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HomeNewsHow to choose an electric toothbrush motor?

How to choose an electric toothbrush motor?

2020-08-08
Brushing teeth is something that most people do every day, and abandoning ordinary toothbrushes and choosing electric toothbrushes, most of the purposes are not only saving effort and saving time, but better and more effective cleaning of teeth should be the ultimate goal.

As the name suggests, an electric toothbrush is a toothbrush driven by electricity. The built-in drive brush head uses high-frequency oscillations from tens of thousands to tens of thousands of times per minute (some electric toothbrushes use gears to mechanically convert vibrations) to clean the teeth.

Electric toothbrushes choose three unavoidable keywords: frequency, amplitude, and torque.

Amplitude, vibration frequency is just one of the key points for an electric toothbrush to efficiently clean teeth, and amplitude is another key point. The vibration amplitude of the head of the electric toothbrush of different brands is usually between 3mm and 5mm. The height of a normal adult's crown (that is, the part of the tooth exposed outside the gums) is between 7mm and 11mm, and the total height 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 in width, plus a vibration amplitude of about 5mm. The vibration amplitude of the bristles that vibrate 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 hard wrists. Needless to say, the same is true for electric toothbrushes. When we brush our teeth with an electric toothbrush, we have to press the brush head against the teeth forcefully, and this force will affect the amplitude of the electric toothbrush, making many electric toothbrushes useless work on your teeth.

Frequency, this is well understood. The faster the toothbrush head swings, the more times the toothbrush head will clean the teeth in the same time, and the cleaning efficiency will be greatly improved. The current mainstream electric toothbrushes vary from 15,000 to 31,000 vibrations per minute, and the most frequent electric toothbrush can reach 42,000 vibrations per minute, which is 350 Hz per second (1 Hz vibration twice, 1 minute 60 seconds).

The appropriate force for brushing teeth is 200g. When this force is applied to the teeth through an electric toothbrush, an electric toothbrush with a large torque can overcome this external force and maintain its effective amplitude, while an electric toothbrush with insufficient torque will greatly attenuate the amplitude. Even to zero amplitude. At this time, you will still feel the electric toothbrush vibrating, but in fact the handle is vibrating, and the brush head is basically not moving, this time brushing is wasted.

The torque of common electric toothbrushes is between 150gf.cm and 230gf.cm.

When choosing an electric toothbrush in the future, don't just look at the frequency, the 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 have already understood that frequency, amplitude, and torque determine the basic qualities of an electric toothbrush. These three aspects are indispensable, and only the core of the electric toothbrush-the motor (moving child).

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 mechanical torsion oscillating motor of the electric toothbrush has an eccentric structure for the transmission shaft and is limited by a spring sheet or a mechanical baffle. The frequency is not high, generally not more than 31,000 times per minute. And although the no-load torque is high, the load torque drops significantly. The vibration amplitude is limited by the mechanical structure, the noise is also large, and the service life is relatively low.

The performance of the brushless reciprocating vibration motor is much better, its frequency can be higher, and the torque will increase accordingly, and the amplitude can be adjusted through software.

But the difference between a Brush Motor and a brushless reciprocating vibration motor is quite big. The main difference between them is whether they are equipped with commonly used brushes and commutators.

The commutation of the Brushed Dc Motor is achieved by contacting the brushes with the annular commutator mounted on the rotor, while the Brushless DC Motor uses the Hall sensor to feed back the rotor position to the control circuit, so that it can know the motor The exact time of phase commutation.

Because the commutator and the rotor are fixed together, and the brush and the housing (stator) are fixed together, when the motor rotates, the brush and the commutator continue to rub against and generate resistance and heat. Therefore, the brushed motor has mechanical friction and power loss, the service life depends on the brush, and the frequency is not too high. Therefore, it is used in large electrical equipment such as hair dryers, factory motors, and household range hoods. Many low-end electric toothbrushes also use brush motors. In addition, the speed of the brushed motor can also reach high, but due to the wear of the carbon brush, the service life is not as good as the Brushless Motor.

The Brushless motor is different because there is no carbon brush, so the friction is low and the loss is low. Brushless motors are usually controlled by digital frequency conversion with strong controllability. It can be easily realized from a few revolutions per minute to tens of thousands of revolutions per minute. The service life is on the order of tens of thousands of hours. This kind of motor is used in equipment with relatively high control requirements and relatively high speed, such as aircraft models, precision instruments, high-end electric toothbrushes, etc., which have strict control of motor speed and high speed.

Of course, when choosing an electric toothbrush, the motor is very important, but the brush head, circuit control, and even the body coating material can affect your daily use. Therefore, when purchasing an electric toothbrush, there are many considerations.

Shenzhen Maintex Intelligent Control Co., Ltd.
Business Type:Manufacturer
Product Range:DC Motor , AC Motor , Stepper Motor
Products/Service:Stepper Motor , Brushless motor , Dc motor , treadmill used motor , Brushed Dc Motor , Fuji motor
Certificate:ISO14001 , ISO/TS16949 , ISO9001 , RoHS
Company Address:Zhengde Science Park, No. 8, Pingdi Street, Longgang District, Shenzhen, Guangdong, China

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