Product Description
Product Description
- Product Info
Neodymium (NdFeB) permanent magnet is composed of neodymium, iron, boron and a few transition metals. It has many advantages like high coercive force, high energy, high performance/ cost ratio and can be easily formed into various shapes and widely used in many fields such as aviation, electronics, instruments, meters, DC motors, Liner motors, MRI, medical and health products. It is the third generation of rare earth permanent magnet and at the same time the most powerful and advanced commercialized permanent magnet today.
| Product name: | N52 Half Round Circle Trapezoid N52 Neodymium arc Magnet Wind Turbine |
| Shape: | Disc,Ring,Block,Cylinder,Ball,Bar,Arc,Irregular etc |
| Direction of magnetisation: | Through the thickness or through the diameter |
| Type of coating: | Nickle, Ni-Cu-Ni, Zn, Gold, Silver,Epoxy, Parylene |
| Grade: | N35-N52; N35M-N50M; N35H-N48H; N35SH-N45SH;N30UH-N40UH; N30EH-N38EH |
| Tolerance in size: | +/-0.05mm |
Grade:
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Grade |
Br |
Hcb |
Hcj |
(BH)max |
Working Temp |
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mT |
Gs |
kA/m |
Oe |
kA/m |
Oe |
kJ/m3 |
MGOe |
ºC |
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N35 |
1180-1230 |
118,China |
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Certification: |
ISO9001:2016, SGS,Rohs. |
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Main products |
Neodymium/NdFeB magnets |
SmCo magnets |
Alnico magnets |
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Micro magnets |
FeCrCo magnets |
Magnetic assembly |
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Market: |
95% parts are sold to USA, Germany, Italy, UK, Japan, Korea, Israel, Thailand, Indonesia, Have a good reputation. |
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Our advantage: |
1. Professional factory to supply suitable high quality products. 2. More than 10 years experiences for magnets. We can supply technical support. 3. Reasonable prices and quickly delivery time. |
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Package&Shipment
FAQ
*1
Q) Are you a Magnet factory or trading company?
A) We are 1 of the leading magnet manufactures in HangZhou, welcome to visit our factory.
*2
Q) Does the magnet quality guarenteed?
A) Yes, we can guarentee the magnets we ship to you is of 100% with good quality as you order, if there is any product quality problem or products broken during shipping, we will bear 100% responsibility for you, you can ask for for related refund or replacement.
*3
Q) How long does it take for production and shipping duration?
A) For regular magnet orders, it would take 7-10working days or so, for customized items, it would take 25-35working days or so. Besides, the fastest production time is 3working days for the urgent orders.
*4
Q) How does the magnet grade and magnet dimensions(L x W x H) affects the CHINAMFG Level of magnets?
A) Same magnet size, higher grade with higher gauss;
Same magnet grade, same surface area, the thicker, the higher gauss;
Same magnet grade, same thickness, larger surface area with lower gauss;
*5
Q) What does pulling force mean?
A) Pulling force is a measure of magnetic strength. It is the amount of force required to remove a magnet parallel to a CHINAMFG magnetic surface, such as a steel plate.
*6
Q) If I stick 2 neodymium magnets together, does their strength double?
A) No. It will a little smaller. For example, 2 magnets rated with a individual pulling force of 50 lbs will have a combined pulling force of 90 lbs when stick together.
*7
Q) Do neodymium magnets lose strength over time?
A) They do not naturally lose any strength and will keep the strength permanently in the normal conditions, unless meet the high temperature over 80 degrees Celsius(ºC), and then will lose the strength gradually.
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| Application: | Electronic Products, Speaker Magnet, Industrial Magnet, Jewelry Magnet, Solenoid, Motor Magnet |
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| Shape: | Arc |
| Coating: | Nickel |
| Samples: |
US$ 5/Piece
1 Piece(Min.Order) | Order Sample |
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| Customization: |
Available
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.shipping-cost-tm .tm-status-off{background: none;padding:0;color: #1470cc}
| Shipping Cost:
Estimated freight per unit. |
about shipping cost and estimated delivery time. |
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| Payment Method: |
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Initial Payment Full Payment |
| Currency: | US$ |
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| Return&refunds: | You can apply for a refund up to 30 days after receipt of the products. |
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How does the speed control of a DC motor work, and what methods are commonly employed?
