1 / 18

Cordless Electric Nailer

Cordless Electric Nailer. Team 27: Nithin Reddy and Mohammad Farooq Shaik Ece 445 Senior Design Project Team 27. Introduction. A battery powered nailer will provide the user with a sense of portability that current models do not.

hector
Télécharger la présentation

Cordless Electric Nailer

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Cordless Electric Nailer Team 27: Nithin Reddy and Mohammad FarooqShaik Ece 445 Senior Design Project Team 27

  2. Introduction A battery powered nailer will provide the user with a sense of portability that current models do not. Our goal is to develop an efficient DC motor controller for the mechanical component of the nailer.

  3. Objectives • Design a low powered DC motor Controller. • Inexpensive. • Develop enough energy to drive a nail. • Create a battery monitoring system.

  4. System Specifications • Input: • 10-18 Vdc • Output: • 15 Vdc±2% • Power Ratings: • 250W Continuous • 500W Peak for 1 minute

  5. System Outline PowerSupply BatteryChargeDisplay PWM UC 3825 Buck Converter Mechanical Component DC Motor H-Bridge Driver LS 7260 H-Bridge Control Module Voltage Regulator Module

  6. Battery Charge Display • Consists of 3 LEDs • Green – Battery is full. • Yellow – Battery is 60-70% full. • Red – Battery is getting low • Variable resistors can adjust the thresholds of the 3 LEDs

  7. Battery Charge Display Testing • Circuit was tested by applying a variety of voltages. • The respective LED lights up for the voltage applied. • If the LED did not light up, it was tested to see if the LED was faulty.

  8. Battery Charge Display Vo >14.5 volts 14.5 V> Vo > 12.5 V 12.5 V> Vo Vo = Battery voltage

  9. Control Module • Pulse Width Modulation (UC3825) • Compares the output voltage from the voltage divider circuit to the internal reference and adjusts the duty cycle accordingly. • H bridge driver (LS7260) • Direct drive control of MOSFETs. • Controls direction of DC motor. • Ability to stop the motor at any instant.

  10. Buck Converter Simulated Boost Converter Output • Step down DC-DC converter. • Maintains constant output of 15 volts.

  11. Buck Converter Testing • Tested the buck converter circuit with varying voltages. • Ensured that the output voltage was 15 volts regardless.

  12. H Bridge • 4 MOSFETS( 2 P type and 2 N type). • 2 MOSFETS are on at one time. • Controls the direction of the motor.

  13. H Bridge • When S1 and S4 are on, the motor moves in an anticlockwise direction • When S2 and S3 are on, the motor moves in a clockwise direction

  14. Mechanical Component • Currently being created by mechanical engineering senior design team • Motor will rotate and will cause spring to compress and expand. Expanded Spring Collapsed Spring

  15. Successes • Battery powered. • Low Power Requirement. • Inexpensive. • Ability to control motor direction.

  16. Difficulties • Speed control of the DC motor with the PWM chip. • Winding of the Inductor. • Searching for high current resistant MOSFETS. • Understanding Chip Functionality.

  17. Recommendations • Finalize circuit design before submitting a PCB request. • Obtain compatible high power motors to test at desired power levels. • Use Power Lab: Less crowded, Familiar Equipment and access to motors. • PCB layout to improve efficiency and avoid parasitics (stray capacitance and inductance).

  18. Questions?

More Related