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Low Voltage AC Motor

Why Choose Us

Quality Control
We have a complete set of advanced motor testing equipment and produce in strict accordance with the standards of ISO9001 international quality management system. We are committed to providing customers with high-performance, high-quality products and continuously improving the quality of our products in every detail.

Advanced Production Equipment
We have a full set of advanced production and quality control equipment like motor performance testing system, motor testing software, armature comprehensive test system, winding machine, stator comprehensive test system, automatic stator coil shaping machine, welding equipment ,hydraulic press machine ,lathe ,cutting machine.

Rich Experience
Ningbo Zhenhai Yuanyi M&E Manufacture Co., LTD(YME) was established in 2007 and has over 16 years of experience in the designing, R&D, manufacturing and marketing of motors.

Superb Team
We have a skilled team,advanced production equipment and modern test facilities , which can provide customers with professional technical support and customized services according to customer requirements.

What is Low Voltage AC Motor

Low Voltage AC Motor is a type of electric induction motor that boasts high energy efficiency and stable performance. Compared to high voltage motors, low voltage motors provide a safer, easier, reliable and more cost-efficient energy option for industries. With features including low noise, low cost, less maintenance, heat resistance, our motors are widely used in electric vehicles,forklift,medical devices,agriculture, automation and high-tech fields.

Advantages of Low Voltage AC Motor

Durable
AC electric motors are extremely durable because unlike most DC motors, they do not have brushes. Brushes can become worn down easily and creates the need for more regular maintenance. As AC motors do not have this problem, this means they usually have a long lifespan and are preferred by those looking for an extremely durable solution.

Low power required for start-up
With low power required for start-up, this means AC motors can distribute their power more evenly and can maintain a consistent level of power throughout their operation. It also decreases the chance of burn out, which can occur when a motor becomes overworked at start-up.

Controlled acceleration
Controlled acceleration within AC motors means they allow for steady and controlled movement, which is key for many demanding applications across the globe. It also reduces wear and tear as speeds are not increasing and decreasing abruptly, therefore placing less pressure on the motor. Controlled acceleration is particularly important for an application such as caravan movers, where speed must remain stable and constant to ensure it performs as it should.

High speed
AC motors are known for being able to cope with and deliver high speeds, making them suitable for a range of demanding industry applications.

How Does an Low Voltage AC Motor Work

AC motors or alternating current motors are electric motors that convert electrical power into mechanical power in the form of an alternating voltage.
Unlike BLDC motors (also called EC motors), there are AC motors with or without permanent magnets. The stator of an AC motor essentially consists of a package of individual electrically insulated panels, which are surrounded by the stator winding.
A phase shift brings about the electromagnetic field of rotation.
The rotor generates its own magnetic field through the windings arranged in it or, depending on the design, permanent magnets contained in the rotor; this magnetic field counteracts the stator’s field of rotation.
The electromagnetic interaction between the stator's field of rotation and the rotor field generates a torque that sets the rotor in motion.

Considerations for Specifying Low Voltage Ac Induction Motors Versus Other Motor Technologies

AC induction motors are relatively easy to control. A simple volts/hertz algorithm can be tuned to control AC induction motors, although more sophisticated control algorithms can be used too.

AC induction motors are inherently asynchronous and fold back as needed for load or temperature increases.

AC induction is mechanically simpler than brushed DC or brushless AC motors. This simplicity typically results in high reliability and lower motor cost compared to a brushed DC or IPM motor solution.

Motors of the same KW rating can be designed economically so that peak efficiency and power density of AC induction motors are typically higher than brushed DC motors but lower than brushless PMAC/IPM motors.

AC induction motors are very forgiving to sudden loads. They do not stall easily. If there is a sudden load impulse, an AC induction motor will slip more for that impulse and current draw goes up.

AC induction motors supply reactive current to magnetize themselves, so power factor is generally lower than brushless PMAC / IPM motors.

