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Precision Microdrives Limited

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Precision Microdrives Releases Worlds Smallest Coin Vibration Motor at 8mm Diameter

London, United Kingdom, March 14, 2011 --( Precision Microdrives recently introduced the worlds smallest form factor coin vibrator motors into its range of Pico Haptic™ miniature vibrating motors. This development reduces the footprint of the previous smallest coin motor, by 2mm. A small but important step in helping engineers miniaturise handheld designs further.

Miniature Vibrator Motors like the 308-100 are used in a very wide range of applications, particularly handheld, where there is a need to alert an operator or user that an event has happened. Unsurprisingly Precision Microdrives class this mode of operation as ‘operator / user alerting’, and the vibrating motor has much the same function as a LED, lamp, buzzer or audio alarm.

The benefit of the vibration motors, and vibration tactile feedback in general (also known as haptic feedback) is that it works in situations where users can’t see or hear the device (for whatever reason). The silent profile in most mobile phones is a great example of where vibration tactile feedback can alert users in a wide range of situations, irrespective of where the phone is actually located.

That’s the premise of the Pico Haptic™ range of motors. Precision Microdrives manufacture a wide range of vibrator motor form factors in miniature scales from 4mm through to 12mm motors which are easy to integrate into designs. The company offer PCB mounted vibrating motors, including spring connect, reflow SMD and through-hole solder types. Precision Microdrives also produce self-adhesive mounting vibration motors and motors designed with rubber surrounds for easy mounting within enclosures.

The new shaftless vibration motor, part-number 308-100 has external dimensions of 8mm diameter x 3.4mm height and weighs just 0.7 grams. The 8mm coin vibration motor is based on the same proven technology as the 10 and 12mm diameter coin motors that offered reliable vibration feedback in mobile phones, handheld instruments and medical devices.

Rated at 3v DC, this vibration motor runs at 12,000 RPM (200 Hz) and generates 0.5g (4.91 m/s²) of vibration. The 308-100 has the usual higher guaranteed starting voltage of 2.3v for motors of this type, which is due to the 6-pole voice-coil design. Typical current draw is 100mA, and the motor has a typical vibration efficiency of 3.2 g/W. The motor is quiet by vibration standards with a typical noise output of 50dBA, and has a standard operating temperature of -20°C to 60°C, though these can be extended by request.

Physically this coin vibrating motor comes with 45mm AWG32 flying leads and a high strength long life 3M self-adhesive pad on the underside, which is used to secure the motor to the application enclosure or PCB. As with all Precision Microdrives vibration motors, these leads can be modified at request and a range of suitable crimps and connectors can be added to specification by asking the engineering support team at

About Precision Microdrives
Precision Microdrives carries the worlds most comprehensive range off-the-shelf range of DC vibration motors over 3 ranges, from 4mm diameter to 60mm diameter. All standard motors are available for same day dispatch, worldwide.

The company have successfully introduced many best practice methods of adding / integrating vibration motors into new and existing products, and their website offers a lot of that detailed best practice knowledge freely for easy and quick viewing.

Of course the company also have an experienced customer engineering support team that are available to help designers, engineers and production teams, as they integrate vibration feedback into their designs and products. Often customers want customisations made to vibration motors; this is no problem and Precision Microdrives offer custom modifications from minimum order quantities of 100 pcs upwards. For a modification or two contact the engineering team at, and they’ll be happy to propose a way forward.

Contact Information
Precision Microdrives Limited
Thomas Arundel
+44 (0) 1932 252482

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