公开(公告)号：US4631457A

公开(公告)日：1986-12-23

申请号：US666047

申请日：1984-10-29

申请人： Jiro Tanuma ,  Takao Uchida ,  Kunihal Hayashi

发明人： Jiro Tanuma ,  Takao Uchida ,  Kunihal Hayashi

IPC分类号： H02K11/00 ,  H02P6/20 ,  H02P6/02 ,  H02K29/12

CPC分类号： H02P6/20 ,  Y10S400/903

摘要： The present invention relates to a method of leading a moving body, such as a print head carrier of a printer of the like, which is driven by a direct current brushless motor, to a starting position. The direct current brushless motor, which forms part of the present invention, includes a stator including a plurality of armature coils secured on a stator yoke through a substrate, a disk-like magnet having N and S poles arranged alternately in the circumferential direction, the magnet being arranged to confront the armature coils, and a rotatable rotor provided with a speed-detecting slit arranged outside the magnet. Rotating power is obtained by applying an electric current corresponding to the magnetic pole of the magnet to each armature coil. A speed detector detects the speed-detecting slit and puts out a frequency pulse voltage proportional to the speed and a counter counts the output pulses from the speed detector to count out the timing to change the excitation phases to the armature coils so as to continuously rotate the rotor. The method of the present invention is characterized in that a stopper to stop the motion of the moving body is arranged so that at a position of a maximum torque of the direct current brushless motor or a predetermined position close to the maximum torque position, the moving body impinges against the stopper to stop rotation of the rotor, the count number in the counter is reset and the motor is then driven in the reverse direction to lead and locate the moving body at a starting position.

摘要翻译： 本发明涉及一种将由直流无刷电动机驱动的打印机的打印头托架等移动体引导到起始位置的方法。 形成本发明一部分的直流无刷电动机包括定子，其包括通过基板固定在定子磁轭上的多个电枢线圈，具有沿圆周方向交替布置的N和S极的盘状磁体， 磁铁布置为面对电枢线圈，以及设置有设置在磁体外部的速度检测狭缝的可旋转转子。 通过将对应于磁体的磁极的电流施加到每个电枢线圈来获得旋转功率。 速度检测器检测速度检测狭缝并输出与速度成比例的频率脉冲电压，并且计数器对来自速度检测器的输出脉冲进行计数，以计算将激励相位改变为电枢线圈的定时，以便连续旋转 转子。 本发明的方法的特征在于，停止移动体的运动的止动件被布置成使得在直流无刷电动机的最大转矩或接近最大转矩位置的预定位置的位置处，移动 主体撞击止动件以停止转子的旋转，计数器中的计数值被复位，然后马达被反向驱动以引导并将移动体定位在起始位置。