scholarly journals Increase Performance of IPMSM by Combination of Maximum Torque per Ampere and Flux-Weakening Methods

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Saman Toosi ◽  
Mohammad Rezazadeh Mehrjou ◽  
Mahdi Karami ◽  
Mohammad Reza Zare
Keyword(s):  
Air Conditioner ◽  
Permanent Magnet Motor ◽  
Maximum Torque ◽  
Constant Torque ◽  
Operation Speed ◽  
Speed Range ◽  
Interior Permanent Magnet ◽  
Maximum Torque Per Ampere ◽  
Interior Permanent Magnet Motor ◽  
Flux Weakening

Interior permanent magnet motor (IPMSM) was used as air conditioner compressor to reduce the power consumption and improve the performance of the system. Two control methods including maximum torque per ampere (MTPA) and flux-weakening methods were employed to increase the speed range of the air conditioner compressor. The present study adapted the flux weakening algorithm technique which can be used for constant torque and constant power regions. Results indicated that the operation speed range of the IPMSM may increase significantly by using the proposed flux weakening algorithm.

Mode Selecting Control of Interior Permanent Magnet Synchronous Motor for Full Speed Range Operation

2010 ◽  
Vol 43 ◽  
pp. 21-27 ◽  
Author(s):  
Zhi Hong Wu ◽  
Si Bei Wu ◽  
Yuan Zhu ◽  
Guang Yu Tian
Keyword(s):  
State Transition ◽  
Permanent Magnet Synchronous Motor ◽  
Operating Conditions ◽  
Constant Torque ◽  
Speed Range ◽  
Interior Permanent Magnet ◽  
Full Speed ◽  
Source Voltage ◽  
Transition Scheme ◽  
Flux Weakening

The paper presents a new method for mode selecting which includes constant torque mode and flux-weakening mode. The proposed method modifies the working modes not by LUT (look-up table), but by the size of T0. Attractive features of this state transition technique include no dependency on the machine parameters, the least calculated quantities, making full use of the source voltage of the battery, and smooth and fast transition into and out of the flux-weakening mode. Simulation results at various operating conditions are presented to verify the feasibility of the proposed mode transition scheme.

Torque imporvement of IPM motors with skewing magnetic designs

2021 ◽  
pp. 3-10
Author(s):  
Dinh Hai Linh
Keyword(s):  
Permanent Magnet ◽  
High Speed ◽  
Torque Ripple ◽  
Maintenance Cost ◽  
Permanent Magnet Motor ◽  
Element Analysis ◽  
Speed Range ◽  
Interior Permanent Magnet ◽  
Interior Permanent Magnet Motor ◽  
Wide Speed Range

In this paper, a type interior permanent magnet synchronous motor designs is proposed for sport scooter application to improve constant torque wide speed performance. Interior Permanent Magnet machines are widely used in automotive applications for their wide-speed range operation and low maintenance cost. An existing permanent magnet motor (commercial QS Motor) is 3 kW-3000 rpm. In order to improve torque and power in wide speed range, a IPM electric motor 5.5 kW -5000 rpm can run up to 100 km/h: An Step-Skewing Interior Permanent Magnet motor alternatives is designed and optimized in detail with optimal magnetic segment V shape. The electromagnetic charateristics of Interior Permanent Magnet motors with V shape are compared with the reference Surface Permanent Magnet motor for the same geometry parameter requirements. Detailed loss and efficiency result is also analyzed at rate and maximum speeds. A prototype motor is manufactured, and initial experimental tests are performed. Detailed comparison between Finite Element Analysis and test data are also presented. It is shown that it is possible to have an optimized Interior Permanent Magnet motor for such high-speed traction application. This paper will figure out optimal angle of magnetic V shape for maximum torque and minimum torque ripple.

scholarly journals Flux Weakening Control Technique without Look-Up Tables for SynRMs Based on Flux Saturation Models

Electronics ◽  
2020 ◽  
Vol 9 (2) ◽  
pp. 218 ◽  
Author(s):  
Tae-Gyeom Woo ◽  
Sang-Hoon Lee ◽  
Hak-Jun Lee ◽  
Young-Doo Yoon
Keyword(s):  
Computation Time ◽  
Control Technique ◽  
Direction Vector ◽  
Saturation Model ◽  
Maximum Torque ◽  
Constant Torque ◽  
Maximum Torque Per Ampere ◽  
Operating Points ◽  
Flux Weakening

This paper presents a flux weakening algorithm for synchronous reluctance motors (SynRMs) based on parameters estimated at standstill. Recently, flux saturated motors have been studied. Flux saturation models were identified and look-up tables were generated based on the saturation model for maximum torque per ampere (MTPA) and flux weakening operations. The operation with tables would degrade the accuracy of operating points when the table size is not enough. The proposed method implements a flux weakening operation without tables, and the operating points are determined with voltages and currents on operating points. Therefore, the accuracy can be maintained. In addition, the computation time to generate the tables is not needed, so the initial commissioning process can be reduced. The proposed method consists of two parts: the determination of a flux weakening region and the modification of current references. The flux weakening region is determined by the angle between direction vectors along the constant torque and voltage decreasing directions in the d-q axis current plane. After identifying the flux weakening region, the current references are modified for flux weakening according to the direction vector and appropriate magnitude. The direction and magnitude are determined by the operating point of the currents and magnitude of the output voltage, respectively. Using the flux saturation model for SynRMs, the flux weakening direction can be determined accurately. As a result, flux weakening can be performed precisely. The experimental results prove the validity of the proposed method.

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