To obtain the characteristic curves of DC shunt mo
2016-08-23
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Brief description of the experiment: 1) speed current characteristic in DC motor, excitation current is constant, so motor speed is affected by byiara drop and demagnetization armature reaction. With the increase of ophea, the magnetic armature increases the effect, which reduces the flux of the field and tends to increase, but with the increase of IA, the Yala drop increases and it decreases somewhat. Therefore, due to the increase of IA, the insurance industry provides a value w = (vt IARA) / (KA * φ) (φ = fieldflux) with only a slight decrease in speed. Therefore, the characteristic is a straight line. In the DC series motor, the main flux is directly proportional to the armature current, so φ = CIA, so w = (VT / KAC IA) ((RA + RS) / ka C) therefore, the characteristic is hyperbolic. 2) Torque current characteristics - in DC parallel motors, if the flux is constant in the dcshunt motor, the torque is proportional to the armature current and the Socha characteristic is a straight line. TE = Ka phiia in DC series motor, TE = Ka phiia as φ = CIA, so TE = kacia2, so the characteristic is a parabola. 3) Speed torque characteristic also known as mechanical characteristic of machine. In DC parallel motor, w = (vt IARA) / (KA * φ) (φ = fieldflux) but TE = Ka φ IA or ia = TE / KA φ, so w = (1 / KA φ) (VT - (Tera / KA φ)) w = W0 - (φ 2m / ka2) so, as φ is continuous, it is characterized by straight line. In DC series motor, IA = (TE / KAC) 1 / 2, so w = (VT / (TE / KAC) 1 / 2)-
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