Zhejiang Hertz Electric Co.,Ltd., founded in 2014, is high-tech enterprise specializing in the development, manufacture, sales, and after-sales service, serving medium and high-end equipment manufacturers and industrial automation system integrators. Relying on high-quality production equipment and rigorous testing process, we will provide customers with products such as low-voltage and medium voltage inverters, soft starters and servo control systems and solutions in related industries. The company upholds to the concept of "providing users with the best products and services" to serve every costomer. At present, it is mainly used for metallurgy, chemical industry, paper making, machinery and other industries.
Why Choose Us
Professional team
Our team of experts has many years of experience in the industry, and we provide our customers with the necessary support and advice.
High-quality products
Our products are manufactured to the highest standards using only the best materials. We ensure that our products are reliable, safe and long-lasting.
24H online service
The 400 hotline is open 24 hours a day. Fax, email, QQ, and telephone are all-round and multi-channel to accept customer problems. Technical personnel are 24 hours a day to answer customer problems.
One-stop solution
Provide technical support in the whole process of inspection, installation, commissioning, acceptance, performance acceptance test, operation, maintenance and other corresponding technical guidance and technical training related to contract products in a timely manner.
Our Variable Frequency Drive (VFD), designed for precise motor control, is a versatile solution aimed at enhancing energy efficiency and operational performance.
The inverter drive enables precise control over motor speed, resulting in reduced energy consumption and lower operating costs, making it an environmentally friendly choice for businesses.
Frequency Drive For Three Phase Motor
High quality material and first-class technology. Powerful function, continuously variable transmission. Regular appearance, small and beautiful. Convenient operation and intuitive digital display.
This type of VFD is often used in residential and small commercial settings, as it is suited to motors that operate on 120V power and do not require high levels of power output.
We grant each single segment 220V and three segment 220V input. When used for single phase, every other segment can be used as a spare line.
The use of frequency conversion device, drag air conditioning system of refrigeration pump, cold water pump, fan is a very good power saving technology.
3.7KW Variable Frequency Drive. This is a 24V 150W brushless DC gear motor with a flange of 90x90mm. The built-in 10:1 keyway shaft right angle gearbox brings speed and torque to 300.
5.5KW Variable Frequency Drive. This is a 24V 150W brushless DC gear Motor with a flange of 90x90mm. The built-in 5:1 spur gearbox brings speed and torque to 600rpm and 1.95Nm(276.14.
Frequency converter is an AC strength machine that converts the electricity provide to different frequencies. In the late 1980s, China started out to use frequency converter.
What Is Variable Speed Drive For Single Phase Motor
Variable speed drives (VSDs) for single phase Motor are devices that regulate the rotation speed of an single phase electric motor. It works by manipulating the frequency and voltage of the output to the motor, thereby allowing the motor speed to be varied. These motors use the power that comes in a single, continuous waveform. This waveform is supplied from the electrical grid, which is typically 120V or 240V in most residential settings. They are ideal for appliances like refrigerators, washing machines, and power tools.
Benefits of Variable Speed Drive for Single Phase Motor
Energy savings: Variable speed drive for single phase motor can significantly reduce energy consumption by only providing the motor with the power that it needs at any given time. This can lead to annual energy savings of up to 50% or more in some cases.
Improved productivity: VSD for single phase motor can also improve productivity by allowing motors to run at the optimal speed for the task at hand. This can lead to faster cycle times and increased throughput.
Extended motor life: VSD for single phase motor can help to extend the life of motors by reducing the amount of stress that they are subjected to. This is because VSDs can smoothly start and stop motors, which helps to prevent motor burnout.
Improved safety: VSD for single phase motor can help to improve safety by reducing the risk of electrical shock and fire. This is because VSD for single phase motor help to prevent motors from overloading, which can lead to these hazards.
Improved process control: Variable speed drive for single phase motor can be used to precisely control the speed of motors, which can be beneficial for a variety of processes. For example, VSD for single phase motor can be used to control the temperature of a furnace by adjusting the speed of the fans that blow air through the furnace.
Increased flexibility: VSD for single phase motor can make motors more flexible by allowing them to operate at a wider range of speeds. This can be beneficial for applications where the load on the motor varies frequently. VSD for single phase motor can also help to reduce noise and vibration levels, which can improve the overall working environment.
