DC Motor
What is DC Motor?
A direct current (DC) motor is a type of electric machine that converts electrical energy into mechanical energy. DC motors take electrical power through direct current, and convert this energy into mechanical rotation. DC motors use magnetic fields that occur from the electrical currents generated, which powers the movement of a rotor fixed within the output shaft. The output torque and speed depends upon both the electrical input and the design of the motor.
Why Choose Us?
Rich Experience
Sunroad Motor has been specializing in the development and production of DC motors for over three decades. As a professional manufacturer of DC motors, it is also an authoritative micro-motor engineering technology center certified by relevant institutions.
Professional Team
The company has established a comprehensive team of 160 professionals dedicated to production, research and development, and management. Equipped with advanced facilities, the team is capable of independently designing and developing products tailored to customer requirements.
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All our products undergo rigorous quality control processes and have received official certifications, including ISO9001 system certification, CE certification, and UL certification. Additionally, we hold numerous patents that reflect our commitment to innovation and excellence.
Broad Market
Our products are exported to Europe, America, and major cities across China. We maintain long-term, stable partnerships with leading customers in the industry on a global scale, ensuring consistent satisfaction and trust.
Top 7 Advantages of DC Motor
DC motor got higher Starting Torque is the best advantages of dc motor.
due to this higher starting torque these DC motors are widely used for applications such as electrical traction. It s also use to deal with heavy load under starting conditions such as electrical cranes and locomotives. There are several types of DC motors available in electrical industry . For these kind of higher starting torque applications DC series motors are widely use.
Ability to control speed over wide range.
Unlike other type of electrical motors, DC motors got the capability to speed control the above and the bellow range of rated speed. So this can control the speed over wider range. For this type of speed controlling purposes DC Shunt electrical motors are widely use.
No Harmonic effect.
If we consider about the induction motors , one of the main disadvantage is the effect of harmonic in the motor and this is a loss also. Since DC motors does not generate any harmonics this motor can eliminate the harmonic problem of the motor.
Ability to Quickly Control the Motors.
If we consider about other motors it's quite difficult to control fast and accurately. DC motors solves this problem and for applications where need immediate start, reverse and stopping we can use this DC motors for better performances.
Dc motor are best for low-cost operation.
Compare to with inverter duty induction motors and drives, DC motors proves effective performance with less const and maintenance.
Less electronics and Rectification Needs.
Compare with AC inverter drive motor this DC motor required less electronic and rectification on power electronic based circuit. and this motor can also directly fed from different types of power source.
Better Speed regulation.
DC motors are much popular due to its better speed regulations compare with ac motors. For higher specific speed controlling required its better to use DC motor for precise uses.
Hope that you have get some good understanding about the advantages of DC motor over ac motors. We are plan to discuss more regarding other important article about DC motors in future.
How a DC motor actually works
A Direct Current (DC) motor is a motor that turns energy from a direct current and turns this into mechanical energy. The first DC motor was developed around the 1830’s-1840s. They were commercially unsuccessful, because these motors were battry powered and batteries were still very expensive and the quality was low. When the electrical grid was created and the rechargeable batteries were invented in the late 1800s this all changed. The first commercially viable DC motors entered the market. DC motors have been improved continiously, but other types of motors, like the BLDC motor, have been developed in the mean time too. As a result, the use of brushed Direct Current motors in several applications is limeted today.
The rotor is normally located on the inside of the motor, while the stator is located on the outside. The rotor contains coil windings that are powered by the DC current and the stator contains either permanent magnets or electromagnetic windings. When the motor is powered by DC current, a magnetic field is created within the stator, attracting and repelling the magnets on the rotor. This causes the rotor to start rotating. To keep the rotor rotating, the motor has a commutator. When the rotor aligns with the magnetic field, it would stop spinning, but in this case the commutator would reverse the current through the stator and this way reverse the magnetic field. This way the rotor can keep spinning.
