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。