A control method of starting a locomotive cooling fan motor

• Main Authors: Lu, Lu, Song, Yang, Xu, Chaolin, Cai, Zhiwei, Yang, Xiliang
• Format: Patent
• Language: English
• Published: 13.04.2017
• Subjects: CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; DYNAMO-ELECTRIC MACHINES; ELECTRICITY; GENERATION

Abstract The invention discloses a control method of starting the locomotive cooling fan motor, which is characterized in that, the output frequency target value of inverter is set to the lower value Fl, the inverter output frequency is controlled based on the lower loading rate Rpl; when the inverter output frequency reaches F1, it can be maintained till Ti. From the time of motor starting to Ti, The smaller value output from output current limit and intermediate DC voltage limit (double closed-loop control) is multiplied by the degree of modulation to obtain the new degree of modulation ML. Then ML is applied to control the output voltage of the inverter, to make the output voltage limit fall within the given Max. starting current range and the intermediate DC voltage limit within the DC voltage limit range. At T1 time, if the output frequency target value of the inverter is set as the higher value F2, the inverter output frequency is controlled based on the higher loading rate Rp2, then F2 can be reached at T2. Therefore, the invention can achieve steady starting of fan motor at any initial speed and in any rotation direction, and can prevent over-voltage of the intermediate voltage of the inverter.