Haptic motor

Projects / Project Swiftlet 

Haptic motor app notes:
http://www.precisionmicrodrives.com/application-notes-technical-guides

That means that the motors should be parallel to the glasses frame.

The mobile phone parts are a god sent for this project as they are optimized for cost, size, weight and power which is what I am after.

Today, I have ordered 20pcs of mobile phone vibration motors from aliexpress for $8.28 US with "Free shipping" via registered mail. Not sure what I want to do with the rest of them yet. :)

Compared to the usual ones I found, these are much more suited for SMT onto a PCB directly. They have a flat surface and the rotating mass is within the height envelope. Even if they melt or degauss inside my toaster oven, I can at least glue them. The other ones I found have wires, in cylindrical shape or have the weight overhanging. They'll cost more to handle them for manufacturing to strap/glue/make plastic part to hold them.

Motor specifications: 

• 4*4.5mm (it is a 4*8 coreless motor after remove shell)
• The motor length: 8mm (excluding eccentric)
• Eccentric specifications: 3*3.5*3.8 mm
• Voltage:1.5 V current:60 mA
• Voltage:2 V current:80 mA
• Voltage:3 V current:115 mA
• working voltage range is 1.5V-3V,the rated voltage is 2V.

(edited changes the units.  Someone have no clue about unit usage: MA, MM.  M means Mega!)

It is smaller than I thought and that's a very good news. The power requirement is reasonable. Not sure if I am going to use a buck converter to step down the voltage first or drive them from battery and account for that using PWM.

BTW: If you are lazy, use a LDO with an enable pin for driving these. The LDO even has thermal and short circuit protection and the enable pin can be directly driven from an I/O pin of a microcontroller. Probably should add a 0.1uF cap in addition to whatever the datasheet recommends across the motor to reduce the electrical noise.

Haptic feedback:

"Study on Perception of Vibration Phythm", Daiji Kobayashi, Chitose Institute of Science and Technology, Hokkaido, Japan. d-kobaya@photon.chitose.ac.jp

published in "Human Interface and the Management of Information. Information and ..., Part 1" edited by Sakae Yamamoto