The present invention relates to a motor drive overcurrent detecting unit, a motor driving circuit without a headroom voltage loss, and a method for detecting an overcurrent in a motor driving circuit. A spiral conducting plate is disposed around the flow conducting tube. This invention can generally store multiple measurements such as length and angles, measure the length of flex trim material as it is dispensed from the device, crease the material, apply predetermined amount of mastic, and automatically cut the flex trim material to each length previously input. The material gas flows in a space between the plurality of grooves and the dielectric, in a direction transverse to the grooves. A shaft is inserted into the opening and one end of the shaft is supported in the bearing. For example, wireless data transfer may occur after the detachment or just prior to the reattachment of riser assembly 23 to the underwater installation.