The Secret of JTF Sonic Toothbrush

by 彭叶敏 on Jun 09, 2022

The Secret of JTF Sonic Toothbrush

Brushing teeth is something that most people do every day, and abandoning ordinary toothbrushes to choose electric toothbrushes is mostly aimed at saving effort and time. Better and more effective cleaning of teeth should be the ultimate goal.

Electric toothbrush selection unavoidable three keywords: frequency, amplitude, and torque

Frequency, this is well understood. The faster the frequency of the toothbrush brush head swings, the more times the toothbrush brush head cleans the teeth in the same time period, and the cleaning efficiency will be greatly improved. The current mainstream electric toothbrush vibrates from 15,000 to 31,000 times per minute, while the JTF P200 electric toothbrush with the highest frequency can reach 42,000 times per minute, which is 350Hz per second (twice at 1Hz, 1 minute 60 seconds).

Amplitude, vibration frequency is only one of the key points for an electric toothbrush to clean teeth efficiently, and amplitude is another key point. Different brands of electric toothbrush brush head vibration amplitude is usually between 3mm to 5mm. The height of the normal adult crown (that is, the part of the tooth that is exposed beyond the gums) is between 7mm and 11mm, and the maximum of the upper and lower jaw crowns will not exceed 20mm. Based on this data, the brush head of an electric toothbrush is generally about 10mm wide, and with a vibration amplitude of about 5mm, the vibration amplitude of the vibrating bristles during work will not exceed the length of the teeth, so that the teeth can be brushed without hurting the gums. 

Torque, in fact, the amplitude and torque mentioned above are closely related. Brushing your teeth requires force on your wrist. Needless to say, the same is true for electric toothbrushes. When we brush our teeth with an electric toothbrush, we have to force the brush head to the teeth, and this force will affect the amplitude of the electric toothbrush, making many electric toothbrushes useless on your teeth.

The appropriate force for brushing teeth is 200g. When this force is applied to the teeth through the electric toothbrush, the electric toothbrush with large torque can overcome this external force and maintain its own effective amplitude, while the amplitude of the electric toothbrush with insufficient torque will be greatly attenuated. even to 0 amplitude. At this time, you will still feel the electric toothbrush vibrating, but in fact, the brush handle is vibrating, and the brush head basically does not move, and this brushing is in vain.

When choosing an electric toothbrush in the future, don’t just look at the frequency, torque is also very important. The three keywords all point to the core of the electric toothbrush, the motor.

Readers who have read the above content should already know that frequency, amplitude, and torque determine the basic quality of electric toothbrushes, and these three aspects are indispensable. And what determines the performance of these three aspects is only the core of the electric toothbrush - the motor (mover).

There are many electric toothbrushes on the market, and the motors they use are nothing more than the following: mechanical torsion oscillating motors, brushed rotating motors, brushed reciprocating vibration motors, and brushless reciprocating vibration motors.

The most well-known Philips electric toothbrush uses a mechanical torsion vibration motor, while Oral B uses a brushed rotary motor to drive the gear to achieve the reciprocating rotation of the reciprocating bristles. The newly released JTF P200 uses the latest brushless reciprocating vibration motor.

The above-mentioned JTF Sonic Toothbrush with 42,000 vibrations per minute and torque uses a linear programmable brushless sonic motor. The rotor is driven to reciprocate by the change of the electromagnetic field on the stator, and the rotor is a pure suspension structure in the magnetic field, which has no mechanical friction and no additional noise, so it can achieve high frequency, large torque, and low attenuation. The brush motor can realize digital frequency conversion control, and the swing can be adjusted by software.