2023年7月17日星期一

Which factors affect motor performance changes?

             What's the factor affect 

               DC motor   

       performance change


The Main factors that affecting micro DC motor performance changes


What's the factor affect motor performance change

The performance of a motor is determined by three major factors: 

  1. voltage between terminals
  2. resistance between terminals
  3. magnetic force.

Here, we will provide specific examples to illustrate the various main factors that have an impact on these main factors, namely the deterioration of DC motor performance.

Voltage for  DC motor performance changes:

Only when there is a change in the voltage of the power supply can the performance be directly proportional to the change in voltage.

As shown in the image, when the voltage changes due to the power supply, the rotating line moves in Parallel transport, and the current line almost changes in a straight line. 

However, beyond a certain limit, it is no longer proportional to the voltage.

What's the factor affect DC motor performance change














Power type for DC motor perfomance change:

Comparing a Constant power supply with an attached resistance power supply (a power supply with internal resistance r), 

the attached resistance power supply will experience a voltage drop with the internal resistance r.

The stopping current will initially decrease, and the stopping torque will also decrease, causing a change in the inclination of the rotating line.

What's the factor affect DC motor performance change

Internal resistance of manganese battery (1.5V)

Unit 1 type

0.15~0.20 (Ω)

Unit 2 type

0.25~0.35 (Ω)

Unit 3 type

0.40~0.50 (Ω)


Remarks:A motor can be defined by a generator that generates a voltage proportional to the number of revolutions, as well as a motor terminal resistance in series with the voltage.

Coil for  motor perfomance change:

What has a significant impact on motor performance is the coil size.


When there is a change in the number of coils and the diameter of the coil, the results are different.

If the number of coils is increased, the no-load speed of the motor will decrease proportionally.

What's the factor affect DC motor performance change

If the diameter of the coil is thickened, the stopping torque and stopping current of the motor increase proportionally to the square of the coil diameter. 

However, beyond a certain limit, it is no longer proportional to the square.

What's the factor affect DC motor performance change

Conditions for changing the winding line with the same model


When changing the winding line with a motor of the same model, it is necessary to use similar line product values.


Line product value= φ 2 (twice the diameter of the coil wire) × N (number of coils)


Temperature for  motor perfomance change:

The ambient temperature can affect the magnetic force and coil resistance of the magnet. Therefore, there will also be changes in motor performance.


What's the factor affect DC motor performance change

The degree of change at every 1 ℃ change

 

The magnetic force of a magnet

ferrites

-0.19%


Rare earth magnet

-0.13%

Coil resistance

+0.39%

Additional explanation: The impact on the 4-point performance of the motor when the temperature increases


N0: No load RPM


In inverse proportion to the weakening of the magnetic force of the magnet, N0 increases.


I0: No load current


It is inversely proportional to the magnetic force of the magnet, but the loss caused by changes in the viscosity of the bearing oil has a greater impact on I0. 

Therefore, our company assumes that I0 is not affected by temperature changes when making presumptive calculations.


Is: stopping current


Inversely proportional to the coil resistance, if the temperature rises, Is will decrease.


Ts: Stopping torque


Due to the weakening of the magnetic force of the magnet, the current will decrease. Therefore, if the temperature rises, Ts will significantly decrease.


List of Main Factors for Returning to Changes


Types of magnets for motor performance change


There are also various types of magnets, mainly referring to changes in magnetic force.


Because when changing from a wet heterojunction magnet to a dry heterojunction magnet, the magnetic force will weaken,

 causing a decrease in the stopping torque (Ts) and an increase in the number of unloaded rotations (N0).

What's the factor affect DC motor performance change

case for for motor performance change

In terms of the ability of magnets, when the metal shell that maintains the magnetic force is thin, 

the magnetic force will leak out of the shell. The so-called auxiliary casing refers to preventing magnetic leakage in order to ensure the ability of the magnet.


The value of a will vary depending on the leakage degree of the motor's magnetic force or the thickness of the auxiliary casing. 

The difference in the auxiliary casing in our company is approximately 8-12%, and it is considered as a=1.08-1.12.

What's the factor affect DC motor performance change

Phase for for motor performance change



Phase refers to the position relationship between the conversion position of the commutator and the brush and the center position of each magnetic pole of the magnet.


Even if the motor is assembled into a neutral phase in the early stages, during load operation, due to the phenomenon of rotor reaction,

 it will become delayed phase (delayed angle) electrically for a period of time. Delayed angle is a poor condition for motors, 

which will lead to deterioration in efficiency, electrical noise, lifespan, and other aspects. 

