tailieunhanh - McGraw-Hill - Robot Mechanisms and Mechanical Devices Illustrated - 2003 Part 5

Tham khảo tài liệu 'mcgraw-hill - robot mechanisms and mechanical devices illustrated - 2003 part 5', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 64 Chapter 1 Motor and Motion Control Systems noids are specified for higher-end applications such as tape decks industrial controls tape recorders and business machines because they offer mechanical and electrical performance that is superior to those of C-frame solenoids. Standard catalog commercial box-frame solenoids can be powered by AC or DC current and can have stnkees that in. 13 mm . Tubular Solenoids The coils of tubular solenoids have coils that are completely enclosed in cylindrical metal cases that provide improved magnetic circuit return and better protection against accidental damage or liquid spillage. These DC solenoids offer the highest volumetric efficiency of any commercial solenoids and they are specified for industrial and military aerospace equipment where the space permitted for their installation is restricted. These solenoids are specified for printers computer disk-and tape drives and military weapons systems both pull-in and push-out styles are available. Some commercial tubular linear solenoids in this class have strokes up to in. 38 mm and some can provide 30 lbf 14 kgf from a unit less than in 57 mm long. Linear solenoids find applications in vending machines photocopy machines door locks pumps coin-changing mechanisms and film processors. Rotary Solenoids Rotary solenoid operation is based on the same electromagnetic principles as linear solenoids except that their input electrical energy is converted to rotary or twisting rather than linear motion. Rotary actuators should be considered if controlled speed is a requirement in a rotary stroke application. One style of rotary solenoid is shown in the exploded view Figure 1-52. It includes an armature-plate assembly that rotates when it is pulled into the housing by magnetic flux from the coil. Axial stroke is the linear distance that the armature travels to the center of the coil as the solenoid is energized. The three ball bearings travel to the lower ends of the .