AC induction motors do not contain rare earth materials or magnets that can be demagnetized due to excessive magnetic fields (due to excessive motor current) or extreme temperatures, and thus also do not have cogging or ripple torque challenges.

Because an AC induction motor induces the magnetic field in the rotor from the stator, when the AC motor is mechanically turned without power being applied, no back EMF or voltage is produced in the field windings, so no risk exists for damage to the control in this condition.

Classification of Low Voltage AC Motor

• Induction motors: Induction motors are known to be AC (alternating current) electric motors. The electrical power in the rotor is needed to create torque which is accomplished through the induction of an electromagnet (Oliveira & Ukil, 2019). It is from the revolving field of a magnet of the stator winding.

• Synchronous motors: It states that the AC motor is in the stable state of the shaft rotation in sync with the applied current's frequency. It does not rely on induced power to continue the operation (Stępniewski, 2018). Multiphase AC electromagnets are there on the stator which creates a revolving field of a magnet.

• Single-phase motors: The induction motor of a single phase is demonstrated as an AC motor that alters the electrical energy into mechanical energy for some physical tasks.
The motor of single-phase induction needs only the single phase of current for significant operations. It is utilised in the low application of power for industrial and domestic purposes.

• Three-phase motors: It is demonstrated as the kind of electric motor that helps in transforming the energy from electrical to mechanical by interactions of an electromagnet. It is also known as the motor of self-starting induction. It does not need any additional starting devices.

Low Voltage AC Motor Construction

Stator
The stator in the ac motor is an inactive part and the main function of this is to transmit a rotary magnetic field for interacting through the rotor.

Stator core
The stator core in the motor is designed with laminations or thin metal sheets which are mainly used to decrease energy loss.

Stator windings
Stator windings in the motor will load together to form a hollow cylinder. The stator core coils slots for the insulated wires are protected. Once the ac motor which is assembled is in process, the connection of stator windings can be done toward a power source. Every coils group with the steel core will turn into an electromagnet once the current supply is provided.

Rotor
The rotating part in the motor is the rotor and it is an essential part that is connected to the shaft. In an AC motor, the most common type of rotor used is the squirrel cage rotor. It is a cylindrical shape that is made through stacking slight steel laminations.

Shaft

The rotor assembly can be formed by pressing onto a steel shaft which expands outside of the motor casing to let the connection to an outside system broadcast the rotating power.

Bearings

Bearings are placed on the shaft of the motor to give support to the rotor & allow rotating. Some types of motors utilize a fan by placing it on the shaft of the rotor to cool down the motor once the shaft is revolving.
In the ac motor, bearings are used to hold the shaft within the place. Here, bearings will reduce the friction of the shaft that is connected toward the casing so that motor efficiency can be enhanced.

Enclosure

The enclosure in the motor includes a yoke or frame & two end brackets. The stator is located within the frame and the rotor is arranged within the stator through a small air gap that separates it from the stator. There is no straight physical link between the rotor & the stator.

How to Select an Low Voltage AC Motor?

Some factors should be considered while choosing an AC motor:

• We have to know the requirements of power; the ac motor should not run across their load as it could be injured

• We have to give a suitable cooling mechanism as the motor could produce a lot of heat

• To avoid breakdowns, we have to offer a dry & clean area for the ac motor

• The motor parts could exhaust, so we should change it by checking the parts

• There is a chance to enter the dirt into the motor while supplying the cooling we should be careful for this, and then we should block the air gap & the cooling ducts. Checking of insulation should be done once in a while to avoid the damage of insulation by applying low test voltage. Need to verify the bearings & rotors of the ac motor to give lubrication toward the motor’s bearing.

• Based on the starting torque, the motor should be selected

• We should consider the starting torque

• Efficiency & pull out torque is a significant factor

• Power factor must be considered

Low Voltage AC Motor Speed Control

The applications of AC motors involve mostly in industrial areas wherever these motors are required to control heavy-duty machines. In power plants wherever timeliness & accuracy are very essential for the operation, then AC motors have to be controlled. So, a variety of techniques may be used for controlling ac motor frequency & speed.

