Pager motor replacement

**Ron Marcus** · - 17th May 2006, 01:48

"The vibrator of a Motorola phone draws 180 mA at 3V."

I need something under 80 mA @ 3 volts.

**sayzer** · - 17th May 2006, 08:46

I am far away from this area but just as an idea why don't you look for tiny bobbin conductors?

You know, the ones that create magnetic field and pushes a tiny metal pin forward and pulls backward hundreds of times in a second, and thus creates a vibration.

I am sure the current is around your needs.

**Luciano** · - 17th May 2006, 09:21

Ron,

Check the page:
http://www.73.com/a/0185.shtml

Examples on that page:

Type 1: (38,000 AVAILABLE)
Operates on 1.3VDC@80MA. 7/8" x 3/8" x 1/4". Used in pagers, cell phones and vibrating batteries. 1-1/2" leads with mini 2 pin connector. $2.45 Ea/100, $1.95 Ea/1000. 93 in stock MC099

Type 2:
Low voltage, low current miniature vibrating motor. Operates on 1.5 - 3 VDC @ 62 mA. Tiny motor with offset weighted shaft is used in cell phones and pagers for vibrating alert signal. A removable black rubber boot surrounds the motor and provides a flat mounting surface. Without the rubber boot the motor measures 0.24" dia. x 0.5" long. The shaft and weight add an extra 0.21" to the overall length. Prepped with 0.42" long metal tabs. $1.95 Ea/100. ME235

* * *

The info about the vibrator of a Motorola phone was just to help you
when you search on the WEB. The vibrator was in a GSM phone I purchased
back in the year 2001.

* * *

Best regards,

Luciano

**Ron Marcus** · - 19th May 2006, 14:10

Thanks for the leads. It looks like Jameco has a good selection, but the current draw is still up there. Once again, I can't believe there isn't some other silent signalling device that is more efficient out there. If only small Piezos could be used for low frequency...

Ron

**Luciano** · - 19th May 2006, 14:51

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, 16:16

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, 22:48

Ron,

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