公开(公告)号：US4749923A

公开(公告)日：1988-06-07

申请号：US38183

申请日：1987-04-14

Applicant: Yu S. Chieng

Inventor： Yu S. Chieng

IPC: D05B69/22 ,  H02P3/10

CPC classification number: D05B69/22

Abstract: A motor control device provided on an electric sewing machine comprising a brushless permanent-magnet motor and in combination with a magnetic pole sensor, rotational-speed and rotational-speed polarity detector for sewing machine, detectors for needle-position and needle positioning signal, and the control systems of speed and needle stagnation thereof; with the specific ways of controlling the needle stagnant position and the strength of the reverse current for braking the motor, simple structure, less power wastage and no wearable friction clutch and brake device are needed, a quick sewing machine starting, quick stabilizing of speed control and precise stagnation of the sewing needle at a preset position can be achieved.

Abstract translation: 一种设置在电动缝纫机上的电动机控制装置，包括无刷永磁电动机，与磁极传感器，缝纫机的转速和转速极性检测器，针位置和针定位信号的检测器，以及 速度和针停滞的控制系统; 具体的方法是控制针停滞位置和反向电流强度，制动电机，结构简单，耗电少，无需摩擦离合器和制动装置，快速缝纫机启动，速度控制快速稳定 可以实现缝纫针在预定位置的精确停滞。