Structure and principle of vibration motors

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A vibration motor consists of a special motor coupled with an excitation weight. When the motor is powered on and rotates, the excitation block generates an excitation force, which is transmitted to the mechanical structure through the motor feet or flanges to produce longitudinal and transverse vibrations. 　　The special motor consists of a custom stator winding and a rotor shaft, and is capable of withstanding high-frequency vibrations ； The horizontal vibration motor uses four fan-shaped eccentric blocks as excitation elements; by adjusting the angle between the two eccentric blocks at the coaxial end, it is possible to regulate the excitation force of the vibration motor from zero to its maximum value ； Vertical vibration motor, using two eccentric blocks as excitation elements, one at each end of the shaft; the eccentric block at the upper shaft end is fixed, while that at the lower shaft end is adjustable. A set of additional blocks is installed on the outside of each upper and lower eccentric block; by adjusting the number of these additional blocks, it is possible to regulate the excitation force of the vibration motor in stages. 　　When the vibration motor is powered on and rotates, it drives the eccentric masses at both ends of the motor shaft, generating an inertial excitation force. This force is a rotational force in three dimensions, with an amplitude of Fm. Fm = mrω², where m is the mass of the eccentric mass, r is the distance from the center of mass of the eccentric mass to the axis of rotation, that is, the eccentricity, and ω is the angular frequency of rotation of the motor; ω = 2πn/60, with n being the vibration frequency of the motor. The inertial excitation force is transmitted to the vibrating machine through the bearings, feet, or flanges of the motor, and this force constitutes the excitation force generated by the vibrating machine.