Direct current motor system and control method for direct current motor system

Abstract

The invention discloses a control method for a direct current motor system. A direct current motor system comprises N direct current motors in parallel, an IPM module connected with the N direct current motors and a main control module outputting six paths of PWM signals to the IPM module to control the N direct current motors. The control method comprises the following steps: resistances of the N direct motors are obtained, inductance parameters of the N direct motors are obtained, and the inductance parameters comprise direct axis inductance and quadrature axis inductance; back electromotive forces of the N direct motors are obtained; rotating speeds and positions of the rotors of the N direct current motors are estimated according to the resistances, the inductance parameters and the back electromotive forces of the N direct current motors and detected phase currents of the N direct current motors and the N direct current motors are controlled at the same time. The control method can raise the system control precision, parallel direct current motors with different numbers can share the same electric control structure, standardization and generalization are achieved, the system cost can be saved effectively. The invention discloses a direct current motor system.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to a control method of a DC motor system and a DC motor system. Background technique [0002] Compared with AC motors, DC motors are more energy-saving and efficient. With the national advocacy of energy conservation and emission reduction, more and more air-conditioning manufacturers use DC motors to develop and design air conditioners. Most of the existing DC motor systems use a main control module to control an IPM module (Intelligent Power Module, intelligent power module), and then drive a DC motor through the IPM module. However, the disadvantage of the prior art is that the cost of the DC motor is slightly higher than that of the AC motor. Correspondingly, the DC motor system is much more complicated and expensive than the AC motor system. In particular, most of the IPM modules rely on imports, and few domestic manufacturers produce them, resulting in high cost of IPM modules...

AI Technical Summary

Problems solved by technology

Moreover, since the main control module in the related art has at most 3 control interfaces of the IPM module, if more DC motors need to be controlled, the main control module needs to be added

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