Rotor steady-state current distribution of double squirrel cage motor considering skin effect

Abstract

In order to effectively research rotor steady-state current distribution of double squirrel cage motor in case of skin effect, equivalent transformation of rotor branch of independent end-ring type and common end-ring type double squirrel cage motor were carried out, layering method was used to deal with upper and lower bar branches, and method for calculating rotor steady-state current distribution of independent end-ring type and common end-ring type double squirrel cage motor in case of skin effect was presented. The analysis results show that current distribution of rotor upper and lower cage of independent end-ring type and common end-ring type double squirrel cage motor is basically the same, the higher the frequency, the more dense the current is distributed in upper cage than that in lower cage; under power frequency supply, rotor basic frequency current distribution of independent end-ring type and common end-ring type double squirrel cage motor is basically the same when the motor is running normally, and skin effect of common end-ring type double squirrel cage motor is more obvious than that of independent end-ring type double squirrel cage motor when the motor is short-circuit running; current ratio of upper and lower cage of common end-ring type double squirrel cage motor is larger than that of independent end-ring type double squirrel cage motor at the same current frequency.

Keywords

• double squirrel cage motor
• rotor current distribution
• skin effect
• independent end-ring
• common end-ring
• rotor steady-state current