A variable speed drive (VSD) for a single-phase motor works by controlling the frequency and voltage supplied to the motor, allowing it to adjust its speed. The VSD converts the incoming single-phase AC power into DC, then uses an inverter to recreate an AC output at the desired frequency. By changing the frequency of the AC power supplied to the motor, the drive controls the motor's speed while maintaining efficiency.
In addition to speed control, the VSD also offers soft starting and stopping features, reducing mechanical stress on the motor and connected equipment. This helps improve energy efficiency, reduces wear on the motor, and allows for precise control of motor speed in applications such as fans, pumps, and conveyors.
How to Use a Variable Speed Drive for a Single Phase Motor
Choosing the Right VSD: The first step in using a variable speed drive (VSD) with a single-phase motor is selecting the appropriate VSD. It's crucial to ensure the VSDs power and voltage ratings match those of the motor. For instance, if your single-phase motor operates at 220V and 1HP, your VSD should be capable of handling these specifications. Additionally, you should check the compatibility of the VSD with single-phase inputs as some VSDs are designed only for three-phase inputs. Always refer to the VSD's technical datasheet or consult with the supplier or manufacturer to confirm its suitability for your specific motor and application.
Setting Up the VSD: After choosing the right VSD, you need to wire it correctly to both the power source and the motor. It's generally recommended to follow the wiring diagram provided in the VSD's user manual, as incorrect wiring can lead to damage or even safety hazards. Typically, the VSD's input is connected to the power supply, and the output is connected to the motor. Remember to ensure all connections are secure and that the VSD is grounded correctly to avoid electrical faults.
Configuring the VSD: With the wiring completed, you'll need to set up the VSD's parameters according to your motor's requirements and the desired operation. This typically involves configuring settings like the motor's rated voltage, rated power, rated speed, and acceleration and deceleration times. By properly setting these parameters, you can ensure the VSD will control the motor's speed and torque accurately and efficiently. Some VSDs also offer advanced settings like energy-saving modes and automatic fault detection, which can be beneficial in some applications.
Operating the VSD: After the VSD has been configured, you can start operating it to control the single-phase motor. The VSD's control panel or digital interface allows you to adjust the motor's speed, switch the motor's running direction, and monitor various parameters like the current motor speed and power consumption. It's essential to keep an eye on these parameters to ensure the motor and VSD are operating within their rated capacities.
Maintenance: Regular maintenance is critical to ensure the longevity of the VSD and the motor. This can include periodic checks of the wiring and connections, monitoring the operating parameters to identify any signs of abnormal performance, and cleaning the VSD to prevent dust buildup, which could lead to overheating. Also, remember to inspect the motor for any signs of wear and tear or overheating. By maintaining both the VSD and the motor properly, you can ensure efficient operation and extend their service life.
Difference Between Three Phase VSD and Single Phase Motor VSD
The biggest difference between single phase VSD and three phase VSD is that power supply of single phase VSD is consisted of a live wire and a neutral wire with a voltage of 220V. There's only one live wire, so it's called single phase. Power supply of the three phase VSD has three live wires, so it's called three phase VFD, as well as three phase power input VSD.
In addition, output voltage of the single phase VSD can be divided into single phase output and three phase output. The three phase output here would not exceed the power supply voltage. If the single phase input is 220V, the three phase output would also be 220V, which is different from the output of three phase VSD. Correspondingly, connection modes of their motors are also different. If the connection doesn't match with the voltage, the motor has no power.
Single phase input means that there are only two lines for power supply input (one neutral line and one live line), the phase voltage of input voltage is 220V. Three phase input means that there are three input wires (three-phase three-wire) or four input wires (three-phase four-wire), generally, the three-phase four-wire is common. Three input live wires and one neutral wire, the phase voltage between each live wire and neutral wire is 220V, the phase voltage between every two live wires is 380V.
When the power is the same, the current of single phase power supply is equal to power/220V. Assuming that the power is 1000watt, then the current is 4.54A. The current on each live wire of three phase power supply is equal to one third of the total current, namely 4.54/3=1.5A, so it has a lower requirement to the wire, and thinner wires can be used. It shall be noticed that three phase power supply is generally available only in industrial applications, most households use only single phase power supply (one live wire, one neutral wire and one earth wire), VSD with three phase power supply can't be used. Single phase power supply VSD can be used in three-phase four-wire power supply areas (connect to one live wire and one neutral wire).
