tailieunhanh - Motion Control Theory Needed In The Implementation Of Practical Robotic Systems 2 Part 3

Tham khảo tài liệu 'motion control theory needed in the implementation of practical robotic systems 2 part 3', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Chapter 3 The State of the Motor Control Industry This model produces the Velocity Volts transfer function s ----7 F ù .1 1 F s 4F Ri RF KtKb J L J LJ The parameters L and R are usually given in standard metric units. The parameters J and F are usually easily convertible to standard values. However Kt and Kb can present difficulties. When all parameters have been converted to standard units as Ramu 6 does Kt and Kb are have the same value and can be represented with one parameter. When motor manufacturers supply Kt and Kb value they are usually used for motor testing and not for modeling and are therefore in a convenient unit for testing such as Volts 1000 RPM. This would still not be a difficulty if not for the Brushless motors the standard units for Ke use voltage per phase but Ke is often printed using line-line voltage the standard units of Kt are per pole pare but Kt is usually printed in total torque for the entire motor. The solution to the units confusion is to ask each manufacturer most companies use units that are consistent across their literature. A more common solution is to bypass modeling parameters and provide torque-speed curves for each motor. In 8 the author provides the torque-speed curve generating program shown in Figure . This program is useful for both generating the torque-speed curve for a given set of parameters and manually adjusting parameters to find possible values for a desired level of performance. Most motor manufacturers will provide either torque-speed curves or tables of critical points along the torque-speed curve in their catalog. Some manufacturers will provide complete motor and system sizing software packages such as Kollomorgen s MOTIONEERING 9 and Galil s Motion Component Selector 10 . These programs collect information about the load reducers available power and system interface and may suggest a complete system instead of just a motor. They usually contain large motor databases and can provide all the motor .

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