Miniature Motor Offers Vibration Tactile Feedback

Sized 8mm in diameter, Microdrives new Pico Haptic miniature coin vibration motor is its smallest yet and suitable for handheld alerting precision, such as that used by mobile phones in silent mode. This development reduces the footprint of the previous smallest coin motor by 2mm, helping engineers to miniaturise handheld designs further. Miniature vibration motors such as the 308-100 are used in a wide range of applications, particularly handheld, where there is a need to alert an operator or user that an event has happened.

This mode of operation is classed as 'operator / user alerting', and the vibrating motor has much the same function as an 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 good example of where vibration tactile feedback can alert users in a wide range of situations, irrespective of where the phone is actually located. The new shaftless vibration motor, part-number 308-100 has external dimensions of 8 x 3.4m and weighs 0.7g.

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 12,000RPM (200Hz) and generates 0.5g (4.91m/s) 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 six-pole voice-coil design. Typical current draw is 100mA and the motor has a typical vibration efficiency of 3.2g/W.

The motor is quiet by vibration standards with a typical noise output of 50dBA, and has a standard operating temperature of -20C to 60C, though these can be extended by request. It 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 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 its engineering support team.

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