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    IMPROVEMENTS IN COMMUTATOR ASSEMBLIES
    4.
    发明专利
    IMPROVEMENTS IN COMMUTATOR ASSEMBLIES 未知

    公开(公告)号：ZA717115B

    公开(公告)日：1973-01-31

    申请号：ZA717115

    申请日：1971-10-25

    Applicant: ETTER M LTD

    Inventor： ETTER M

    IPC: H01R39/04 ,  H01R ,  H02K

    Abstract: The invention concerns a commutator assembly comprising a commutator support in which a plurality of commutator segments having an outer working surface are mounted. A preformed insulating shield is positioned at least partly over the commutator support and is keyed into the commutator segments below the outer working surface thereof. The preformed insulating shield is of hollow cylindrical shape open at one end, and closed at the other end by a plate having an axial hole therein.

    5.
    发明专利
    未知

    公开(公告)号：NO122536B

    公开(公告)日：1971-07-12

    申请号：NO14972263

    申请日：1963-08-13

    Applicant: ETTER M

    Inventor： ETTER M

    IPC: H02M1/06 ,  H02M7/51 ,  H02M7/515 ,  H02M7/525 ,  H02M7/527 ,  H02P9/42 ,  H02P23/28 ,  H02P27/04 ,  H02P27/06 ,  H02P27/08

    Abstract: 1,056,874. Inverting; control of A.C. motors. M. ETTER. Aug. 12, 1963 [Aug. 13, 1962], No. 31719/63. Headings H2F and H2J. In a polyphase inverter comprising a bridge of controlled rectifiers 5, 6 fed from a D.C. supply a, b, and feeding a motor M, control means are provided so that the current waveform attains a desired shape, preferably a sinusoid. With a rectifier 5 conducting a median point 8 is at the positive supply potential, and with a rectifier 6 conducting it is at earth; also diodes 3 and 4 carry provide for the continuance of current when a rectifier shuts off. It is therefore possible to have any desired mean potential for the point 8. Inductors and diodes 44-47 are provided to take up current surges on switching. The switching off of a rectifier is effected by firing two series rectifiers 5, 6, together so as to charge a resonant circuit 50, 51 or 52. The discharge of this circuit through the rectifiers shuts these off. Firing signals are derived from an oscillator 33 (at, say, 3000 c/s.) through a ring-counter 54 giving pulse signals Bi, Bj, Bk, at a signal frequency of 1000 c/s. These signals (Fig. 2d) pass to control units 55, 56, 47, which route each signal to either rectifier 5 (Fig. 2e) or rectifier 6 (Fig. 2f) in order to control the current so that this tends to follow a desired sinusoidal waveform. This routing is effected as follows:- The actual phase current I r (Fig. 2a) is compared with the current a of a sinusoidal source 61 of 1000 c/s. in saturable cores 58, 59, 60. Whenever these current waveforms cross a short pulse is produced (due to reversal of the magnetization) whose sign depends on whether I r is becoming larger ( + ve) or smaller ( - ve) than a (Fig 2b). These short pulses are applied to the units 55, 56, 57, wherein further pulses are produced which are started by a positive short pulse and terminated by the next negative short pulse (Fig. 2c). If the pulses Bi from the ring counter arrive during the presence of a long pulse it is routed to rectifier 6; if, however it arrives during an interval between pulses it goes to rectifier 5. The routing circuitry comprises a transistor arrangement (Fig. 3, not shown).

    6.
    发明专利
    未知

    公开(公告)号：NO121052B

    公开(公告)日：1971-01-11

    申请号：NO16144566

    申请日：1966-01-27

    Applicant: ETTER M

    Inventor： ETTER M

    IPC: H02M7/515

    Control circuit for an inverter with a variable output voltage and frequency
    10.
    发明授权
    Control circuit for an inverter with a variable output voltage and frequency 失效
    具有可变输出电压和频率的逆变器的控制电路

    公开(公告)号：US3848176A

    公开(公告)日：1974-11-12

    申请号：US34452873

    申请日：1973-03-26

    Applicant: ETTER M

    Inventor： ETTER M

    IPC: H02M7/525 ,  H02P27/04 ,  H02P27/06 ,  H02M7/52

    CPC classification number: H02P27/06 ,  H02M7/525 ,  H02P27/04 ,  H02P27/047 ,  H02P2201/03

    Abstract: An inverter with a variable output voltage and frequency, intended to supply an a.c. motor or a similar load, in which the variation of amplitude of the output voltage is provided by a chopper supplying the inverter with pulses of variable width or by switching of the inverter itself, is controlled by an electronic circuit in which the voltage supplied by the chopper or the rectified output voltage of the inverter is integrated to give an image of the instantaneous variation of the flux induced in the motor. The output voltage of the inverter is cancelled or reduced each time that the integrated signal reaches a maximum value corresponding to a desired variation of said flux, and the integrated signal is then set to zero. The chopper or the inverter is periodically reset to the minimal switching frequency of the inverter to obtain the desired output frequency or to a whole number multiple of said minimal frequency, means being provided for automatically modifying said multiple when the frequency of the chopper or of the inverter is too small or too large and for making the maximum value of the integrated signal correspond to a variation of flux equal to that obtained at said minimal frequency divided by the said chosen multiple.

    Abstract translation: 具有可变输出电压和频率的变频器，用于提供一个等 电动机或类似的负载，其中输出电压的振幅的变化由为逆变器提供可变宽度的脉冲或通过变换器本身的切换提供的斩波器提供，由电子电路控制，其中由 斩波器或整流的逆变器的输出电压被积分，以给出电动机感应通量的瞬时变化的图像。 每当积分信号达到对应于所述通量的期望变化的最大值时，逆变器的输出电压被消除或减小，然后将积分信号设置为零。 斩波器或逆变器周期性地复位到逆变器的最小开关频率以获得期望的输出频率或所述最小频率的整数倍，提供用于当斩波器的频率或 逆变器太小或太大，并且用于使积分信号的最大值对应于与所述最小频率除以所选择的倍数获得的通量的变化量相等。

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