PM HVAC METHOD FOR CONSTANT AIR VOLUME CONTROL BY DIRECT POWER CONTROL OF PM MOTOR AND HVAC SYSTEM APPLYING SAME

• Main Authors: ZHOU YIQIAO, ZHANG ZHENG, ZHAO YONG, WANG JIZHONG
• Format: Patent
• Language: English; Korean
• Published: 20.02.2018
• Subjects: AIR-CONDITIONING, AIR-HUMIDIFICATION, VENTILATION, USE OF AIRCURRENTS FOR SCREENING; BLASTING; CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; HEATING; LIGHTING; MECHANICAL ENGINEERING; NON-POSITIVE DISPLACEMENT PUMPS; POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS; RANGES; VENTILATING; WEAPONS

본 발명은 직접 전력-제언된 PM 모터에 의해 제어되는 일정한 공기 흐름을 위한 제어 방법에 관한 것이고, PM 모터는 팬 휠의 회전을 구동하기 위하여 HVAC 시스템에 설치되고, 그리고 PM 모터는 고정자 컴포넌트, 영구 자석 회전자 컴포넌트들, 및 모터 제어기를 가진다. 몇몇 실시예들에서, 모터 제어기는 동작 파라미터들 감지 회로 및 마이크로프로세서를 포함한다. The present invention discloses a method of constant airflow control of motor direct power control and a HVAC system using the same. The method comprises the following steps of: step A), starting a motor controller to receive a target airflow IN-CFM; step B), acquiring a corresponding function P=f(n) according to the target airflow IN-CFM; step C), entering a direct power controlled constant airflow control mode: controlling a motor to reach a steady working point (pt, nt) along a control track of the function P=f(n); step D), calculating the real-time input power Pi of the motor according to operating parameters of the motor, and calculating ”P=| Pt-Pi |; step E), keeping the current working point if ”P is less than a set value Pset; step F), calculating whether the operating time of a speed loop is reached if ”P is greater than or equal to the set value Pset, and keeping the current working point if the operating time of the speed loop is not reached; and step G), entering a speed control circuit to adjust the speed if the time is already reached, so as to realize a new working point (Pi, ni) on the track, i.e., letting pt=Pi and nt=ni, and returning to step C. The present invention is particularly suitable for the airflow control at a steady state, and has simple algorithm, low requirements for CPU operation, low cost and high control accuracy.