The speed control of a DC (Direct Current) motor is essential for achieving precise control over its rotational speed. Various methods can be employed to regulate the speed of a DC motor, depending on the specific application requirements. Here’s a detailed explanation of how speed control of a DC motor works and the commonly employed methods:
1. Voltage Control:
One of the simplest methods to control the speed of a DC motor is by varying the applied voltage. By adjusting the voltage supplied to the motor, the electromotive force (EMF) induced in the armature windings can be controlled. According to the principle of electromagnetic induction, the speed of the motor is inversely proportional to the applied voltage. Therefore, reducing the voltage decreases the speed, while increasing the voltage increases the speed. This method is commonly used in applications where a simple and inexpensive speed control mechanism is required.
2. Armature Resistance Control:
Another method to control the speed of a DC motor is by varying the armature resistance. By inserting an external resistance in series with the armature windings, the total resistance in the circuit increases. This increase in resistance reduces the armature current, thereby reducing the motor’s speed. Conversely, reducing the resistance increases the armature current and the motor’s speed. However, this method results in significant power loss and reduced motor efficiency due to the dissipation of excess energy as heat in the external resistance.
3. Field Flux Control:
Speed control can also be achieved by controlling the magnetic field strength of the motor’s stator. By altering the field flux, the interaction between the armature current and the magnetic field changes, affecting the motor’s speed. This method can be accomplished by adjusting the field current through the field windings using a field rheostat or by employing a separate power supply for the field windings. By increasing or decreasing the field flux, the speed of the motor can be adjusted accordingly. This method offers good speed regulation and efficiency but requires additional control circuitry.
4. Pulse Width Modulation (PWM):
Pulse Width Modulation is a widely used technique for speed control in DC motors. It involves rapidly switching the applied voltage on and off at a high frequency. The duty cycle, which represents the percentage of time the voltage is on, is varied to control the effective voltage applied to the motor. By adjusting the duty cycle, the average voltage across the motor is modified, thereby controlling its speed. PWM provides precise speed control, high efficiency, and low power dissipation. It is commonly employed in applications such as robotics, industrial automation, and electric vehicles.
5. Closed-Loop Control:
In closed-loop control systems, feedback from the motor’s speed or other relevant parameters is used to regulate the speed. Sensors such as encoders or tachometers measure the motor’s actual speed, which is compared to the desired speed. The difference, known as the error signal, is fed into a control algorithm that adjusts the motor’s input voltage or other control parameters to minimize the error and maintain the desired speed. Closed-loop control provides excellent speed regulation and accuracy, making it suitable for applications that require precise speed control, such as robotics and CNC machines.
These methods of speed control provide flexibility and adaptability to various applications, allowing DC motors to be effectively utilized in a wide range of industries and systems.
Can DC motors be used in renewable energy systems, such as wind turbines or solar tracking systems?
Yes, DC (Direct Current) motors can be effectively used in various renewable energy systems, including wind turbines and solar tracking systems. The unique characteristics and advantages of DC motors make them well-suited for these applications. Here’s a detailed explanation of how DC motors can be utilized in renewable energy systems:
1. Wind Turbines:
DC motors can be employed in wind turbines to convert the mechanical energy of the wind into electrical energy. There are two common configurations:
a. Direct Drive Wind Turbines:
In direct drive wind turbines, the rotor of the turbine is directly connected to a DC generator. The rotor’s rotational motion is transmitted directly to the generator, which produces DC electrical power. DC motors can be used as DC generators in this configuration. The advantage of using DC motors/generators is their simplicity, reliability, and ability to operate efficiently at variable speeds, which is beneficial in varying wind conditions.
b. Hybrid Wind Turbines:
Hybrid wind turbines combine both aerodynamic and electrical conversion systems. In this configuration, DC motors can be utilized for the pitch control mechanism and yaw control system. The pitch control mechanism adjusts the angle of the turbine blades to optimize performance, while the yaw control system enables the turbine to align itself with the wind direction. DC motors provide precise control and responsiveness required for these functions.
