The Landsman converter based on a power factor correction (PFC) in bridgeless (BL) configuration feeding a brushless DC motor (BLDCM) drive is proposed for low power household appliances. The conduction losses associated with diodes are reduced by BL configuration and switching losses of solid-state switches of voltage source inverter are reduced by the use of low frequency switching signals in electronic commutation for the BLDCM. The front-end bridgeless PFC based Landsman converter operating in the discontinuous inductor current mode (DICM) is used for controlling the DC link voltage and PFC is attained naturally with reduced conduction losses and switch stress. A single voltage sensor is used for controlling the DC bus voltage. A prototype is developed to study performance of the system for wide range speed control and power quality improvement. The experimental performance of BLDCM is presented for its functions at varying voltages of AC mains (90V- 265 V) to adhere the limits defined by IEC61000-3-2 standard.     This project makes use of a BLDC motor drive served through a PFC built BL Landsman converter. The BLDCM speed is directly tuned with the adjustable DC bus voltage. This permits the low switching frequency of switches, by electronic commutation of BLDC motor, to diminish the losses related to switching in six IGBT’s (Insulated Gate Bipolar Transistors) of VSI. A prototype of the system is implemented to show its effectiveness for power quality, voltage and current stress of power device, controlling speed over broad range and power- factor near unity at worldwide AC supply (90V-270V).   The main controlling device of the whole system is an Arduino Microcontroller. BLDC motor, DC bus and bridgeless Landsman converter circuit are interfaced to Microcontroller. The Microcontroller initially measures the speed of the BLDC motor connected to it will be display on LCD. To perform this intelligent task, Microcontroller is loaded with an intelligent program written using embedded ‘C’ language.        

The major building blocks of this project are:  

1. Regulated power supply.
2. ARDUINO Microcontroller.
3. BLDC motor
4. ESC.
5. LCD display.
6. POT.
7. PFC built BL Landsman converter.

     

Software’s used:  

• Embedded C programming.
• Arduino IDE for dumping code into Micro controller.
• Express SCH for Circuit design.

         

Block diagram:

     

video: