Abstract
Many application fields need motors that could output large torque in a short span of time such as missile and aircraft, but larger torque needs larger volume that could influence the system performance. Therefore, promoting the motor's maximum torque with small volume is the new challenge for motors. So, this paper presents a method for analyzing maximum electromechanical torque (with rate speed) of PMSM without the consideration of thermal effect produced by copper loss. This paper also discusses the factors that influence maximum torque of PMSM under the condition of i d = 0 control mode. A function between motor torque and the inner parameters is first obtained under the constraint of electrical and magnetic saturation. For verifying the accuracy of the function and its results, the characteristics of the series motors with different inner parameters that are obtained in the function are testified by finite element method (FEM) software. Finally, a prototype motor is selected to be manufactured to verify the analysis result. Based on the torque experiments result, it could verify the accuracy of the function that describes the rule of PMSM maximum torque. Based on FEM software and prototype test verifying, the method could supply the theoretical support for PMSM maximum torque design.
Highlights
In the field of missile and aerospace, the motor is not required to have a long lifetime, and is only used for a short period
The traditional motor theory adopts a large volume and mass to ensure large torque, large volume brings large inertia, and high torque density and high dynamic response level cannot be reached by Permanent-Magnet Synchronous Machines (PMSM)
This paper presents a novel analysis method to analyze the rule between PMSM maximum power/torque and its inner parameters under the condition of id = 0 control mode
Summary
In the field of missile and aerospace, the motor is not required to have a long lifetime, and is only used for a short period. The fields that require motors should have high power density and high torque density for high dynamic characteristic [1], [13]. Such application fields require an electrical actuator output maximum torque under the condition of rated speed, so they could reach the highest dynamic response ability. This paper explores the function between the ultimate power and the inner parameters, which includes winding coil turn and winding current under the condition of the control model It describes the relationship between the motor output characteristic and motor parameters
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