Pager motor replacement

**Luciano** · - 19th May 2006, 13:51

Ron,

What is the weight and shape of your device?
Where do you put the device? (Desk, pocket, ...).
What is the voltage and capacity of the battery?

Example the motor of the vibrator uses 100 mA:

One second of alert will use 0.027 mAh of the battery.
(100 / 3600 = 0.0277).

Luciano

P.S.
The weight of my Motorola phone was 116 grams with battery.
(116 grams = 4.091 ounces).

**Ron Marcus** · - 19th May 2006, 15:16

Luciano...I've been spoiled! The disk shaped motor I used drew 30 mA at 3 volts DC. The unit it is going in is 1" x 2" and has very little battery capacity. Now some of the motors on Jameco draw 80 mA @ 1.3 volts. I figure I could PWM them with a 40% duty cycle, and effectively cut the average current by the same amount, but I'd like to skin that cat with a sharper knife. I looked on the Digikey webpage, and saw a 20 mm piezo "speaker". I wonder if it can't be driven in such a way as to provide quiet vibrational signalling without the EMF associated with the motors?

**Luciano** · - 19th May 2006, 21:48

Ron,

**Ron Marcus** · - 19th May 2006, 22:03

Nice find Luciano!
I don't see an english contact Email address, but I will do some more research.

Ron

**Luciano** · - 19th May 2006, 23:01

Send them a Fax and ask for the sales Representatives for the United States.

Tokyo Parts Industrial Co., Ltd.
Head Office
236, Hinode-cho, Isesaki-shi,
372-0022 Gunma
Japan

Phone: +81 270 25 2761
Fax: +81 270 23 3626

steveoc · - 22nd March 2007, 20:25

Ron, were you able to get a hold of a US sales rep? If so, how much do these motors cost (roughly).
thanks
steveoc

**Ron Marcus** · - 22nd March 2007, 21:32

I actually never followed up. I took a standard tubular motor and built an adapter to attach it to my board.
Ron

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