Abstract:
This paper presents the design and thermal analysis
of surface-mounted brushless motor (SMBLDC) for submersible
pump applications. SMBLDC motor is used due to its high
efficiency and low torque to weight ratio in comparison to
conventional motors. For a submersible pump application, bore
well size and motor diameter are the main constraints. Following
the MNRE, GOI guidelines concerned with submersible pumps,
all the machine parameters are numerically evaluated, and then
its 2D FEA analysis is carried out in the ANSYS/Maxwell
environment. The designed motor has obtained good flux concentration and low cogging torque. Then the thermal analysis is
performed to examine the temperature rise in different parts of
the motor. Thermal network modeling of the motor is proposed to
carry out the steady-state and transient thermal analysis, which is
performed in Motor-CAD software. Thermal runaway conditions
are observed in the steady-state analysis with a severe increase in
the temperature of windings and magnets. As submersible pumps
are subjected to steady-state operations, a cooling arrangement is
also proposed to keep the temperature rise within the acceptable
range avoiding insulation failure or magnet losing its properties.