Types of DC Motors
A DC motor is a motor that turns energy from a direct current and turns this into mechanical energy. There are 3 main types of DC motor that are available: Series, Shunt and Compound. These terms relate to the type of connection of the field windings with respect to the armature circuit. The post takes a look at these three types of DC motor and explains their unique properties and where they might be used.
A DC series motor will have its field windings connected in series with the armature. The series winding will have relatively few turns of larger wire or copper strip which are capable of carrying the full load current of the motor. On starting, because the windings are low resistance, a large current can be drawn producing a high starting torque.
This is an advantage for high starting loads such as traction, crane and other heavy applications. The speed of a series motor is dependent on the load, so when the full load current flowing through the circuit has reduced, the speed will have increased.
In some instances, the motors speed could potentially increase to a level above the recommended maximum. For this reason, a series motor should not be connected to its load with a belt.
In a DC Shunt motor the field winding is connected in parallel (shunt) with the armature. The shunt winding is wound from many turns of small copper wire and since it is connected across the DC field supply, its field current will be constant.
The motor will run up to rated speed and this will not be greatly affected by a change in load. The starting torque will be less than a similar sized series motor but if this is not required then a constant speed shunt motor may be preferable for the application.
DC shunt motors can be used for many applications such as plastics or wire extrusion. We carry a stock of small DC shunt wound motors in IP23 IC06 format (drip proof force ventilated). Other DC motors can be made on request.
With a DC compound motor, the majority of the field is wound for a shunt field but with a few turns of series winding on top. The shunt is connected across the field supply and the series turns are connected in series with the armature. This provides a motor with a combination of the shunt and series characteristics.
The starting torque will be higher than a shunt motor but not as high as a series motor. The speed will change with load and the amount will depend on the % of field space allocated to the series winding. The series field can be arranged to either increase or decrease the speed with load. Applications for these motors vary but are often for larger applications such as unwind brake generators, conveyors, mixers etc.
A form of DC compound motor can also be used where the supply is from batteries with a wide range of volts. In this instance both the field and armature have the same voltage applied and by using the compound winding this helps to keep the speed within an acceptable range.
Difference Between AC and DC Motor
The difference between AC and DC motors is extremely important not only from the examination point of view, but also for various projects and practical demonstrations. By knowing the AC and DC motor differences, choosing the right one for a particular demonstration becomes easy. For engineering aspirants also, this topic holds extreme importance. Before knowing the difference between DC and AC motors, it is important to know the in-depth details about an electric motor. By knowing the details of an electric motor, one can easily understand the differences and relate the points comfortably.
| Sl. No. | Differentiating Property | AC Motor | DC Motor |
| 1 | Definition | An AC motor can be defined as an electric motor that is driven by an alternating current (AC). | A DC motor is also a rotatory electric motor that converts Direct current (DC energy) into mechanical energy. |
| 2 | Types | AC motors are mainly of two types – synchronous AC motors and induction motors. | DC motors are also mainly of two types – DC motors with brushes and DC motors without brushes. |
| 3 | Current Input | AC motors only run when an alternating current is given as input. | DC motors will only run when a DC supply is given. In the case of an DC series motor, the motor might run with an AC supply. But, for shunt motors, the motor never runs on an AC supply. |
| 4 | Commutators and Brushes | Commutators and brushes are absent in AC motors. | Commutators and carbon brushes are present in the DC motors. |
| 5 | Input Supply Phases | AC motors can run on both single-phase and three-phase supplies. | DC motors can run only on single-phase supply. |
| 6 | Starting of Motor | A three-phase AC motor is self-starting, but a single-phase AC motor requires a starting mechanism. | DC motors are always self-starting in nature. |
| 7 | Armature Characteristics | In AC motors, the armature is stationary while the magnetic field rotates. | In DC motors, the armature rotates while the magnetic field remains stationary. |
| 8 | Input Terminals | In AC motors, three input terminals (RYB) are present. | In DC motors, two input terminals (positive and negative) are present. |
| 9 | Speed Control | The speed of an AC motor can be changed by varying the frequency. | In the case of DC motors, speed can be controlled by changing the armature winding current. |
| 10 | Load Change | AC motors show a slow response to the change in load. | DC motors show a quick response to the change in load. |
| 11 | Life Expectancy | Since AC motors do not have brushes and commutators, they are very rigged and have a high life expectancy. | The brushes and commutators in DC motors limit the speed and reduce the life expectancy of the motor. |
| 12 | Efficiency | Due to induction current loss and motor slip, the efficiency of the AC motor is less. | The efficiency of the DC motor is high as there is no slip and induction current loss. |
| 13 | Maintenance | AC motors require less maintenance as brushes and commutators are absent. | DC motors require excessive maintenance due to the presence of brushes and commutators. |
| 14 | Applications | AC motors are required where there is a need for high speed and variable torque. | DC motors are required where there is a need for variable speed and high torque. |
| 15 | Practical Uses | They are mainly used in large industries. | They are mostly used in small domestic appliances. |
These were the main differences between AC and DC motors. Both AC and DC motors are used extensively in various appliances. Knowing the detailed AC and DC motors differences can help an individual to choose either of them according to the requirements.