There are several techniques to control the AC motor speed like altering the number of poles within extremely small increments, altering the motor’s slip & altering the AC signal’s frequency.

From the above techniques, altering the poles is not used regularly as it is not efficient for frequent control.

Another technique like altering the rotor slip of the motor is mostly used once the AC motor is designed mainly for high slip. So by using this technique, this motor should be equivalent to the electric load. So when the power is changed then load speed will be changed. In addition, this load must include extensive inertial components.

The most frequently used technique for controlling the speed of an AC motor is altering the frequency of the motor. By using this technique, AC motor drives with variable speed are utilized to change the motor speed which is known as VFD (variable frequency drives), ASD (adjustable speed drives), or AC inverters.

A six-step inverter, PWN, or vector flux is used to adjust the AC frequency. A variable voltage inverter or six-step inverter mainly changes the power from AC to DC & after that, it switches to reproduce a sine wave. By using the PWM technique, DC voltage is changed quickly to equivalent “area under the curve.”

By considering these AC motor speed control techniques, we can operate a power plant where AC motors are utilized to power fans, pumps, etc. These applications need preciseness to maintain an operation running efficiently. The simple technique is to install consistent AC drives which are mainly designed to control the motor speed precisely.

These methods are available with different control settings so that one can simply discover speed controls to meet the requirements of your application. The main benefits of ac motor speed controls are the operating of machines can be controlled smoothly, acceleration control, production rates can be adjusted, savings of energy, etc.

Our Factory

Ningbo Zhenhai Yuanyi M&E Manufacture Co., LTD(YME) was established in 2007 and has over 16 years of experience in the designing, R&D, manufacturing and marketing of motors. We are committed to ongoing development and improvements. With the rapid development of the company's business, we successfully relocated to our brand new address with size over 14,000 SQM in 2022, marking an exciting milestone in our history.
Ningbo Zhenhai Yuanyi M&E Manufacture Co., LTD(YME) is a technology-based enterprise established in 2007. We focus on the R&D, manufacturing and marketing of motors, mainly producing a full range of small to medium size of AC & DC motors as well as customized motors and motor parts. We have a skilled team,advanced production equipment and modern test facilities , which can provide customers with professional technical support and customized services according to customer requirements. In order to ensure the performance and quality of our products, we have a complete set of advanced motor testing equipment and produce in strict accordance with the standards of ISO9001 international quality management system. We are committed to providing customers with high-performance, high-quality products and continuously improving the quality of our products in every detail. Excellent quality, quick response and personalized manufacture service could fully satisfy you.

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FAQ

Q: How to judge whether the low voltage AC motor needs to be replaced?

A: When the low voltage AC motor has a serious fault, performance degradation or cannot meet the use requirements, you should consider replacing a new motor. At the same time, factors such as motor upgrades and performance improvements should be considered when selecting.

Q: How to achieve energy saving during the operation of low voltage AC motors?

A: Energy saving operation of low voltage AC motors can be achieved by optimizing the operation mode of the motor, increasing the load rate of the motor, and adopting variable frequency speed regulation technology.

Q: How to detect the insulation performance of low voltage AC motors?

A: Insulation detection tools such as megohmmeters can be used to detect the insulation performance of low voltage AC motors. Before testing, the power supply should be disconnected and the motor should be in a safe state.

Q: What is the working principle of low voltage AC motors?

A: The working principle of low voltage AC motors is mainly based on the law of electromagnetic induction and the law of electromagnetic force. When the AC power supply is turned on, the current in the stator winding will generate a rotating magnetic field, which interacts with the conductor in the rotor to generate induced electromotive force and induced current, so that the rotor starts to rotate.

Q: What are the main performance parameters of low voltage AC motors?

