Control method for detecting maximum torque current ratio of electromagnetic torque by using stator flux of permanent magnetic synchronous motor

Abstract

The invention discloses a control method for detecting the maximum torque current ratio of an electromagnetic torque by using a stator flux of a permanent magnetic synchronous motor. The method is characterized in that: the electromagnetic torque is detected by using the stator flux of the permanent magnetic synchronous motor in synchronous shafting, and is computed without parameters with large changes along with the running state of the motor such as inductance Ld, Lq, permanent magnet flux psi f and the like, so that the computing accuracy of the electromagnetic torque is ensured in different running states. An increment of a computed value of the electromagnetic torque is introduced as feedback, an automatic optimization algorithm of a torque angle is established, given values of currents of axles d and q of a stator are obtained by closed-loop control over the torque angle, and accurate control over the maximum torque current ratio is realized under the action of closed-loop control over the currents of the axles d and q of the stator. Due the adoption of the method, the robustness of a control system is improved, and high stable control accuracy and dynamic tracking capability are achieved; and the method is particularly suitable for the field of control over a magnetic permanent magnetic motor which has a wide running range and desires to bring the potential of the torque into full play.

Description

technical field [0001] The invention relates to a method for controlling the maximum torque-current ratio of a permanent magnet synchronous motor, in particular to a method for controlling the maximum torque-current ratio of a permanent magnet synchronous motor stator flux linkage detection electromagnetic torque. Background technique [0002] The permanent magnet synchronous motor has the advantages of high efficiency, high power density, low noise, high torque-to-current ratio, and strong robustness, and has been widely used in the field of drive control that requires a wide speed range and excellent torque characteristics. application. In order to make full use of the inverter capacity and maximize the torque potential of the permanent magnet synchronous motor, the existing technology is based on the mathematical model of the rotor field-oriented permanent magnet synchronous motor synchronous shafting, according to the electromagnetic torque and the motor parameters, sta...

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Problems solved by technology

Although this method can maintain the motor running at the operating point of the maximum torque-to-current ratio within a wide operating range, the drawing of the three-dimensional graph of the motor parameters requires professionals to obtain it through finite element analysis, and the calculation process is relatively complicated. The magnetic synchronous motor must redraw the three-dimensional map of the motor parameters, which requires a large workload and occupies a large amount of storage area. In addition, this method requires a large amount of modification of the stored data according to different motors, so there is a large gap in the actual application of the project. limitation

[0008] Although the above schemes can meet the requirements of the maximum torque-current ratio control of permanent magnet synchronous motors within a certain range, the control models used in these schemes are limited to the stator inductance parameter L d , L q and the permanent magnet flux linkage parameter ψ f To obtain the relationship between the electromagnetic torque and the d and q axis currents of the stator, a new control method for the maximum torque-current ratio of the permanent magnet synchronous motor is urgently needed in engineering practice to solve the problem of the maximum torque current of the existing permanent magnet synchronous motor The dependence of the ratio control method on the stator inductance and permanent magnet flux parameters makes the maximum torque current ratio control still have high accuracy under the condition of motor parameter changes, and realizes the full use of the capacity of the inverter and the maximum use of permanent magnets. Purpose of Magnetic Synchronous Motor Torque Potential

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