Range hood provided with position-sensorless brushless direct-current motor and control method thereof

Abstract

The invention provides a range hood provided with a position-sensorless brushless direct-current motor. The range hood provided with the position-sensorless brushless direct-current motor comprises a speed setting unit, a CPU microprocessor, a current sampling unit, a counter electromotive force zero-cross detecting unit and a power supply, wherein the speed setting unit, the CPU microprocessor, the current sampling unit and the counter electromotive force zero-cross detecting unit are connected, and the power supply supplies power to the speed setting unit, the CPU microprocessor and an IPM three-phase full-bridge intelligent power amplification unit. The range hood provided with the position-sensorless brushless direct-current motor further comprises the IPM three-phase full-bridge intelligent power amplification unit. The IPM three-phase full-bridge intelligent power amplification unit comprises a kernel unit, a temperature ultralimit monitoring unit and a three-phase invert unit. After conducting A/D conversion and operation on speed adjustment signals input by the speed setting unit, the CPU microprocessor outputs a PWM waveform at a corresponding duty ratio, and the waveform is amplified and isolated by the kernel unit and then drives the three-phase invert unit to amplify the power of the waveform and load the waveform to the motor. The range hood provided with the position-sensorless brushless direct-current motor has the beneficial effects of being simple and reasonable in structure, environmentally friendly and low in power consumption and saves energy.

Description

technical field [0001] The invention relates to a DC brushless motor without a position sensor and a range hood with variable frequency and stepless speed regulation and a control method thereof. Background technique [0002] At present, most range hood motors in the industry are single-phase asynchronous AC motors. This type of motor is characterized by low energy efficiency, with a general efficiency of about 40%. The motor is relatively large and needs a capacitor to start. The gears are generally 2 or 3 One, the speed adjustment range is small, and the total pressure efficiency of the whole machine assembled on the range hood is generally about 23%. The brushless position sensorless DC motor generally has an efficiency of more than 80%, and the total voltage efficiency of the whole machine assembled on the range hood is higher than 40%. The energy saving effect is very obvious, especially the wide speed range, which can realize frequency conversion. Stepless speed regul...

AI Technical Summary

Problems solved by technology

The above structure enables the range hood to intelligently select the working state of the motor of the fan system, and also ensures the use effect of the range hood, effectively improves the kitchen fume environment, and achieves energy saving and environmental protection. However, no specific implementation plan for the speed control module is proposed, which cannot meet the needs of users. operating requirements

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