Product Description

 

10B Series  φ10mm x L15   Precious Metal Brushes  

Motor Paramter Motor Model
Values at nominal voltage 10B1NA-
040121
       
  1 Rated voltage V 7.4        
Free Load 2 No load speed rpm 60462        
3 No load current mA 112        
At Max. Efficiency 4 Max. efficiency % 67.42%        
5 Speed rpm 51254        
6 Current mA 6223        
7 Torque g.cm 5.9        
At Max. Output 8 Max. output W 6.01        
9 Speed rpm 35711        
10 Current mA 1788        
11 Torque g.cm 19.38        
At Stall 12 Stall current A 3.45        
13 Stall torque g.cm 38.76        
Motor Constants
  14 Teminal resistance Ω 1.75        
  15 Torque constant g.cm/A 11.562        
  16 Speed  constant rpm/V 8443        
  17 Speed/Torque constant rpm/g.cm 1559.7        

Motor Characteristic Typical Performance
Thermal parameters  

18 Ambient temperature -20~+65 ºC
19 Max. permissible winding temperature                                 85 ºC
Mechanical parameters
20 Max. penmissible No-load speed 50000 rpm
21 Max. axial load(dynamic) 0.15 N
Other parameters
22 Number of pole pairs 1  
23 Number of commutator segments 3~5  
24 Weight 5.8 g
Remarks  
1 Rotation direction, wire specification and performance parameters can be
made according to customer’s requirement.
2 Motor can be mounted with various shapes and sizes of eccentric weight which
is made of iron, brass or ferro-alloy to become vibration motor.
3 Dimension with “*” in the drawing can be adjusted according to customer’s requirement.
       1g=0.035oz    1inch=25.4mm    1g.cm=0.098mN.m     1oz=28.35g     1mm=0. 0571 inch     1mN.m=10.2g.cm

Company & Factory

 

 

 
     
     

Appliance
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Application: Automation Equipment, Moving Machinery
Operating Speed: High Speed
Power Source: DC Motor
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dc motor

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.

dc motor

What is the significance of back EMF (electromotive force) in DC motor performance?

The significance of back EMF (electromotive force) in DC motor performance is crucial to understanding the behavior and operation of DC motors. Back EMF is an inherent characteristic of DC motors and plays a pivotal role in their efficiency, speed regulation, and overall performance. Here’s a detailed explanation of the significance of back EMF in DC motor performance:

When a DC motor operates, it generates a voltage known as back EMF or counter electromotive force. This voltage opposes the applied voltage and is caused by the rotation of the motor’s armature within the magnetic field. The back EMF is directly proportional to the rotational speed of the motor.

The significance of back EMF can be understood through the following aspects:

1. Speed Regulation:

Back EMF is crucial for regulating the speed of a DC motor. As the motor rotates faster, the back EMF increases, which reduces the effective voltage across the motor’s armature. Consequently, the armature current decreases, limiting the motor’s speed. This self-regulating characteristic helps maintain a relatively constant speed under varying load conditions. It allows the motor to deliver the required torque while preventing excessive speed that can potentially damage the motor or the driven equipment.

2. Efficiency:

Back EMF plays a significant role in the efficiency of a DC motor. When the motor is loaded and drawing current, the power supplied to the motor is the product of the armature current and the applied voltage. However, the electrical power converted into mechanical power is reduced by the power consumed by the back EMF. The back EMF represents the energy returned to the power supply as the motor generates its own voltage. By reducing the effective voltage across the motor, it helps minimize power losses due to electrical resistance and improves the overall efficiency of the motor.

3. Motor Protection:

The presence of back EMF also provides a level of protection to the motor. When a DC motor is operating and the load on the motor suddenly decreases, such as when the driven equipment is disconnected, the motor’s speed can increase rapidly. This increase in speed leads to a higher back EMF, which reduces the armature current and prevents excessive current flow. By limiting the current, the back EMF helps protect the motor from overloading and potential damage.

4. Voltage Regulation:

Back EMF affects the voltage regulation in a DC motor. When the motor is operating, the back EMF opposes the applied voltage. As the motor load increases, the voltage drop across the armature resistance and other internal losses also increase. The back EMF helps compensate for these voltage drops, ensuring that the motor receives an adequate voltage to maintain its performance and torque output.