DC Motor Parts
Dc motor components consist of a stator, armature, rotor and commutator with a brush. The opposite polarity between the two magnetic fields inside the DC motor that causes the rotation.
To make it easier to understand the components and functions, here we explain the DC motor parts complete with pictures and functions:
• Rotor (Armature)
The rotor is one of the parts of a DC motor which is also often called an armature. The component rotates and is between the poles of the fields windings. Some of the particles that make up the rotor include the core, commutator, shaft, and rotor windings.
The rotors on the DC motor are magnetic laminated cylinders isolated from each other. The position of this rotor is perpendicular to the axis of the cylinder. It is this rotor that will rotate rotating on its axis and separated from the field coil by an air gap.
• Stator (Coil Field)
The stator is one part of the motor, but it does not move, but is stationary. The constituent particles consist of several components, including the core, winding, and stator frame. On the frame part it is made using cast iron, as well as being home to the entire element of the generator. This one component is a DC motor part in the form of a wire winding that will produce a magnetic field. This part is a static/ immovable part.
• Engine Body
The components of the machine body have a function as a medium for the flow of magnetic flux produced by the two magnetic poles. In addition, the machine body also has the function of laying certain tools that surround part of the machine. Generally, the body of this machine is made of steel plate material or cast iron.
• Commutator (Komutator)
A commutator is a cylindrical structure made of copper stacked but insulated to each other using mica. The main function of the commutator is to supply electric current to the winding of the coil.
• Brush ( Sikat Motor DC)
The carbon brush is located on the commutator and is useful for providing an electrical voltage supply to the motor. The motor mechanically can cause certain problems in an environment. It takes some maintenance when wearing the motor. The action of the carbon brush or the presence of movement on the commutator can cause a spark. These brush components are made of graphite and carbon structure. The brush on the DC motor plays a role in conducting electric current from the outer circuit to the rotating commutator.
• Belitan Armor
This component is often also known as Armature winding, which is part of a DC motor whose role is to generate a static magnetic field in the rotor. Therefore, we understand that commutators and brush units relate to the transmission of power from a static electrical circuit to a mechanically rotating region or rotor.
• Frame (Yoke)
This dc motor part is a protector (protector) of the stator and rotor. The frame or yoke protects all the components in it.
How to Choose DC Motor?
There are a few things to consider when it comes to the DC motor selection process. We all know that electric DC motors convert electrical energy into mechanical energy, but there are a lot of options on the market to choose from. The DC motor selection process can be a daunting process: we are here to help get you focused and headed in the right direction with our 4 DC motor Selection Tips.
1. Determine Your Speed, Torque and Voltage First
The three main specifications you will need to know for any DC motor application are voltage, speed and torque. Once these aspects are determined, you are now ready to get started on your journey to select the ideal DC motor solution. The key is to use a DC motor that is operating at or near its maximum efficiency.
