Description
Speed Control of BLDC Motor using LUO Converter
This project is mainly used to control the speed of the BLDC motor by employing an LUO converter. The LUO converter is used to step up the input dc voltage. The LUO converter output voltage depends on the duty cycle of the converter. The BLDC motor has high reliability, high-efficiency high torque/inertia ratio, improved cooling, low radio frequency interference, and noise and requires practically no maintenance.
Introduction:
The LUO converter exhibits the advantages over the conventional buck, boost, buck-boost, and Cuk converter when employed in SPV-based applications. The LUO converter dc voltage is applied to a three-phase inverter circuit. The three-phase inverter converts the dc voltage into three-phase ac voltage. The LUO converter operates to increase the output voltage.
Proposed System:
This project is proposed to control the speed of the BLDC motor by employing an LUO converter. The AC supply is applied to the bridge rectifier, the bridge rectifier converts ac supply into dc supply. That dc supply is applied to an LUO converter, the LUO converter boosts the input voltage (i.e) if input 15v dc means LUO converter output voltage is greater than 15v dc voltage. That dc voltage is given to the three-phase inverter, it converts the dc voltage into three-phase ac voltage. The three-phase ac voltage is connected to the BLDC motor. The BLDC motor has a hall sensor. The hall sensor output is feedback to the controller. The three-phase inverter Pulse depends on the hall sensor of the BLDC motor. The DSPIC controller key functions are used to control the BLDC motor speed.Speed Control of BLDC Motor using LUO Converter
Block Diagram
Block Diagram Explanation
- Pulse generator: ? Here we have used a DSPIC microcontroller (DSPIC 30F4011) to generate a PWM signal.
- Driver circuit: -It is used to amplify the pulses and provided isolations using an optocoupler. It has two functions,
- Amplification
- Isolation
- Bridge Rectifier: It converts AC supply to DC Supply.
- Luo converter: It converts low voltage DC to high voltage DC supply.
- Three-phase inverter: It converts the DC supply to a three-phase AC Supply to drive the BLDC motor.
Driver Board and Dspic Controller Board:
Working:
The DSPIC controller is used to generate the PWM pulses for the converter and inverter circuit. The DSPIC controller pulses are given to the driver circuit as input. The Driver board is mainly used to isolate and amplify the input signals from the controller. The amplified driver output is connected to the main power circuit devices. The duty cycle is applied to the Luo converter to vary the output voltage. Three-phase inverter PWM is generated based on Hall sensor feedback.
Circuit Diagram For Luo Converter:
Circuit Diagram For Three Phase Inverter:
Advantages:
- Easy to control the speed
- Highly reliable
- High efficiency and less maintenance
- Less noise
Applications:
- Industrial applications
- Water pumping system
Conclusion:
This project is to control the speed of the BLDC motor by employing an LUO converter and three-phase inverter. This inverter has low switching losses and BLDC motor control without any additional control. And also study the response of all characteristics and theories. This project is highly reliable and obtains the high efficiency of this control technique.
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