Open loop speed control

The power supply voltage is ± vs;
the control voltage V. The maximum value is v..., when this voltage is input, the output should reach
100% duty cycle}
  The input impedance controlled is RrN; the calculation formula of
    a=VR/VTn is     R3= Yujian, ± salt     R-———— July 1st     . (a + ysIl + lost) from Rm a 莋iwife fish and take R = Yan, we get R, = 2Rna-R, and r. One; poisonous     y,. 1 alarm     R2- 2R, assuming that the charging current of the PWM timing circuit is ≤5mA, then there is     a case, = urn emergency     case , where fT is the PWM frequency. The maximum allowed motor current k. Decided to meet.     one. =For example,     for the open-loop control system shown in Figure 2-32, the requirements are:     ± vs = ±15V     n Xiu·±10VRiw:iOkfl PWM frequency, =30kHz     current limit』...-8A