2. Solar Tracking Systems:
DC motors are commonly employed in solar tracking systems to maximize the efficiency of solar panels by optimizing their orientation towards the sun. There are two main types of solar tracking systems:
a. Single-Axis Solar Tracking Systems:
Single-axis solar tracking systems adjust the inclination of solar panels along a single axis (typically the east-west axis) to track the movement of the sun throughout the day. DC motors can be used to drive the rotation mechanism that adjusts the panel’s tilt angle. By continuously adjusting the panel’s position to face the sun directly, the solar energy harvested can be significantly increased, resulting in higher energy output compared to fixed solar panel installations.
b. Dual-Axis Solar Tracking Systems:
Dual-axis solar tracking systems adjust the inclination of solar panels along both the east-west and north-south axes to track the sun’s movement throughout the day and throughout the year. DC motors are utilized in the rotation mechanisms for both axes. This type of solar tracking system provides the highest possible energy yield by keeping the solar panels perpendicular to the sun’s rays at all times, maximizing the exposure to sunlight.
DC motors are preferred in renewable energy systems due to their advantages, including:
- Efficiency at Variable Speeds: DC motors can operate efficiently at varying speeds, making them suitable for applications with fluctuating wind speeds or changing solar angles.
- Control and Precision: DC motors offer precise control and responsiveness, allowing for accurate tracking and adjustment in wind turbines and solar tracking systems.
- Reliability: DC motors are known for their reliability, with fewer moving parts compared to other motor types, reducing the risk of failure in remote or harsh environments.
- Compatibility with Energy Storage Systems: DC motors can easily be integrated with energy storage systems, such as batteries or supercapacitors, to store excess electrical energy generated by wind turbines or solar panels.
In conclusion, DC motors can be effectively utilized in renewable energy systems such as wind turbines and solar tracking systems. Their efficiency, control capabilities, reliability, and compatibility with energy storage systems make them a suitable choice for these applications, contributing to the advancement of sustainable energy generation.
Where can individuals find reliable resources for learning more about DC motors and their applications?
Individuals seeking reliable resources to learn more about DC (Direct Current) motors and their applications can explore various sources that provide comprehensive and accurate information. Here’s a detailed explanation of where individuals can find reliable resources for learning about DC motors:
1. Manufacturer Websites:
Many DC motor manufacturers have dedicated sections on their websites that provide detailed information about their products, including specifications, application notes, technical guides, and whitepapers. These resources offer valuable insights into the design, operation, and application considerations of DC motors. Examples of reputable DC motor manufacturers include Baldor, Maxon Motor, and Faulhaber.
2. Industry Associations and Organizations:
Industry associations and organizations related to electrical engineering, automation, and motor technology can be excellent sources of reliable information. Examples include the Institute of Electrical and Electronics Engineers (IEEE) and the American Society of Mechanical Engineers (ASME). These associations often provide access to technical publications, research papers, conferences, and educational resources related to DC motors and their applications.
3. Technical Books and Publications:
Technical books and publications authored by experts in the field of electrical engineering and motor technology can provide in-depth knowledge about DC motors. Books such as “Electric Motors and Drives: Fundamentals, Types, and Applications” by Austin Hughes and “Practical Electric Motor Handbook” by Irving Gottlieb are widely regarded as reliable resources for learning about DC motors and their applications.
4. Online Educational Platforms:
Online educational platforms offer a wealth of resources for learning about DC motors. Websites like Coursera, Udemy, and Khan Academy provide online courses, tutorials, and video lectures on electrical engineering, motor theory, and applications. These platforms often have courses specifically dedicated to DC motors, covering topics such as motor principles, control techniques, and practical applications.
5. Research Papers and Scientific Journals:
Research papers published in scientific journals and conference proceedings can provide detailed insights into the latest advancements and research findings related to DC motors. Platforms like IEEE Xplore, ScienceDirect, and Google Scholar can be used to search for scholarly articles on DC motors. These papers are authored by researchers and experts in the field and provide reliable and up-to-date information on various aspects of DC motor technology.
6. Online Forums and Communities:
Online forums and communities focused on electrical engineering, motor technology, and DIY projects can be valuable resources for learning about DC motors. Platforms like Reddit, Stack Exchange (Electrical Engineering section), and specialized motor forums provide opportunities to ask questions, engage in discussions, and learn from experienced individuals in the field. However, it’s important to verify information obtained from online forums as they may contain a mix of opinions and varying levels of expertise.
When accessing these resources, it’s essential to critically evaluate the information and cross-reference it with multiple sources to ensure accuracy and reliability. By utilizing a combination of manufacturer websites, industry associations, technical books, online educational platforms, research papers, and online communities, individuals can gain a comprehensive understanding of DC motors and their applications.
editor by CX 2024-05-10