control voltage pulse period TV2.

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