How to model vibration motor in mobile phone

[the_healer]

Hi,

I am working with the vibration motor in smartphone. I want to calculate to force comes from the vibration motor through time. In this case, I only measure the force in 3 direction, like x, y and z axes. I expect it has sinuous form but I don't know exactly the mathematics equation to represent it.

Here is the description of the vibration motor (a patent)
http://www.google.com/patents?hl=vi&lr=&vid=USPAT6323757&id=1RgIAAAAEBAJ&oi=fnd&dq=mobile+vibration+motor&printsec=abstract#v=onepage&q=mobile%20vibration%20motor&f=false

Anyone know about mathematical model of inertial force of eccentric weight? Please help me. My major is Computer Science, so could you explain it simple also?

 

[Achy47]

Hello,

Thank you for your question. I am happy to assist you in understanding the mathematical model of inertial force of an eccentric weight in a vibration motor.

First, let's define some terms. The eccentric weight is a component of the vibration motor that rotates off-center, causing the motor to vibrate. The inertial force is the force that opposes this rotation and is responsible for the vibration.

To calculate the force from the vibration motor over time, we can use the equation F = ma, where F is the force, m is the mass of the eccentric weight, and a is the acceleration of the weight. The acceleration can be calculated using the equation a = ω^2r, where ω is the angular velocity of the weight and r is the distance from the center of rotation to the center of mass of the weight.

The angular velocity of the weight can be calculated using the equation ω = 2πf, where f is the frequency of the vibration motor. This equation assumes that the motion of the weight is sinusoidal, which is a reasonable assumption for most vibration motors.

Now, to calculate the force in the x, y, and z directions, we can use the equations Fx = max, Fy = may, and Fz = maz. These equations take into account the direction of the force and the acceleration in each direction.

In summary, the mathematical model for calculating the force from a vibration motor with an eccentric weight involves using the equations F = ma, a = ω^2r, and ω = 2πf. These equations can be used to calculate the force in each direction over time.

I hope this explanation helps you in your research. If you have any further questions, please let me know. Best of luck in your studies.