tailieunhanh - Robot Builders Source Book - Gordon McComb Episode 1 Part 2

Tham khảo tài liệu 'robot builders source book - gordon mccomb episode 1 part 2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 22 ACTUATORS-MOTORS Cross Comparison Chart The following table shows the relationships between the most commonly used torque specifications ounce-inches pound-inches pound-feet Newton meters and kilograms per force meters. oz-in lb-in lb-ft Nm kgf-m 1 16 1 192 12 1 1 1416 1 Specifications in Horsepower AC-operated motors are often specified in horsepower hp rather than torque. While both horsepower and torque represent the strength of the motor they are not the same thing. Specifically horsepower calculations also include the amount of work performed during a period of time such as one second while torque does not. Small DC-operated motors for amateur robotics are not rated in horsepower because the ratings are less than 1 50 or even 1 100 hp. Manufacturers rely on horsepower ratings for larger motors you may see it for big brute motors intended for electric wheelchairs. For the curious 1 hp is equal to 550 lb-ft per second or kgf-m per second. Converters on the Web Several motor manufacturers and other Internet resources offer torque converter calculators on their Web sites. Check the following Bodine Electric http Online Conversion http Convert Me http Anatomy of a Permanent Magnet DC Motor By far the most common motor used in amateur robotics is the small permanent magnet PM variety. It runs off direct current DC and comes in thousands of shapes and sizes. But despite all the variations of PM motors they all work about the same. A Peek Inside At the center of the motor is the central shaft wrapped around this shaft is a core of windings called the armature. The armature turns within a cavity of the motor that is made of magnets. Though multiple sets of magnets may be used the fundamental design of PM motors uses two field magnets one with its north pole facing the armature and one with its