Sonic Vibrating Toothbrushes

Sonic Vibrating Toothbrushes

Electric toothbrush classification and main components:DC motor

Electric toothbrushes are mainly divided into two categories, rotary and vibration (usually called sonic). See the image upstair.

Rotary type

Rotating the circular brush head through the motor in the main body of the toothbrush turns the traditional manual brushing into electric and enhances the friction effect, thereby improving the efficiency of brushing.

However, there are many disadvantages to rotating electric toothbrushes.

The noise is louder.

Although the tooth cleaning is very clean, the cleaning of the teeth is relatively weak.

The tooth enamel layer is very worn.

Therefore, it is not recommended for long-term use.

The motor of this type of toothbrush has little difference. It is a small DC motor. The difference is mainly related to the motor power.

                         round small dc motor                                                                                                                                             flat small dc motor

Vibration motor type(sound wave) 

  waterproof toothbrush motor

The vibration frequency of the bristles/brush heads is the same or similar to the frequency of the sound waves, so it is also called a sonic vibration toothbrush.

Have you seen an ultrasonic cleaner? Have you seen ultrasonic cleaning glasses? The principle is the same:

The high-frequency oscillating brush head can effectively complete the action of washing teeth. The vibration of more than 30,000 times per minute can make a large amount of tiny bubbles in the mixture of toothpaste and water. The pressure generated when the bubble bursts can penetrate the teeth to reach the depth. Cleaning effect

Vibrating toothbrushes are divided into two categories: eccentric vibration and linear vibration according to the type of motor.

Eccentric motor (low, mid-range)

The vibration principle of the motor is that an eccentric wheel is added in front of the rotary motor. During the rotation of the motor, during the process, the eccentric wheel moves circumferentially to generate centrifugal force, and the direction of the centrifugal force changes continuously with the rotation of the cam. As a result, the entire motor is rapidly shaking, which eventually causes the toothbrush to vibrate. (As shown below)

                       vibration motor vibrate principle

Linear motor (medium and high grade)

This kind of motor has a good name in the industry: magnetic suspension motor

Principle: There are two sets of electrodes, the vibrator (the connecting rod of the brush head) is between the two sets of electrodes. By changing the control signal, an alternating current is generated, and the direction and intensity of the magnetic field are changed, so that the vibrator swings at high speed between the plates. The main advantage:

Since the vibration link is suspended in the middle, it is also called a magnetic levitation motor. The physical friction is reduced, and the vibrating component has only the connecting rod, the vibration of the body is small, the noise is very small, and the palm is not numb due to the vibration of the body.

The direction of vibration is only a single linear direction of +X –X, so it is also called linear motor.

Since the vibration connecting rod is controlled, and the energy of the entire vibrating portion is concentrated on the brush head portion, the brushing effect is optimized.

The disadvantage is that the cost is high.

Figure Linear motor internal structure and style

a) Linear motor noise

The details determine the success or failure, noise is the main direction of many high-quality products, such as the world's most famous headset brands BOSE, Sennheiser, SONY, beats, now the main focus is noise reduction. Domestic, tata wooden door, the slogan is "only quiet, you can hear yourself"; Hisense air-conditioning, slogan is "spoil your ears." Because I am sensitive to noise, I can't tolerate too much noise for a long time. So when designing our own products, reducing noise is the most important personal appeal, followed by long standby.

The noise of linear motors is generally small, but the noise is also related to the structural design.

Many people don't pay much attention to noise. But for example, because the state has a standard for air conditioning noise. According to national standards, when the cooling capacity is less than 2500W, the rated noise of the indoor unit cannot be greater than 40 decibels, and the outdoor unit cannot be greater than 52 decibels; when the cooling capacity is 2500W~4500W, the rated noise of the indoor unit cannot be greater than 45 decibels, and the outdoor unit cannot be larger than 55 decibels. This is the minimum standard that air conditioning products must meet.

Therefore, for long-term use, noise is also a key factor in evaluating the quality of toothbrushes.

The figure below is to test the noise contrast in the same environment. It is the first gear (the strongest gear).

From net edicated by www.vibrationmotor.net