{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,4]],"date-time":"2026-05-04T16:05:21Z","timestamp":1777910721793,"version":"3.51.4"},"reference-count":25,"publisher":"SAGE Publications","issue":"9","license":[{"start":{"date-parts":[[2021,12,14]],"date-time":"2021-12-14T00:00:00Z","timestamp":1639440000000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.sagepub.com\/page\/policies\/text-and-data-mining-license"}],"funder":[{"name":"Fundamental Research Funds for Tianjin Universities","award":["2019KJ214"],"award-info":[{"award-number":["2019KJ214"]}]}],"content-domain":{"domain":["journals.sagepub.com"],"crossmark-restriction":true},"short-container-title":["Transactions of the Institute of Measurement and Control"],"published-print":{"date-parts":[[2022,6]]},"abstract":"<jats:p>The traditional direct torque control system of permanent magnet synchronous motor has many problems, such as large torque ripple and variable switching frequency. In order to improve the dynamic and static performance of the control system, a new torque control idea and speed sensorless control scheme are proposed in this paper. First, by deriving the equation of torque change rate, an improved torque controller is designed to replace the torque hysteresis controller of the traditional direct torque control. The improved direct torque control strategy can significantly reduce the torque ripple and keep the switching frequency constant. Then, based on the improved direct torque control and considering the sensitivity of the stator resistance to temperature change, a speed estimator based on the model reference adaptive method is designed. This method realizes the stator resistance on-line identification and further improves the control precision of the system. The performance of the traditional direct torque control and the improved direct torque control are compared by simulation and experiment under different operating conditions. The simulation and experimental results are presented to support the validity and effectiveness of the proposed method.<\/jats:p>","DOI":"10.1177\/01423312211062971","type":"journal-article","created":{"date-parts":[[2021,12,14]],"date-time":"2021-12-14T06:07:49Z","timestamp":1639462069000},"page":"1744-1754","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":5,"title":["Study on speed sensorless system of permanent magnet synchronous motor based on improved direct torque control"],"prefix":"10.1177","volume":"44","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8214-8647","authenticated-orcid":false,"given":"Xiaoxin","family":"Hou","sequence":"first","affiliation":[{"name":"College of Electronic Information and Automation, Tianjin University of Science & Technology, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0197-8839","authenticated-orcid":false,"given":"Mingqian","family":"Wang","sequence":"additional","affiliation":[{"name":"College of Electronic Information and Automation, Tianjin University of Science & Technology, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2511-3373","authenticated-orcid":false,"given":"Guodong","family":"You","sequence":"additional","affiliation":[{"name":"College of Electronic Information and Automation, Tianjin University of Science & Technology, China"}]},{"given":"Jinming","family":"Pan","sequence":"additional","affiliation":[{"name":"College of Biosystems Engineering and Food Science, Zhejiang University, China"}]},{"given":"Xiating","family":"Xu","sequence":"additional","affiliation":[{"name":"State Grid Taiyuan Power Supply Company, China"},{"name":"State Grid Changzhi Power Supply Company, China"}]},{"given":"Yiduo","family":"Zhang","sequence":"additional","affiliation":[{"name":"State Grid Taiyuan Power Supply Company, China"},{"name":"State Grid Changzhi Power Supply Company, China"}]},{"given":"Hui","family":"An","sequence":"additional","affiliation":[{"name":"State Grid Taiyuan Power Supply Company, China"},{"name":"State Grid Changzhi Power Supply Company, China"}]},{"given":"Zhiqiang","family":"Zhang","sequence":"additional","affiliation":[{"name":"Zhongke Heguang (Tianjin) Applied Laser Technology Research Institute Co. 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