Variable speed AC drive is a device that converts AC power into a controllable DC power source and further converts this DC power source into an AC power source suitable for use with AC motors. Realize precise control of the motor, including start stop, speed adjustment, and operation status adjustment.

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HESG216875/K also known as:

Motherboard driver HESG216875/K

HESG216875/K Driver circuit board

Main control board HESG216875/K

HESG216875/K Drive control board

HESG216875/K Variable Speed AC Driver is a device that converts AC power into a controllable AC power suitable for use with AC motors. It drives the operation of the AC motor and achieves precise control of the motor by transforming the power supply and adjusting the output signal.

The working principle of HESG216875/K variable speed AC driver:

Input power processing:

Rectification: 

The HESG216875/K driver first converts the input power frequency AC power (such as 380VAC) into DC power through a three-phase bridge rectifier circuit. The rectifier circuit consists of six diodes. When a certain phase voltage is positive, the corresponding diode conducts and passes through a filtering capacitor to obtain the rectified DC power.

Filtering: 

The rectified direct current is smoothed through a filtering circuit to reduce current harmonic distortion and store energy. A filtering circuit typically includes a DC link and one or more capacitors.

Inversion and frequency conversion:

Inversion: 

DC power is then converted into variable frequency AC power through a three-phase inverter. The inverter consists of 9 thyristors and corresponding valve controlled diodes. According to the control of electronic switches, different thyristors are sequentially turned on and off to control the frequency and amplitude of the output AC power.

Variable frequency: 

By adjusting the control signal of the inverter, the frequency of the output AC power can be changed, thereby achieving control of the speed of the AC motor. The range of output frequency is usually between 2-400Hz.

Control circuit:

Signal conversion: 

The control circuit converts external input signals (such as switch signals, analog signals, and digital signals) into control signals through electronic components on the circuit board.

Control chip: 

The control chip is the core part of the control circuit, which generates control signals by processing input signals to drive AC motors. Common control methods include v/hz control, frequency conversion control, etc.

Protection circuit: 

The protection circuit can monitor the working status of the driver and take protective measures in the event of overcurrent, overvoltage, and phase loss faults to ensure the safe operation of the driver.

Motor control:

Speed control: 

By adjusting the frequency of the output AC power, the speed of the AC motor can be controlled. According to the synchronous speed formula of the electric motor (RPM=60 * f/p, where RPM is the motor speed, f is the power frequency, and p is the number of magnetic pole pairs in the motor), changing the frequency can change the speed.

Torque control: 

The torque of an electric motor is related to the ratio of voltage and frequency. In order to maintain the same torque, the voltage must also be adjusted proportionally when the frequency changes. Therefore, during the speed change process, it is necessary to maintain a fixed ratio of voltage to frequency.

Auxiliary components:

Temperature sensors, relays, fuses and other auxiliary components are used to achieve temperature monitoring, electrical isolation, thermal protection and other functions, ensuring the stable operation of the driver.

Characteristics of HESG216875/K Variable Speed AC Driver:

Wide speed regulation range:

The HESG216875/K variable speed AC driver can achieve extensive adjustment of the speed of AC motors, typically covering a maximum speed range of 25% to 100%.

The frequency (or hertz) is directly related to the motor speed (RPM), and the faster the frequency, the faster the RPM.

High efficiency:

The HESG216875/K driver has excellent efficiency characteristics over a wide range of speed/torque, meeting the requirements of electric vehicles and various industrial applications.

In typical driving cycle zones, an efficiency of 85% to 93% can be achieved, which helps to improve the continuous driving range after a single charge.

Energy recovery:

During regenerative braking, variable speed AC drives can achieve high energy recovery rates and reduce energy waste.

Quick response:

The HESG216875/K driver has fast torque response characteristics and can quickly and gently control the driving and braking torque within various vehicle speed ranges.

High control accuracy:

The digital servo control technology using DSP controller avoids the influence of temperature on control performance, improves control accuracy and stability.

In addition to simple PID operations, it can also achieve functions such as coordinate transformation and vector control, making modern control theory practical.

Networked control:

Due to the practical use of microprocessors, the driver has data exchange function, making it convenient for networked control.

Protection function:

The HESG216875/K driver is equipped with various protection functions, such as overcurrent, undervoltage, overheating, etc., to ensure safe shutdown or restart under abnormal conditions.

Strong scalability:

Variable speed AC drives support multiple communication protocols, such as Modbus RTU, PROFIBUS DP, CANopen, etc., making it easy to integrate and communicate with other devices.

Low maintenance cost:

The structure of AC motors is simple, maintenance costs are low, and they can operate stably in harsh environments, so AC motor drivers have advantages in many fields.

Widely applicable:

HESG216875/K variable speed AC drive is widely used in various situations that require high power and torque, such as industrial production lines, air conditioning systems, elevators, etc.

In summary, the HESG216875/K variable speed AC drive has become indispensable and important equipment in modern industry due to their wide speed regulation range, high efficiency, energy recovery, fast response, high control accuracy, networked control, protection function, strong scalability, low maintenance cost, and wide application.

Why do many of our products have more competitive prices?

(1) Source procurement to reduce price differences in intermediate links.

(2) Stable channels and more secure supply of goods.

Delivery time:

(1) Inventory products can be arranged for shipment on the same day after signing the contract for payment.

(2) Order products according to the quoted delivery date.

Zhangzhou Fengyun Electrical Equipment Co., Ltd adheres to the corporate philosophy of “spare parts supply chain, enhancing the value of spare parts”.

Our advantage:

Brand new original, with a one-year warranty provided after sales! All of our products have undergone strict testing, and we welcome inquiries and acquisitions. As long as you have sincerity.

Our company will provide you with competitive prices compared to our peers, and we will take orders together!

Fengyun’s internal environment:

The company has a registered capital of tens of millions, a five-star office environment, and hundreds of employees. Fengyun focuses on the four major system fields of DCS, PLC, robotics/large servo, and mainly produces various modules/cards, controllers, touch screens, and servo drives.

Company advantages:

Supply imported genuine products and professional discontinued accessories.

Company advantages:

Supply imported genuine products and professional discontinued accessories.

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