* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Short-Term Incumbent Worker Training Module Course - e
Utility frequency wikipedia , lookup
Electrical substation wikipedia , lookup
History of electric power transmission wikipedia , lookup
Three-phase electric power wikipedia , lookup
Power inverter wikipedia , lookup
Pulse-width modulation wikipedia , lookup
Switched-mode power supply wikipedia , lookup
Commutator (electric) wikipedia , lookup
Power engineering wikipedia , lookup
Mains electricity wikipedia , lookup
Electric machine wikipedia , lookup
Power electronics wikipedia , lookup
Electrification wikipedia , lookup
Rectiverter wikipedia , lookup
Alternating current wikipedia , lookup
Voltage optimisation wikipedia , lookup
Electric motor wikipedia , lookup
Brushed DC electric motor wikipedia , lookup
Brushless DC electric motor wikipedia , lookup
Induction motor wikipedia , lookup
Curriculum Outline Module Title: DC Drives and DC Motor Control Module Number: Length: 16 Contact Hours Credit Hours: 1 Credit Hour Module Description: This course provides the fundamental skills in DC motor controllers for entry-level electrical maintenance personnel. Prerequisite training for this course is completion of an AC/DC course, or equivalent training. Goal of Training: Skills from this training assist in the installation, configuration, and troubleshooting of DC motor controllers which will reduce unplanned machinery down time, improve production efficiency, and enhance employee job satisfaction and employee value to the production process. Reference Material: Each participant receives Allen-Bradley Bulletin 1365 DC Drive User Manual. Module Elements (list of topics or segments): 1) 2) 3) 4) 5) 6) 7) 8) Magnetism Motor mechanical parameters Motor electrical parameters DC motor design and operation Rectifiers and inverters DC drives Typical DC drive construction Parameters programmed into DC drives Course Objectives: At the completion of this course, the participant will be able to… 1) Understand magnetism a) Magnetic variables - magnetomotive force, flux, reluctance, permeability b) Magnetic poles 1 c) Inductance d) Transformers e) Motors 2) Understand motor mechanical parameters a) Torque b) Speed c) Shaft design d) Frame size e) Bearings and friction f) Temperature ratings/insulation class 3) Understand motor electrical parameters a) Service voltage/motor voltage b) Full load amps c) Horsepower/kilowatts d) Phase (AC only) e) Frequency (AC only) f) Locked rotor current g) Service factor 4) Understand the design of DC motors a) Brush motors and commutators b) Brushless motors 5) Understand the operation of DC motors a) Commutation b) Switching with brushless DC motors 6) Understand the creation of DC power a) Rectifiers b) Inverters 7) Understand DC drives a) Creating different DC voltage levels b) Current and power consumption c) Overload protection d) Short circuit protection 8) Understand typical DC drive construction a) Earlier relay control b) Connection to motor c) Power supply and circuit protection d) Power switching e) Display and data entry 2 9) Understand typical operating parameters used in DC drives a) Start/stop/jog/reverse b) Output voltage c) Output speed d) Status/fault indication Session 1 Length: 4 Hours Recommended Schedule: Segments: 1) 2) 3) Magnetism Motor mechanical parameters Motor electrical parameters Assignments and Activity Notes: Lecture topics: Magnetism Flux, flux density, reluctance, permeability, magnetomotive force Magnetic poles Inductance, self- and mutual Inductors Transformers Electrical-magnetic analogies Magnetic forces in motors Motor mechanical parameters Torque Speed Shaft design, keys, keyways Frame size, dimensions, mounting configuration Friction, bearings, lubrication 3 Temperature ratings, insulation class Effects of heat and friction on motor Motor electrical parameters Service voltage, motor voltage, resistance in leads Full load amps Horsepower, kilowatts DC, 3-phase AC, 1-phase AC power Frequency (AC, DC=0 frequency) Locked rotor current Service factor Determining the size motor needed for an application Discussion: Ask participants for their name and background, if they work in industry, if their facility uses any DC motors that they know of, and how those DC motors are employed. Demonstrations: Show the participants examples of DC motors Identify the various components of the DC motor Activities Give participants a multiple choice quiz (25 questions); provide a prize (e.g., Radio Shack gift certificate) to the highest scoring participant. Instructor Remarks: Supplemental activities should involve the student’s retention of information. Quiz the students by putting some symbols on the dry erase board or chalkboard and have them identify them. This can also be done in reverse by providing the name of the fitting and having the students draw the appropriate symbol. Criticism should reinforce the student’s learning and encourage them to correct any wrong answers. Instructors may also provide a print that requires students to identify components, or take a pictorial and draw a sketched print using appropriate symbols. 