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I have a product that uses a flat 12 mm diameter pager motor for silent signaling. I bought them surplus by the hundred, and as happens, they have run out. It ran at 3 volts, drawing 30 mA. Does anyone have a line on a similar part? I've seen some on line, but they draw 100 mils. Since the device is battery operated, I am trying to keep the draw as low as possible.
I am surprised that there isn't some piezo counterpart that can do the same thing more efficiently without noise.
Ron,
Type "pager vibrator" in Google.
(Sorry if you get also the wrong vibrators).
Example: (Pager vibrator!)
http://www.73.com/a/0185.shtml
* * *
The vibrator of a Motorola phone draws 180 mA at 3V.
(The phone uses a 3.6V battery).
Best regards,
Luciano
"The vibrator of a Motorola phone draws 180 mA at 3V."
I need something under 80 mA @ 3 volts.
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.
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
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
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).
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?
Ron,
http://www.techtuit.com/english/images/01.jpg
See this one:
Model: FM37E
http://www.tokyoparts.co.jp/pdf/FM37A-E.pdf
(You will have to print the PDF in order to see the details).
****
(See Pager motors)
http://www.tokyoparts.co.jp/e2-006.htm
Address:
http://www.tokyoparts.co.jp/e1-001.htm
PDF files below are from this page:
http://www.tokyoparts.co.jp/2-009.htm
http://www.tokyoparts.co.jp/pdf/FM37A-E.pdf
http://www.tokyoparts.co.jp/pdf/PM11V.pdf
http://www.tokyoparts.co.jp/pdf/FM88E.pdf
http://www.tokyoparts.co.jp/pdf/FM64G.pdf
****
Also here you can find the FM37E:
http://www.techtuit.com/english/index21.html
The FM37E is on this page:
http://www.techtuit.com/korea/seihin-motor.html
****
They are using the FM37E in the paper below.
http://www.ece.ubc.ca/~elec518/previ.../papers/Ng.pdf
****
Good luck!
Luciano
Nice find Luciano!
I don't see an english contact Email address, but I will do some more research.
Ron
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
Ron, were you able to get a hold of a US sales rep? If so, how much do these motors cost (roughly).
thanks
steveoc
I actually never followed up. I took a standard tubular motor and built an adapter to attach it to my board.
Ron