Application of Variable Speed Drive for Single Phase Motor
Household Appliances
Single phase motors, often powered by a VSD, are found in several home appliances such as refrigerators, air conditioners, fans, and washing machines. The VSD provides precise control over motor speed, optimizing performance and energy efficiency.
DIY and Professional Power Tools
Single phase motors, when paired with a VSD, offer variable speed control for tools such as drills and saws. This flexibility allows for greater precision and adaptability to different tasks.
Office Equipment
Office devices like printers and photocopiers often incorporate single phase motors controlled by VSDs. This allows for precise movement control, essential for high-quality printing and copying.
Agricultural
In the agriculture sector, single phase motors paired with VSDs often power irrigation pumps. By controlling the motor speed, VSDs can optimize water usage and energy efficiency.
Healthcare
Single phase motors, controlled by VSDs, are used in a variety of medical devices. From patient beds to various lab equipment, VSDs allow for precise speed control.
Automated Systems
Automated gates and garage doors often use single phase motors controlled by VSDs. This setup enables variable speed control, improving the system's efficiency and lifespan.
How to Convert Single Phase Motor to Three Phase
Overview of Conversion Methods
There are several methods to convert single-phase power to three-phase power, each with its own advantages and applications. The most common methods include using phase converters and variable speed drives (VSDs).
Phase converters come in three types: Static, rotary, and digital. Static converters are the simplest and least expensive, but they provide the least efficient conversion. Rotary converters use a motor-generator setup to provide a more stable three-phase output. Digital converters utilize electronic components to create a precise and stable three-phase power.
Variable speed drives (VSDs) are another popular method. VSDs not only convert single-phase to three-phase power but also allow control over the motor speed, making them highly versatile. Understanding these methods helps in choosing the right approach for specific applications.
Step-by-Step Conversion Process
Determine Your Power Requirements: Assess the power needs of your equipment to choose the appropriate converter or VSD. Understanding the load and operational demands is essential for selecting the right conversion method.
Select the Conversion Method: Based on your requirements, decide whether to use a phase converter or a VSD. Consider factors such as cost, complexity, and the specific needs of your application.
Install the Converter/VSD: Mount the device according to the manufacturer's instructions. Ensure it is placed in a location with proper ventilation and accessibility for maintenance. Proper installation is crucial for the longevity and performance of the equipment.
Connect Input Power: Connect the single-phase power supply to the input terminals of the converter or VSD. Ensure all connections are secure and compliant with electrical codes. Proper connection prevents electrical faults and ensures stable operation.
Configure Output Connections: Connect the output terminals to your three-phase equipment. Follow wiring diagrams carefully to ensure correct and safe connections. Proper configuration is vital to avoid damaging the equipment and ensure it operates efficiently.
Test the System: Power up the system and test the output to verify it provides stable three-phase power. Adjust settings as necessary to achieve optimal performance. Regular testing and adjustment help in maintaining the efficiency and reliability of the system.
Most VSDs have side vents to allow for better airflow. These vents provide some degree of protection against solid foreign objects, but they do allow dust to accumulate inside the unit and on the vents themselves. This can prevent heat sinks and circulating fans from cooling the VSD unit. They require regular cleaning so the material doesn't build up enough to impede airflow or jeopardize performance.
Like most electronics, VSDs are vulnerable in the presence of moisture. Protecting storage spaces with dehumidifiers helps keep the ambient humidity level low enough to reduce the risk of corrosion. The open vents and unsealed cover mean that moisture can easily get inside the unit and cause corrosion. Even water dripping from a nearby dehumidifier unit can be enough to ruin the device, so it's important to plan the space correctly and regularly inspect on-site VSDs.
VSDs require tight connections to perform. The connections may loosen over time due to mechanical vibration, heat cycles, or even incidental movement throughout long periods of time. Facility managers should have the connections inspected regularly to check for loose connections.
Our Factory
Zhejiang Hertz Electric Co., Ltd. based on power electronics technology, motor drive and control technology, and relying on advanced production equipment and rigorous testing process, we provide customers with low-voltage and medium-voltage frequency converters, soft starters and servo control systems and related industry solutions.
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