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Introduction

Starters and motor drives are electrical control devices used to start, stop, protect, and regulate electric motors. Motor starters control the starting process to limit inrush current and reduce mechanical stress, while variable frequency drives (VFDs) regulate motor speed by adjusting the output frequency and voltage.

PUTAI supplies industrial motor starters and variable frequency drives for equipment OEMs, system integrators, project contractors, distributors, and maintenance teams. The product range covers medium- and high-voltage motor starting, low-voltage soft starting, and variable-frequency speed control for new equipment projects and replacement applications. The appropriate solution depends on motor design, starting load, power supply, required speed range, and existing control system.

TRQ Liquid MV Soft Starter
PUTAI TRQ Liquid MV Soft Starters cover 210–3,200 kW across the series, with selected 6 kV and 10 kV applications. They serve equipment OEMs, industrial distributors, motor and drive suppliers,...

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TH-HVF High Voltage Induction Inverter
PUTAI TH-HVF High Voltage Induction Inverters provide variable-speed control for high-voltage induction motors, with listed voltage options of 3 kV, 6 kV and 10 kV. The series serves equipment...

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TGRJ Solid Slip Ring Starter
PUTAI TGRJ solid-state soft starters are designed for 3–10 kV squirrel-cage induction and synchronous motors, with special designs available for 11 kV applications. They serve equipment OEMs,...

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Low Voltage VFD Frequency Inverter
PUTAI Low Voltage VFD Frequency Inverters provide adjustable-speed control for industrial AC motors. They serve OEMs, equipment manufacturers, distributors and maintenance teams sourcing drives...

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Low Voltage VFD Motor Starter
PUTAI Low Voltage Soft Starter Cabinets are designed for industrial equipment OEMs, system integrators, distributors, and maintenance teams. They provide controlled motor starting and stopping for...

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Product Range

TRQ Liquid Soft Starter
The TRQ Liquid Soft Starter is designed for heavy-load starting of compatible wound-rotor AC motors, with rated power from 210 to 3,200 kW and voltage ratings of 6 kV and 10 kV. Its liquid-based electro-hydraulic arrangement is suitable for medium- and large-capacity wound-rotor asynchronous motors used in ball mills, hoists, crushers, fans, and pumps.
The documented starting current and starting torque are both limited to no more than 1.3 times their respective rated values, with 5–10 consecutive starts specified. The applicable ratings depend on the selected model and starting conditions.

TH-HVF High Voltage Induction Inverter
The TH-HVF High Voltage Induction Inverter provides variable-frequency speed control for compatible medium- and high-voltage AC motors, with voltage options of 3 kV, 6 kV, and 10 kV. Its design uses series-connected power units, vector control, and optimized PWM technology.
It is suitable for pump and fan applications where motor speed needs to respond to process demand. The published efficiency is at least 98%, with a power factor of at least 0.95. The published output frequency range is 0–50 Hz, with 60 Hz operation also specified. Rated capacity, output frequency, cooling method, and control interfaces should be considered when matching the drive to the application.

TGRJ Solid Slip Ring Starter
The TGRJ Solid Slip Ring Starter is designed for controlled starting and stopping of compatible medium- and high-voltage motors, covering voltage ratings from 3 to 10 kV and power ratings from 200 to 15,000 kW. The product uses thyristor-based voltage regulation to control motor starting, reduce starting current, and support soft stopping and motor protection.
It is intended for industrial motor applications where controlled acceleration and electrical protection are required. Motor type, rated voltage, load characteristics, and protection requirements are important factors when selecting the appropriate configuration.

Low Voltage VFD Frequency Inverter
The Low Voltage VFD Frequency Inverter provides adjustable-speed control for low-voltage AC motors. By regulating output frequency and voltage, it enables motor speed to be adjusted according to equipment operating requirements.
The inverter uses IGBT-based power conversion and includes protection functions such as overcurrent, overvoltage, and overload protection. It is suitable for applications that require variable-speed operation and coordinated motor control.

Low Voltage Soft Starter Cabinet
The Low Voltage Soft Starter Cabinet provides controlled starting for low-voltage motors. It regulates the voltage supplied to the motor during startup to reduce inrush current and mechanical impact on the driven equipment.
The cabinet supports motor starting protection, including stall and fast protection functions. It is suitable for equipment that requires controlled acceleration without continuous variable-speed operation.