4 Session 2 Length: 4 Hours Recommended Schedule: Segments: 4) DC motor design and operation Assignments and Activity Notes: Lecture topics: DC motor design Brush DC motors - series, shunt, compound Brushless DC motors DC motor operation Commutation Switching for brushless DC motors Discussion: Lab and demonstration results Demonstrations: Show the connection and operation of a brush DC motor Show a simple control circuit and operation of a brushless DC motor Activities Have participants connect voltmeters and ammeters to DC motors, and compute the power drawn for various loads. Instructor Remarks: This session is to reinforce the concepts learned in the first session and provide the students with more hands-on activities related to the components used in the field. As the session is heavy in hands-on activities, it is 5 a good practice to keep a close eye on the students at all times to ensure a high quality of work. Session 3 Length: 4 Hours Recommended Schedule: Segments: 5) Rectifiers and Inverters 6) DC Drives 7) Typical DC Drive Construction Assignments and Activity Notes: Lecture Topics: Rectifiers and inverters The structure of DC waveforms The structure of DC The rectification process Circuits used as rectifiers The invertion process Circuits used as inverters DC drives Creating different DC voltage levels Current and power consumption of the DC drive Overload protection Short circuit protection Typical DC drive construction Earlier relay control Connection to motor Power supply and circuit protection Power switching 6 Display and data entry Discussion: Lab and demonstration results Demonstrations: Show participants a properly connected DC drive and motor Activities Have participants connect a DC motor to a DC drive. Review their work. Have them attempt to start the motor. Show them the minimum parameters needed to get the motor running. Instructor Remarks: Demonstrations should emphasize not only safe tool use, but also proper tool selection. Exercises are sequenced to build off of previous activities and build awareness of the intricacies of the trade. By the end of this session, students should have a fundamental knowledge of the equipment as well as some practical knowledge of solving some basic drive or motor problems. Session 4 Length: 4 Hours Recommended Schedule: Segments: 8) Parameters programmed into DC drives Assignments and Activity Notes: Lecture topics: Parameters programmed into DC drives Start-stop-jog-reverse 7 Output voltage Output speed Status, fault indication Discussion: Lab and demonstration results Demonstrations: Show participants a properly connected Inverter DC drive and motor Activities Have participants modify various parameters for the drive and log the results. Present the participants with a problem and see if they are able to correctly modify the parameters to get the desired result. Connect the DC motor to a convyor system (or similar) and have students control operation of the system. Instructor Remarks: Demonstrations should emphasize not only safe tool use, but also proper tool selection. Exercises are sequenced to build off of previous activities and build awareness of the intricacies of the trade. By the end of this session, students should have a fundamental knowledge of the equipment as well as some practical knowledge of solving some basic drive or motor problems. 8 Module Instructional Resources Supplemental Materials (texts manuals, booklets, handouts): Reference Material: Each participant receives Allen-Bradley Bulletin 1365 DC Drive User Manual, published by Rockwell Automation. Hardware/Software: Websites: Allen Bradley Company http://www.ab.com Baldor Co. http://www.baldor.com Square D Co. http://www.squared.com Consumable materials and supplies: 14 AWG wire, electrical tape, and a variety of terminal connectors. Other: Graph paper Evaluation/Assessment and Grading Written Assessment: Trainees must correctly describe DC drive control systems with at least 75% accuracy. Practical application must be built to an acceptable standard including level, accurately measured, supported, functional without leaks. Also, all hands-on challenges must be performed independently. Attendance: All trainees missing any training events must notify the instructor in advance to be considered for make-up activities. In order to pass, trainees must not miss more than 4 hours of instruction. Make-up time may be offered to the trainee, according to the excused absence policy. Participation: Trainees must demonstrate their abilities to independently perform selected hands-on activities. Many hands-on training events are performed in pairs and everyone is expected to be a productive team member. This product was funded by a grant awarded under the President’s High Growth Job Training Initiative as implemented by the U.S. Department of Labor’s Employment & Training Administration. The information contained in this product was created by a grantee organization and does not necessarily reflect the official position of the U.S. Department of Labor. All references to non-governmental companies or organizations, their services, products, or resources are offered for informational purposes and should not be construed as an endorsement by the Department of Labor. This product is copyrighted by the institution that created it and is intended for individual organizational, non-commercial use only. 9