As an improvement measure, the phase angle is assembled into an inlet angle, 

which counteracts the rotor reaction during load rotation to maintain a neutral inlet angle motor electrically.




Set the neutral 4-point performance to (N0, I0, Is, Ts), and the performance of the inlet angle to (N0 ', I0', Is', Ts'). 

The performance of the inlet angle will be as shown in the above figure, with a slight increase in no-load speed N0 ', 

while other performance is generally similar. When the variation of N0 'is 12-15 °, the angle of entry is 6-8%.


However, when calculating Ts based on the intermediate torque performance, the angle of entry may become relatively small.


What's the factor affect DC motor performance change


Points to note about the angle motor


If the angle motor is reversed in this state, it will become a delayed angle, leading to deterioration of the rectification effect, 

and adverse factors in terms of electrical noise and lifespan. Therefore, the direction of rotation must be unidirectional.


More information of DC motor,pls refer to:

DC motor overview


2023年7月6日星期四

spring contact 6mm vibration motor Z0610-TP

 6mm vibration motor Z0610-TP



                                          Spring vibration motor Z0610-TP

Spring contact,easy for assemble.


Vibration motor Z0610-TP drawing:

glucose meter motor,vibration motor


vibration motor Z0610-TP widely used for:

Medical equipment: intelligent kit, Sphygmomanometer, Glucose meter


Electric beauty products: beauty pens, electric facial cleaners, facial massagers, eye protectors

Electric toys: Model aircraft, Quadcopter, aircraft model, UAV

Vibrators: contact lens cleaning machines, electronic equipment vibrations, sex products, mobile phones and fields such as steering gear, precision instruments, robots, etc.


Vibrating Glocose meter motor characteristics:


  • rated voltage:1.5V;
  • no load current:7mA;
  • no load speed:8500r/min;
  • stall current:0.046A;
  • stall torque:0.64gf.cm

Accepting and providing customized micro dc motor consulting, design, and manufacturing services, we can offer suitable and high-quality DC micro motors for you.


Confidence comes from quality, and service highlights value. Dedicated to serving you!



2023年6月27日星期二

which vibration motor have the longest lifetime?

 


Life for phone motor


Usually,we use BLDC motor,coin motor ,smt motor and LRA motor for smart phone.

 

And follow is the lifetime for these motors:

Under the condition  On 1sec/Off 1sec .

 

The life for as follows show:

 

BLDC Motor

Coin Motor

SMT Motor

LRA  Motor

2000,000 cycles

100,000 cycles

200,000 cycles

 

1,000,000 cycles



We can find that BLDC motor can have more than 1000 hours for life time.

This is very nice for urability.

And BLDC motor is widely used in new model.

LRA motor is also very nice. 

 

When the motor used in smart phone.

The service life of mobile phone vibration motors is influenced by various factors, including temperature, humidity, voltage, load, etc. 

If these factors cannot be effectively controlled, the service life of the vibration motor will be affected and even damaged in advance.

Therefore, in order to extend the service life of the vibration motor on  phones, we should take the following measures:


1. Control environmental temperature and humidity: Temperature and humidity are important factors that affect the service life of the vibration motor. Therefore, we should try to maintain the environmental temperature and humidity within the normal range to ensure the normal use of the vibration motor. 

 

2. Control voltage: If the voltage is too high or too low, it will affect the service life of the vibration motor. Therefore, it is necessary to try to keep the voltage within the normal range to ensure the normal use of the vibration motor.


3. Load control: Excessive load can cause overheating of the vibration motor, thereby shortening its service life. Therefore, it is necessary to control the load as much as possible to ensure the normal use of the vibration motor. 

 

4. Regular inspection: The working status of the vibration motor should be regularly checked, and problems should be identified and dealt with in a timely manner to ensure the normal use of the vibration motor. In short, in order to extend the service life of the vibration motor on Apple phones, effective measures must be taken to control environmental temperature and humidity, control voltage, control load, and conduct regular inspections to ensure the normal use of the vibration motor.

2023年6月13日星期二

Coreless BLDC motor B1718

Coreless Brushless DC Motor B1718 




Coreless Brushless DC Motor B1718 

brushless coreless

diameter 17mm length 18mm 

High torque

low current 

low heat generation


Advantage for 1718 BLDC motor:


  • Radial rotation/circumferential rotation (flat)
  • Low noise and low power consumption
  • Strong seismic sensation with simple structure
  • Strong reliability and short response time
  • Small inertia and sensitive start




Characteristics  for B1718 BLDC motor:

voltageno load current(shaft 1.5mm) out power max  no load speed resistance stall torquefriction torque
3V0.095A1.9W14000RPM1.07OHM5.37mNm0.18mNm
6V0.049A1.92W14000RPM4.3OHM5.34mNm0.18mNm
12V0.027A1.4W14000RPM17.1OHM5.38mNm0.18mNm
24V0.018A1.93W14000RPM68.8OHM5.36mNm0.17mNm

Drawing for B1718 BLDC motor:




Application for BLDC motor:


drone,medical device.smart lock,electric tool,electric toothbrush..


