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Research on Flux-weakening Level of Permanent Magnet AC Servo Motor

Author: ZhangZhaoYu
Tutor: TangRenYuan；ChenLiXiang
School: Shenyang University of Technology
Course: Motor and electrical
Keywords: Permanent magnet AC servo motor Weak FLUX Direct axis inductance Rotor structure
CLC: TM383.4
Type: Master's thesis
Year: 2010
Downloads: 254
Quote: 3
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Abstract


Permanent magnet AC servo motor flux weakening speed capacity difference is obstruct permanent magnet AC servo motor flux weakening speed capacity of the permanent magnet AC servo motor and propose solutions to the root cause of the high-speed development , the main content of the following parts: first, the analysis of the flux weakening speed difference between the performance of the permanent magnet AC servo motor , and to find one of the fundamental reasons , the presence of a permanent magnet , the magnetic path of the straight shaft of the direct axis inductance is too small . Flux weakening speed performance of the different placement of the permanent magnet ( different the rotor magnetic structure ) After that , the focus of analysis , based on a series of new and improved rotor magnetic circuit structure , and analyze their weak magnetic expansion speed performance from the analysis has been a way to increase the permanent magnet AC servo motor flux weakening speed performance , and better air - gap flux density waveform control of rotor magnetic circuit structure conducive . This rotor magnetic circuit structure permanent magnet ac servo motor axis inductance than traditional structures more than 30% , a 24% increase in the unit value of the direct-axis current with a maximum speed flux weakening speed that can be achieved for the 1.1 . Then , the analysis of the AC-DC axis synchronous inductance , no - load permanent magnet flux maximum electromagnetic torque of the motor , the basic speed , power factor . Reduce the direct axis inductance can increase the maximum electromagnetic torque , basic speed , power factor ; increased cross - axis inductance can increase the maximum electromagnetic torque , reducing the basic speed has little effect on the power factor . No-load permanent magnet flux and the electromagnetic torque increases linearly relationship with the basic speed decreases linearly with the power factor of the V-shaped curve relationship , these analyzes need flux weakening speed permanent magnet AC servo run motor design basis . Finally, the development and design of the structure of the two rotor permanent magnet AC servo motors , one for the built-in the radial structures ; another built- segmented structure is proposed in this paper , and the prototype of the two structures complete motor test, built- segmented structure of the motor temperature rise of 96K, an efficiency of 88.56% direct axis inductance 5.7mH 1.76 times the radial structure is built-in , verify that the built - in segment structure proposed in this paper to meet basic performance requirements under the premise of effectively improving the permanent magnet AC servo motor flux weakening speed capacity .

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CLC: > Industrial Technology > Electrotechnical > Motor > Micro-motor > Control of micro motor > Servo motor
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