Development and modification of permanent magnet brushed DC motor for hybrid photovoltaic-operated solar systems

Figures & data

Figure 1 Magnetic coupling arrangement in BLDC.

Figure 2 Arrangement of PMDC motor run by PV module coupled with a pump.

Figure 3 Modified permanent magnets arrangement in the stator.

Figure 4 (a) Net magnetomotive force in case of a conventional PMDC motor; (b) Net magnetomotive force in case of a modified PMDC motor with reduced net emf.

Figure 5 (a) Modified shaft with the rotor assembly; (b) Rotor slots of CRGO; (c) Actual photograph of modified shaft with the rotor assembly.

Figure 6 (a) Schematic diagram of carbon brush assembly; (b) Actual photograph of carbon brush assembly.

Figure 7 Rotor cage with the ventilating front and end covers.

Figure 8 Full schematic of the modified PMDC motor with pump.

Figure 9 Actual photograph of the modified PMDC motor.

Figure 10 Schematic diagram of hybrid PVT solar water.

Figure 11 Actual photograph of experimental Set-up.

Figure 12 No-load voltage versus RPM characteristics.

Figure 13 Load voltage V_L and short circuit current I_L versus RPM characteristics of modified motor on 05 October 2012.

Figure 14 Electrical power consumed versus water circulated in l/min with reference to solar intensity on 05 October 2012.

Figure 15 Instantaneous efficiency of hybrid PVT solar water heater in forced and natural circulation modes.