Variable Frequency Drive

Variable Frequency Drive (VFD), also known as variable speed drive, variable-voltage/variable-frequency (VVVF), frequency inverter and AC drives. VFD is a power control device that controls AC motor by converting fixed industrial frequency 50/60Hz to variable frequency. VFD adjusts the voltage and frequency of output power supply by disconnecting the internal IGBT, or provides the required power supply voltage according to the actual needs of the motor, so as to realize the goal of energy-saving and speed regulation.

The variable frequency drives we often refer to are usually low voltage VFDs, which are classified as single phase VFD and three phase VFD. ATO.com supplies high quality and low cost variable frequency drives, power capacity from 1/2 hp to 500 hp, including three phase 220v, 380v, 400v, 480v input VFD, and single phase 120v/220v input VFD (single phase to three phase, single phase input & output).
At many sites, people often encounter problems that cannot use three phase power supply, but only single phase 110v/120v or 220v/230v supply, such as farms, homes, and stores. For three phase motor, using a single phase to three phase VFD as a phase converter to drive the motor is a good solution. Similarly, single phase motors and split phase motors can also be powered and speed controlled by variable frequency drives. Single Phase 110v/120v input, 1-phase / 3-phase 220v-240v output VFD from ATO can be your choice.

2hp single phase 110v/120v VFD parameters

Capacity: 2hp (1.5 kW)
Rated current: 7 amps
Input voltage: 1 phase 120V AC ±15%
Output voltage: 1 phase / 3 phase, 0 to 220V AC ±15%
Input frequency: 50/60 Hz
Output frequency: 0 to 400 Hz
Dimension: 118*185*157 mm
Weight: 3 kg



Dredging ship still uses the diesel engine, which has the disadvantages of large noise, high energy consumption and complex operation. With the popularized application and easy operation of motor, as well as the vigorous promotion and application of VFD, most dredging ships also adopt the VFD motor drive system at present, and next this paper introduces the solution of variable frequency speed regulation with VFD in the dredging ship.

The rotating speed of inductor type AC motor (hereinafter referred to as motor) is determined by the number of pole and frequency. Working principle of the motor determines that the number of pole is fixed and invariable. As the pole number is not a continuous number (times of 2, such as 2, 4, 6), it’s improper to regulate the motor speed by changing the pole number.
In addition, the frequency can be adjusted outside the motor and then supplied to the motor, so that the motor’s rotation speed can be freely controlled. Therefore, variable frequency drive with a purpose of frequency control is a preferred equipment for motor speed control.
Variable frequency drive (VFD) is an adjustable speed drive used for motor drive system, control the speed and torque of the AC motor by changing the electromechanical input frequency and voltage. Also termed variable speed drive, AC drive or frequency inverter. The VFD is a device that converts an industrial frequency power supply (50 Hz or 60 Hz) into an AC power source with various frequencies to realize varying speed operation of the motor.
VFD control circuit completes the control of the main circuit, the rectifier circuit converts the alternating current into direct current, and the direct current intermediate circuit smoothes the output of the rectifier circuit, and the inverter circuit reverses the direct current into alternating current. The VFD achieves the purpose of speed regulation by changing the power supply frequency of the stator winding of the motor.
According to the engineering experience, the VFD shall well fit with the motor power and a residual shall be reserved, so the VFD with a larger specification shall be selected. If the motor used on site needs to start and brake frequently, the brake resistance must be installed, its size shall be determined according to the power. If the equipment is required for aging testing, four quadrant products can be considered to effectively reduce power loss. If there is a separate DC current in the field, the pure inverters can be used to save investment. Moreover, a reactor must be added at the input end of high-power VFD, so as to improve the power quality of input equipment and its power factor.

Variable Frequency Drives
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