| 摘要 |
In order to control a rotating field machine, an angle signal for the field angle of the rotating field machine is required, calculated with a high time resolution. The computing speed of microprocessors does not allow this virtually continuous angle signal to be calculated from voltage and current values. However, because of the inertia of the system, the rotation speed of the field vector changes only slowly. The microprocessor therefore reads the measured values of the current and voltage only in a relatively slow cycle (t mu ), processes them into the components of an e.m.f. vector which is converted into a magnitude ( psi ) and a discontinuously changing value ( omega ) for the frequency of the flux vector and the e.m.f. vector. A hardware integrator (INT1), arranged outside the microprocessor, provides a quasi-continuously changing signal ( phi ) for the field angle, with a high computing cycle. <IMAGE> |
