New resonant pole inverter for battery fed brushless dc motor drive

The brushless DC motor (BLDC) has been widely used in industrial applications because of its low inertia, fast response, high power density, high reliability, and maintenance-free reputation. They are usually supplied by a hard switching PWM inverter, with rather high switching loss. Therefore large heat-sinks are required for dissipation of this switching loss which increase the volume and weight of the drive system. In order to reduce switching losses, many soft switching inverters have been designed by several researchers. Soft-switching circuits has other problems, such as excessive voltage stress, non-full PWM control and complexity in control scheme or implementation. This paper presents a simple soft switch inverter proposed which is applicable to battery-fed BLDC drive systems. This inverter has low switching-power loss, low voltage stress on the main switches, simple control scheme and easy to implement. After analytical analysis simulation results are shown to verify the theoretical analysis.