DC motor voltage should also be defined at the start of the DC motor selection process. DC motor voltage will be determined by your electrical power source, for example a 12-Volt battery or power supply.The nominal voltage for DC motors is typically either 12 or 24VDC.
2. Balance Size vs. Performance
Proper DC motor size is important for every application but it can become an issue if a certain performance is required. Typically, larger DC motors are more powerful than their smaller counterparts. Depending on your application requirements, you may have to sacrifice certain performance characteristics to help accommodate the size constraints.
By utilizing different types of DC motors and DC motor technologies, like brushless DC motors or DC motors with permanent magnets, there are endless possibilities to help meet the size constraints for the majority of applications.
3. Gear DC motors Offer More Torque
Sometimes you need more torque than is physically possible to get out of a standard DC motor. Utilizing a DC gear DC motor will result in increased torque and reduced speed, which is all dependent on the gear ratio that is used. There are 3 basic types of gear DC motors: spur gear DC motors, planetary gear DC motors, and worm gear DC motors. Each gearhead type has its own distinct advantages.
You can add a gearhead to stepper DC motors, brushless DC motors, as well as brushed DC motors. To learn more about the distinct differences between the different gear DC motor types, check out our design note: Planetary Gear DC motors Vs. Spur Gear DC motors.
4. Define your Duty Cycle
Your duty cycle will dictate which DC motor type is best for your application or device. Operating times and dwell times, as well as directional rotation, are key aspects of your duty cycle. The duty cycle should be defined at the beginning of the DC motor selection process.
Intermittent duty cycles are encouraged for most industrial applications to help extend the useful life of a DC motor or gear DC motor. Continuous use is still acceptable but you need to make sure the DC motor is operating at its peak efficiency.
Our Factory
Zhejiang Sanrong Electric Motor Co., Ltd. was established in 1986 and has been deeply involved in DC motors for more than 30 years. It is a professional manufacturer of DC motors and an authoritative certified micro motor engineering technology center. In order to meet the needs of customers and the market, the company invested 20 million yuan in 2000 to establish a modern factory in Ningbo with an area of 22000 square meters. We have established a production, research and development, and management team of 160 people. Our mature research and development team and professional testing and research and development equipment enable us to independently design and develop products according to customer needs. Professional automation equipment greatly improves our production capacity to meet the order needs of domestic and foreign customers.
Ultimate FAQ Guide to DC Motor
Q: What is slip in a motor?
Q: How to supply power to the rotor?
Q: What are the three types of losses in a DC motor?
• Mechanical loss: This loss refers to the friction which is caused due to brush and bearings and due to other rotating parts.
• Iron loss: This loss occurs due to eddy current and hysteresis.
• Copper loss: This loss mainly occurs in the armature and in the field windings.
Q: Why is AC current better than DC?
Q: What is a DC motor?
Q: What is difference between AC and DC motor?
Q: How does DC Motor work?
Q: How is a DC motor wound?
Q: Can DC motors spin both ways?
Q: Are brushless motors AC or DC?
There are two types of commonly used DC motors: Brushed motors, and brushless motors (or BLDC motors). As their names imply, DC brushed motors have brushes, which are used to commutate the motor to cause it to spin. Brushless motors replace the mechanical commutation function with electronic control.
Q: What is the difference between a brushless motor and a DC motor?
Q: What is the difference between long shunt and short shunt DC motor?
Q: What is the most common type of DC motor?
Q: Why is DC used in motor?
Q: What are the benefits of DC motors?
Fantastic speed control: DC motors are known for their great speed control, offering great precision and safety that trains require. Broad speed variation can be achieved by changing the armature or field voltage.
Q: Why choose Parvalux for a DC motor?
Q: Why use a DC motor instead of AC?
Q: What appliances uses DC motor?
Q: Are DC motors stronger than AC motors?
Q: Do I need an AC or DC motor?
Zhejiang Sanrong Electric Motor Co., Ltd. is one of the most professional dc motor manufacturers and suppliers in China, providing high quality customized service with reasonable price. We warmly welcome you to buy dc motor for sale here and get quotation from our factory.
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