Excitation control method, system, controller and external unit of air conditioner

Abstract

The embodiment of the invention provides an excitation control method, an excitation control system, a controller and an air conditioner external unit. When a direct-current excitation power supply provides current to an exciter stator, the direct current is applied to the exciter stator to generate a constant magnetic field; when the exciter stator and an exciter rotor relatively move, the exciter rotor cuts a magnetic line of force, and generates an induced electromotive force, at the moment, a first switch is turned on, a second switch is turned off, and therefore, an alternating current output by the exciter rotor is changed into direct current after passing through a rectifying module so that the direct current required for generating the constant magnetic field by a motor rotor of the air conditioner external unit can be provided, and further, an alternating-current induced electromotive force can be generated in a motor stator, at the moment, the first switch is turned off, and the second switch is turned on, so that switching from separate excitation power generation manner to an automatic excitation power generation manner of the motor is realized, and automatic excitation of the motor in the air conditioner external unit is realized.

Description

technical field [0001] The present invention relates to the technical field of control, and more specifically, relates to an excitation control method, system, controller and an air conditioner external unit. Background technique [0002] With the popularization of frequency conversion air conditioners, energy-saving and environment-friendly air-conditioning products have attracted more and more people's attention. In today's era of high-rise urban living environment, there are abundant wind resources between buildings. If the fan of the air conditioner's external unit (that is, the motor inside the air conditioner's external unit) can be used to convert these wind resources into electrical energy, the energy saving effect of the air conditioner will be further improved. [0003] However, the inventors have found that most of the current air-conditioning external fans are squirrel-cage induction asynchronous motors, and their rotors are made of cast aluminum squirrel-cage ba...

AI Technical Summary

Problems solved by technology

[0003] However, the inventors have found that most of the current air-conditioning external fans are squirrel-cage induction asynchronous motors, and their rotors are made of cast aluminum squirrel-cage bars. If this type of motor is to be powered in a power-generating state, the motor speed must be greater than the synchronous speed. However, most air conditioner fan motors are connected by DC drive, and the speed cannot be greater than the synchronous speed in the case of wind dragging.

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