The REMC team presented on the status of their electric vehicle motor controller project. They discussed their mission to design a reliable motor controller for their vehicle that will achieve 85% efficiency and protect components from dangerous conditions. They reviewed the history of past unreliable controllers and outlined their current work reverse engineering the previous design and prototyping an updated power stage board with a new driver chip and MOSFETs. Their goals are to populate the prototype board by semester's end, have the new design fabricated by March 1st, complete in-vehicle testing by March 15th in preparation for the April competition.
QEI produces a variety of single-phase and 3-phase capacitor controllers. Using the easy-to-use QEI SmartWare II software, configure the capacitor controllers to switch capacitor banks based on voltage, kVAR, kW, current, temperature, time, day of the week, and power factor.
https://www.qeiinc.com/?page_id=493
Now there is New an Easy way to configure IGBT Gate Drivers via Software thanks to the Amantys Power Insight Configuration Tool.
-Configure an IGBT Gate Driver in Seconds (Rg(ON/OFF) , td(ON/OFF)…)
-Fine Tune IGBT Switching on the field
-Single and Double Pulse Patterns generator for faster prototyping
-Reduce R&D Time.
-Read Events
-And much More
Applying Machine-Learning and Natural Language Processing tools in an attempt to better predict article virality for BuzzFeed; a Data Science capstone project.
QEI produces a variety of single-phase and 3-phase capacitor controllers. Using the easy-to-use QEI SmartWare II software, configure the capacitor controllers to switch capacitor banks based on voltage, kVAR, kW, current, temperature, time, day of the week, and power factor.
https://www.qeiinc.com/?page_id=493
Now there is New an Easy way to configure IGBT Gate Drivers via Software thanks to the Amantys Power Insight Configuration Tool.
-Configure an IGBT Gate Driver in Seconds (Rg(ON/OFF) , td(ON/OFF)…)
-Fine Tune IGBT Switching on the field
-Single and Double Pulse Patterns generator for faster prototyping
-Reduce R&D Time.
-Read Events
-And much More
Applying Machine-Learning and Natural Language Processing tools in an attempt to better predict article virality for BuzzFeed; a Data Science capstone project.
Automatic Power Factor Correction Using Arduino UnoVineetKumar508
It calculates the power factor of load using ZCD and an Arduino program based on P.F. it determines the
how much compensating element should be added to load to make P.F. near to unity. You can also add IoT to monitor the power consumption, Voltage, Current an P. F. of the load remotely.
How to Start your Large Motors- typical Solutions or new motor design?Delcho Penkov
In the context of low oil prices and an increasing demand for cost reduction of the electrical installations, optimizing the starting solution of high power electrical motors could be highly contributive. Direct on-line start is the most common solution today, being also the simplest and most cost-effective but it may generate voltage dip during start and stresses mechanically the machine and load. Progressive starting solutions, as auto-transformer, soft-starter or variable speed drive, solve the electrical and mechanical constraints in variable levels, related to their complexity. Today, in addition to the progressive starting solutions, motor manufacturers propose to design the motors as to reduce their inrush current, in some cases down to 300% of the rated current.
In this tutorial different solutions for large motor starting will be explored and compared, with respect to their application field, flexibility of adaptation, complexity during installation and set-up, overall performances and technical and economical aspects. Some guidelines for selection will be also discussed. In the scope of analyses are traditional methods, such as direct on-line, auto-transformer, soft-starter and variable speed drive and also recent solutions as motors designed with reduced inrush current.
3. History
• 2014 Shell Eco Marathon (SEM) mandates student-
designed Motor Controllers
• 2013-14 HEEV team designs two motor controllers
• V 1.0
• Used Allegro MOSFET driver, proved unreliable
• V1.1
• Tried custom-making MOSFET driver, proved
unreliable
7. History
• 2014 Shell Eco Marathon (SEM) mandates student-
designed Motor Controllers
• 2013-14 HEEV team designs two motor controllers
• V 1.0
• Used Allegro MOSFET driver, proved unreliable
• V1.1
• Tried custom-making MOSFET driver, proved
unreliable
8. REMC Mission
• Design a reliable motor controller for Sting,
Cedarville’s all-electric prototype vehicle, which
will be entered in the 2015 Shell Eco Marathon. The
motor controller must be designed for at least 85%
efficiency and must protect itself and the other
electrical components in the system from
dangerous conditions that might exist during the
race.
9. DC Motor Theory
• Rarmature sets current
• Current controls motor
torque
• Motor torque spins wheels
11. Suspected Problems
• Transient Over-voltages
• Transient Over-currents
• Excessive Switching losses in MOSFETs
• Improper feedback control
12. Parasitic Capacitance and Inductance
• Parasitic Capacitance occurs when two traces are
too close together
• Parasitic Inductance happens when the traces
form inductance loops
13. Control System
• Feedback Control Loop
• Data gathering
• Current tasks:
• Currently deciphering code
• Adjusting code to V1.0
21. Responsibilities/Progress
• Plan of Action
• Background Research
• Reverse Engineering
• Version 1.0 Prototype Board
• New Components
• Expected Results
31. Boot Cap and Gate Resistors
• Boot Cap Formula: CBOOT = (QGATE × 20 )/ VBOOT
• Purpose
• Duty Cycle Adjustment
• PWM Frequency
• Voltage Drop Across MOSFET gate
• Gate Resistors
35. Deadlines
• Populate Prototype Board by end of Fall semester
• Redesigned PCB fabricated by 1 March
• In-vehicle testing by 15 March
• Competition April 9th