5. Control and Dynamic Response:

Back EMF provides valuable information for motor control and dynamic response. By measuring the back EMF voltage, the rotational speed of the motor can be estimated, allowing for precise speed control and feedback. This information is crucial for applications that require accurate speed regulation, such as robotics or industrial automation.

In summary, the significance of back EMF in DC motor performance cannot be overstated. It influences speed regulation, efficiency, motor protection, voltage regulation, and control capabilities. By understanding and utilizing the inherent characteristics of back EMF, engineers can design and optimize DC motor systems for various applications, ensuring reliable and efficient operation.

dc motor

How does the size and power rating of a DC motor affect its suitability for different tasks?

The size and power rating of a DC (Direct Current) motor play crucial roles in determining its suitability for different tasks and applications. The size and power rating directly impact the motor’s performance characteristics, including its torque output, speed range, efficiency, and overall capabilities. Here’s a detailed explanation of how the size and power rating of a DC motor affect its suitability for different tasks:

Size of DC Motor:

The size of a DC motor refers to its physical dimensions, including its diameter, length, and overall volume. The size of the motor influences its ability to fit into specific spaces or applications with space constraints. Here are some key considerations regarding the size of a DC motor:

1. Space Limitations: In applications where space is limited, such as small robotic systems or compact machinery, smaller-sized DC motors are preferred. These motors provide a more convenient and efficient integration into the overall system design.

2. Weight Constraints: Certain applications, such as drones or lightweight robots, may have strict weight limitations. Smaller-sized DC motors are generally lighter, making them more suitable for weight-sensitive tasks where minimizing the overall system weight is essential.

3. Cooling and Heat Dissipation: The size of a DC motor can impact its ability to dissipate heat generated during operation. Smaller-sized motors may have less surface area for heat dissipation, which can lead to increased operating temperatures. In contrast, larger-sized motors typically have better heat dissipation capabilities, allowing for sustained operation under heavy loads or in high-temperature environments.

Power Rating of DC Motor:

The power rating of a DC motor refers to the maximum power it can deliver or the power it consumes during operation. The power rating determines the motor’s capacity to perform work and influences its performance characteristics. Here are some key considerations regarding the power rating of a DC motor:

1. Torque Output: The power rating of a DC motor is directly related to its torque output. Higher power-rated motors generally provide higher torque, allowing them to handle more demanding tasks or applications that require greater force or load capacity. For example, heavy-duty industrial machinery or electric vehicles often require DC motors with higher power ratings to generate sufficient torque for their intended tasks.

2. Speed Range: The power rating of a DC motor affects its speed range capabilities. Motors with higher power ratings can typically achieve higher speeds, making them suitable for applications that require rapid or high-speed operation. On the other hand, lower power-rated motors may have limited speed ranges, making them more suitable for applications that require slower or controlled movements.

3. Efficiency: The power rating of a DC motor can impact its efficiency. Higher power-rated motors tend to have better efficiency, meaning they can convert a larger proportion of electrical input power into mechanical output power. Increased efficiency is desirable in applications where energy efficiency or battery life is a critical factor, such as electric vehicles or portable devices.

4. Overload Capability: The power rating of a DC motor determines its ability to handle overloads or sudden changes in load conditions. Motors with higher power ratings generally have a greater overload capacity, allowing them to handle temporary load spikes without stalling or overheating. This characteristic is crucial in applications where intermittent or varying loads are common.

Overall, the size and power rating of a DC motor are important factors in determining its suitability for different tasks. Smaller-sized motors are advantageous in space-constrained or weight-sensitive applications, while larger-sized motors offer better heat dissipation and can handle heavier loads. Higher power-rated motors provide greater torque, speed range, efficiency, and overload capability, making them suitable for more demanding tasks. It is crucial to carefully consider the specific requirements of the application and choose a DC motor size and power rating that aligns with those requirements to ensure optimal performance and reliability.

China Hot selling High Speed 60000rpm Small Electric Vibrator DC Brush Coreless Motor   a/c vacuum pump		China Hot selling High Speed 60000rpm Small Electric Vibrator DC Brush Coreless Motor   a/c vacuum pump
editor by CX 2024-05-10