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Detailed Introduction on Vibration Motors

By Elina | Published on Dec 11,2015


What is a vibration motor? Vibration motor is a compact size coreless DC motor used to informs the users of receiving the signal by vibrating, no sound. Vibration motors are widely used in a variety of applications including cell phones, handsets, pagers, and so on. The main features of vibration motor is the magnet coreless DC motor are permanent, which means it will always have its magnetic properties (unlike an electromagnet, which only behaves like a magnet when an electric current runs through it); another main feature is the size of the motor itself is small, and thus light weight. Moreover, the noise and the power consumption that the motor produce while using are low. Based on those features, the performance of the motor is highly reliable. The vibration motors are configured in two basic varieties: coin (or flat) and cylinder (or bar). There are some components in both of their internal constructions.


Rotor: The rotor is the non-stationary part of a rotary electric motor. The wires and magnetic field of the motor are arranged so that a torque is developed about the rotor's axis. In some designs, the rotor can act to serve as the motor's armature, across which the input voltage is supplied.


Stator: The stator is the stationary part of a rotary electric motor. It could be worked as the magnet field and interact with the armature to create motion. Another function of the stator is it could act as the armature, which receives its influence from moving field coils on the rotor.

Commutator: A commutator is a rotary electrical switch in certain types of electric motors or electrical generators that periodically reverses the current direction between the Chen 6 rotor and the external circuit. In a motor, it applies power to the best location on the rotor, and in a generator, picks off power similarly. As a switch, it has exceptionally long life, considering the number of circuit makes and breaks that occur in normal operation.


Coin-type Vibration Motor: The need for smaller, thinner designs led to the adaptation of brush motor technology into the coin-type vibration motor. Figure 4 is an internal construction diagram of the brush coin-type motor. Similar to the bar-type vibration motor, coin-type vibration motor is comprised of a weight, a ring magnet, rotor with commutation points attached in the front and coils assembled on the back, and power supplied brushes attached to the ring magnet. The commutation points, which are the yellow part on the bottom pic, are in contact with the end of the brushes.


The relationship between torque and speed is called a characteristic of the operating system. This DC vibration motor's characteristic varies based on three different magnetization sources: separately excited field, self-excited field or permanent field, which is used selectively to control the motor over the mechanical load's range. Beside these requirements, some restrictions exist as well that limit the motor selection. The major constraint on motor operation is thermal in nature. The heat a motor must dissipate can always be calculated as follows: Pdis = I^2 x R Heat dissipated= current through the motor squared, multiplied by the terminal resistance. The current through a motor is determined by the torque the motor produces. Current and torque are related by the torque constant of the motor: I = Mo / kM Current through motor = torque produced divided by the torque constant.


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