A constant torque control method of ecm motor applied to fan system

Abstract

The invention discloses a constant torque control method of an ECM motor applied to a fan system. It is necessary to first set the maximum operating speed spd_max_ref and the minimum operating speed spd_min_ref of the motor within the constant torque operating range; Control to obtain the corresponding upper limit torque T_ref_up; use spd_min_ref as the reference command to perform constant speed PI control to obtain the corresponding lower limit torque T_ref_low, T_ref_up>T_ref_low; receive external torque command value Tcom; compare the values ​​of Tcom, T_ref_up and T_ref_low, and finally determine Tact value, and then control the motor to perform constant torque control operation with Tact as the target torque value; it can run stably in the full speed range, improve the user experience and improve the reliability of the product; the corresponding speed at the critical point of the speed limit will not generate shock.

Description

technical field [0001] The present invention relates to a constant torque control method of an ECM motor applied to a fan system. Background technique [0002] At present, many fan systems use ECM motors as power sources. ECM motors are referred to as electronically commutated motors, and can also be called DC brushless permanent magnet synchronous motors. Due to the different use environments of ECM motors, the control modes of ECM motors generally include: constant speed control , constant torque control and constant air volume control, etc. Constant torque control is a more commonly used mode. Currently, the vector control method is commonly used. The vector control mathematical model is complex, the calculation is cumbersome, it requires a CPU with strong computing power, and the manufacturing cost is high. See the application The number is CN201811334775.7, and the name is a constant torque control method based on a position sensorless vector control permanent magnet sy...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a constant torque control method for ECM motors, which solves the problem of constant torque control methods for ECM motors used in fan systems in the prior art, without limiting the maximum and minimum speeds. The noise and vibration are too large, which affects the user's experience of silence. Because the vibration is large, it will cause fatigue of mechanical parts, shorten the life, and the motor speed will be too low, which will affect the technical problem of the user's requirements for air volume.

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