Color:silver,black and colorful is customized.






2023年6月2日星期五

What's the differ between X-axis and Z -axis linear motor

 

What's the differ between X-axis and Z -axis linear motor

There are the following differences between X-axis linear motors and Z-axis linear motors in mobile phones:

Different directions: X-axis linear motors and Z-axis linear motors move in different directions. The X-axis linear motor can move in the horizontal direction, while the Z-axis linear motor can move in the vertical direction.

Different functions: Due to different directions, the functions of the X-axis linear motor and the Z-axis linear motor are also different.

The X-axis linear motor is mainly used to provide vibration feedback in the horizontal direction. It can generate corresponding vibrations when users slide the screen, operate games, or touch buttons, enhancing the user's tactile experience. For example, when playing games, the X-axis linear motor can simulate different tactile feedback, such as strikes, impacts, or vibrations, making users more immersive. In addition, when sliding the interface, the X-axis linear motor can provide a physical sense of sliding through weak vibration feedback, increasing the interactivity of the interface.

The Z-axis linear motor is mainly used to provide vertical vibration feedback. It can generate a sense of vibration when notified of an arrival, when a button is pressed, or when a specific event is triggered. For example, when receiving messages or incoming calls, the Z-axis linear motor can alert users through vibration, allowing them to sense important notifications even without looking at the screen. In addition, the Z-axis linear motor can also provide the physical touch of buttons when touching them, enhancing the user's button experience.

Different sizes: Due to different directions and functional requirements, the sizes of X-axis linear motors and Z-axis linear motors also differ. Typically, X-axis linear motors may have smaller dimensions, while Z-axis motors may require larger dimensions to provide sufficient force and accuracy.

In summary, there are significant differences in direction, function, and size between X-axis linear motors and Z-axis linear motors, so they are typically used in different application scenarios.

Which type of linear motor is better depends on the specific usage scenario and requirements. The X-axis linear motor and Z-axis linear motor have functional differences, but both can provide a good tactile feedback experience. The choice of which linear motor is better depends on the user's personal preferences for tactile feedback and specific usage scenarios. The following are the characteristics and applicable scenarios of X-axis linear motors and Z-axis linear motors:

  1. X-axis linear motor: The installation position of the X-axis linear motor in the mobile phone is on the left and right sides, mainly used to provide horizontal tactile feedback. The following are the characteristics and application scenarios of X-axis linear motors:

(1) Game experience: X-axis linear motors can simulate tactile feedback in games, such as hitting, hitting, or vibrating sensations, enhancing the immersion and realism of the game.

(2) Sliding interface: When sliding the screen or browsing applications, the X-axis linear motor can provide weak vibration feedback, increasing the interactivity and tactile experience of the interface.

(3) Operation feedback: When the user operates the physical or touch buttons of the phone, the X-axis linear motor can provide tactile feedback, allowing the user to perceive the actual tactile operation of the buttons.

  1. Z-axis linear motor: The Z-axis linear motor is installed on both sides of the phone, mainly used to provide vertical tactile feedback. The following are the characteristics and application scenarios of Z-axis linear motors:

(1) Notification reminder: Z-axis linear motors can alert users to receive new messages, incoming calls, or other important notifications through vibration, even without looking at the screen.

(2) Physical button simulation: When touching virtual buttons or areas on the screen, the Z-axis linear motor can provide tactile feedback of physical buttons, allowing users to have a more realistic button experience.

(3) Vibration feedback: Z-axis linear motors can generate vibration feedback in specific application scenarios or trigger specific events, such as explosive effects or emphasis prompts in games.

In summary, both X-axis linear motors and Z-axis linear motors have their own advantages and usage scenarios in providing tactile feedback. Choosing which linear motor is better depends on the user's personal preferences and specific usage needs. If you focus more on the gaming experience, interactive sliding interface, and operational feedback, then the X-axis linear motor may be more suitable for you. If you value notification reminders, physical button simulation, and vibration feedback more, then the Z-axis linear motor may be more in line with your needs. However, in terms of the current level of use on the market, the X-axis linear motor is more widely used.