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公开(公告)号：EP4156497A1
公开(公告)日：2023-03-29
申请号：EP22164753.0
申请日：2022-03-28
发明人： YANG, Chin-Shu , WU, Chih-Huang
摘要： A motor drive system includes a rectifier circuit (1), a controller (2), a modulator circuit (3) and a direct current (DC) motor (8). The rectifier circuit (1) is configured to convert an alternating current (AC) voltage to a DC voltage. The controller (2) is configured to output a control signal. The modulator circuit (3) includes a pulse generation module (4), a feedback determination module (5), a pulse modulation module (6) and a driving module (7), and is configured to generate a modulated DC driving signal based on the DC voltage and the control signal generated by the rectifier circuit (1) and the controller (2). The DC motor (8) is configured to operate in accordance with the modulated DC driving signal generated by the modulator circuit (3).
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公开(公告)号：EP4144905A1
公开(公告)日：2023-03-08
申请号：EP22150275.0
申请日：2022-01-05
发明人： HUANG, Ching-Lin , LIN, Su-Mei , CHENG, Chih-Hsiao , YU, Chia-Hui
IPC分类号： D05B27/02
摘要： A feed dog device of a sewing machine includes a driving unit (1), a needle plate unit (2), a feed dog unit (3), an up-down transmitting unit (4), a horizontal transmitting unit (5) and a direction adjusting unit (6). The direction adjusting unit (6) includes a stepper motor (63) with a variable rotational speed controlled in accordance with a speed of the driving shaft (12) of the driving unit (1), and a linkage mechanism (64) actuatable by the stepper motor (63) to be moved to different positions so as to interfere with a horizontal reciprocating motion by the horizontal transmitting unit (5) such that the horizontal reciprocating motion cooperates with the up-down reciprocating motion by the up-down transmitting unit (4) to bring the feed dog unit (3) into performing a variable moving course.
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