A list of four questions was written before any more testing on the motor was done.
The slow ramping program was given a serial command so it would constantly display the speed. To test, the speed was slowly increased and when the motion was detected the current duty cycle was recorded. On the first attempts, the duty cycle reached 90% before there was any motion. The H-Bridge was exchanged for one that hadn’t released any smoke. Then the same program reported that only 35% duty cycle was necessary to move the motor. For this reason, the H-bridge was scrapped.
Despite a fully-functional H-bridge in the project it still ran hot. The heat sink became hot to the touch after a few seconds of running. To demonstrate, an infrared thermometer was pointed at the heat sink while some basic motion was demonstrated. The program had been changed to never use less than 35% duty cycle so the motor is very responsive to the buttons going forward and reverse.
Downloads:
The rest of the posts for this project have been arranged by date.
First time here?
Completed projects from year 1.
Completed projects from year 2.
Completed projects from year 3.
Disclaimer for http://24hourengineer.blogspot.com/
This disclaimer must be intact and whole. This disclaimer must be included if a project is distributed.
All information in this blog, or linked by this blog, are not to be taken as advice or solicitation. Anyone attempting to replicate, in whole or in part, is responsible for the outcome and procedure. Any loss of functionality, money, property or similar, is the responsibility of those involved in the replication.
All digital communication regarding the email address 24hourengineer@gmail.com becomes the intellectual property of Brian McEvoy. Any information contained within these messages may be distributed or retained at the discretion of Brian McEvoy. Any email sent to this address, or any email account owned by Brian McEvoy, cannot be used to claim property or assets.
Comments to the blog may be utilized or erased at the discretion of the owner. No one posting may claim property or assets based on their post.
This blog, including pictures and text, is copyright to Brian McEvoy.
2016-12-05 (M)
- What is the minimum duty cycle to turn the motor?
- Will an initial jolt of full power make the motor turn at low duty cycles?
- What is the effect on the motor when full power is applied?
- Does the motor need a small jolt to make the teeth mesh?
The slow ramping program was given a serial command so it would constantly display the speed. To test, the speed was slowly increased and when the motion was detected the current duty cycle was recorded. On the first attempts, the duty cycle reached 90% before there was any motion. The H-Bridge was exchanged for one that hadn’t released any smoke. Then the same program reported that only 35% duty cycle was necessary to move the motor. For this reason, the H-bridge was scrapped.
Yes, that's a pink phone holder
Despite a fully-functional H-bridge in the project it still ran hot. The heat sink became hot to the touch after a few seconds of running. To demonstrate, an infrared thermometer was pointed at the heat sink while some basic motion was demonstrated. The program had been changed to never use less than 35% duty cycle so the motor is very responsive to the buttons going forward and reverse.
Narrated video of H-bridge demonstration
Downloads:
- Gears
- Panel layout PDF or DWG
- S Symbol Plate OpenSCAD source or STL model
- Ultrasonic flush-mount source or STL
- Internal ring gear
- Spring hub includes source and STL for metric and imperial
- Slow ramping Arduino sketch
- 1 Small Arduino Micro
- 2 Stereo potentiometers (10K)
- 4 Multi-turn potentiometers (10K)
- 2 Twelve volt DC motors
- 1 Dual H-bridge
- 2 Ultrasonic distance sensors
- 1 Sine wave generator or the Amazon version
- 1 Voltage Regulator
- 1 Twelve volt three amp power supply
The rest of the posts for this project have been arranged by date.
First time here?
Completed projects from year 1.
Completed projects from year 2.
Completed projects from year 3.
Disclaimer for http://24hourengineer.blogspot.com/
This disclaimer must be intact and whole. This disclaimer must be included if a project is distributed.
All information in this blog, or linked by this blog, are not to be taken as advice or solicitation. Anyone attempting to replicate, in whole or in part, is responsible for the outcome and procedure. Any loss of functionality, money, property or similar, is the responsibility of those involved in the replication.
All digital communication regarding the email address 24hourengineer@gmail.com becomes the intellectual property of Brian McEvoy. Any information contained within these messages may be distributed or retained at the discretion of Brian McEvoy. Any email sent to this address, or any email account owned by Brian McEvoy, cannot be used to claim property or assets.
Comments to the blog may be utilized or erased at the discretion of the owner. No one posting may claim property or assets based on their post.
This blog, including pictures and text, is copyright to Brian McEvoy.
2016-12-05 (M)
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