A: The main performance parameters of low voltage AC motors include speed, power, voltage, current, efficiency, power factor, etc.

Q: How to maintain low voltage AC motors?

A: Regularly maintain low voltage motors, such as cleaning, lubrication, and checking the wiring of the motor. At the same time, the insulation performance of the motor should be checked regularly, and the insulation material should be replaced in time if there is a problem.

Q: What is a low voltage AC motor?

A: Low voltage AC motors refer to AC motors with a rated voltage below 1000V, which are widely used in various mechanical equipment.

Q: What are the main categories of low voltage AC motors?

A: Low voltage AC motors are mainly divided into two categories: asynchronous motors and synchronous motors. Asynchronous motors have a simple structure, reliable operation, and a wide range of applications; synchronous motors are suitable for precision control occasions.

Q: What are the main differences between asynchronous motors and synchronous motors?

A: The speed of asynchronous motors is related to the power supply frequency, which is usually lower than the synchronous speed; while synchronous motors run strictly synchronously with the power supply frequency, and the speed remains constant.

Q: How to select low voltage AC motors according to load type?

A: A suitable low voltage motor should be selected according to the load type (such as constant torque load, variable torque load, constant power load, etc.).

Q: How to choose a low voltage AC motor according to the working system?

A: The appropriate low voltage motor should be selected according to the working system (such as continuous working system, intermittent working system, periodic working system, etc.).

Q: What is the rated voltage of a low voltage AC motor?

A: The rated voltage of a low voltage AC motor is usually 380V and 220V. 380V is suitable for large mechanical equipment and 220V is suitable for small mechanical equipment.

Q: In which fields are low voltage AC motors widely used?

A: Low voltage AC motors are widely used in home appliances, industry, agriculture, construction, medical and other fields, such as driving motors in washing machines, refrigerators, air conditioners, conveyor belts, robotic arms and other equipment.

Q: What precautions should be taken when installing low voltage AC motors?

A: It should be installed in a dry, well ventilated environment without corrosive gases and dust. Avoid excessive stretching and twisting of the cable during installation, and ensure that the insulation performance of the motor is good.

Q: What are the common faults of low voltage AC motors?

A: Common faults of low voltage AC motors include bearing overheating, insulation degradation, winding damage, etc.

Q: How to deal with the bearing overheating problem of low voltage AC motors?

A: Bearing overheating may be caused by dirty lubricating oil or wrong brand. Check and replace the appropriate lubricating oil to ensure good bearing lubrication.

Q: How to choose an energy saving low voltage AC motor?

A: You should choose a low voltage AC motor model with high efficiency and energy saving characteristics, such as the YE2 series, YX3 series, etc. At the same time, when selecting the model, you should reasonably select the power and speed of the motor according to actual needs.

Q: What is the main difference between low voltage AC motors and high voltage AC motors?

A: In addition to the different rated voltages, low voltage AC motors also differ from high voltage AC motors in terms of power, current, insulation requirements, etc. High voltage motors usually require the use of high voltage switchgear and integrated protectors to match them, which is more expensive; while low voltage motors are relatively simple and economical.

Q: What are the starting methods of low voltage AC motors?

A: The starting methods of low voltage AC motors include direct starting, series reactance starting, variable frequency starting, and other methods. The appropriate starting method should be selected according to factors such as the motor capacity, load characteristics, and grid conditions.

Q: How long is the service life of a low voltage AC motor?

A: The service life of a low voltage AC motor is affected by many factors, such as the quality of the motor, the mode of operation, and maintenance. Generally speaking, under normal use and good maintenance, the service life of a low voltage AC motor can reach several years or even longer.

Ningbo Zhenhai Yuanyi M&E Manufacture Co., Ltd. is one of the most professional low voltage ac motor manufacturers and suppliers in China, featured by quality products and good service. Please rest assured to buy customized low voltage ac motor at low price from our factory.

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