Product Selection Guide

Application requirement	Recommended product	Key specifications	Key factors to consider
Heavy-load starting of wound-rotor AC motors	TRQ Liquid Soft Starter	210–3,200 kW; 6/10 kV	Motor construction, starting torque, starting time, and start frequency
Controlled starting and stopping of compatible medium- and high-voltage motors	TGRJ Solid Slip Ring Starter	200–15,000 kW; 3–10 kV	Motor type, voltage, load characteristics, and protection requirements
Variable-speed control of medium- and high-voltage motors	TH-HVF High Voltage Induction Inverter	3/6/10 kV	Motor rating, speed range, load profile, and control interfaces
Variable-speed control of low-voltage motors	Low Voltage VFD Frequency Inverter	Configuration-dependent	Motor power, speed range, and control method
Controlled starting of low-voltage motors	Low Voltage Soft Starter Cabinet	Configuration-dependent	Starting current, acceleration requirements, and protection functions

A soft starter controls motor voltage during startup to limit starting current and mechanical stress. A variable frequency drive changes the output frequency to regulate motor speed during operation. The choice depends on whether the application requires controlled starting only or continuous speed adjustment.

For replacement projects, compatibility also depends on the existing starting arrangement, power supply, control interfaces, protection settings, and installation dimensions.

Industrial Applications

Mining, Metallurgy, and Heavy Material Processing
Ball mills, crushers, hoists, and other heavy-duty equipment can place substantial demands on motor starting systems. The motor construction, driven load, required starting torque, acceleration time, and permitted starting frequency should be considered when selecting a starter or drive.

Pumps, Fans, and Industrial Utilities
Pumps and fans may require controlled starting or adjustable-speed operation to meet changing process demands. The operating profile, flow or pressure requirements, and control strategy help determine whether a soft starter or variable frequency drive is appropriate.

OEM Equipment and Replacement Projects
Equipment manufacturers and industrial maintenance teams need motor control solutions that fit the machine design and electrical system. For OEM projects, motor specifications, driven equipment requirements, starting or speed-control functions, and PLC interfaces are important matching factors.

For replacement projects, the existing motor and starter configuration should be reviewed before selecting a replacement unit.

Manufacturing Background and Quality Documentation
PUTAI has more than 25 years of motor industry experience. Its manufacturing facilities cover 200,000 m², with RMB 80 million in fixed assets and a workforce of more than 120 employees, including 18 technical engineers.

The documented production process covers motor manufacturing operations such as silicon-steel preparation, copper winding, insulation treatment, vacuum pressure impregnation (VPI), drying, assembly, and motor testing.

For industrial procurement and project documentation, relevant technical materials may include product datasheets, electrical schematics, inspection and test records, interface information, protection details, and applicable certificates or compliance documents. Documentation requirements can be identified during the project enquiry.

OEM Integration and Replacement Matching

PUTAI reviews starter and drive requirements according to motor data, driven equipment, and the existing electrical installation.

For OEM integration, the relevant information includes:
Motor type, rated power, voltage, and current
Driven equipment and load characteristics
Starting method or required speed-control range
Control requirements and PLC communication interfaces

For replacement projects, useful information includes the existing equipment model, motor nameplate, starter or drive model, wiring diagrams, cabinet photos, control interfaces, and installation dimensions.

Enquiry details should also include the required quantity, operating environment, and delivery destination. Replacement compatibility should not be determined by motor power alone; the existing electrical and control configuration also needs to be considered.

Frequently Asked Questions

Q: What is the difference between a soft starter and a variable frequency drive?

A: A soft starter regulates motor voltage during startup to limit inrush current and reduce mechanical stress. A variable frequency drive adjusts output frequency to control motor speed during operation. A soft starter is generally used when controlled starting is the main requirement, while a VFD is used when adjustable-speed operation is needed.

Q: What is the difference between the TRQ Liquid Soft Starter and the TGRJ Solid Slip Ring Starter?

A: The TRQ is designed for heavy-load starting of compatible wound-rotor AC motors and uses a liquid-based electro-hydraulic arrangement. The TGRJ Solid Slip Ring Starter is a thyristor-based starting solution for compatible medium- and high-voltage motor applications. Motor construction, voltage, load characteristics, and starting requirements determine which product is suitable.

Q: Can a variable frequency drive reduce energy consumption?

A: A VFD can help reduce energy consumption in applications where motor speed can be adjusted to match changing process demand, particularly in pump and fan systems. Actual savings depend on the load profile, system characteristics, operating hours, and control strategy.

Q: What information is needed for a starter or drive replacement enquiry?

A: Useful information includes the motor nameplate, existing starter or drive model, rated voltage and power, driven equipment, wiring diagrams, cabinet photos, control requirements, and installation dimensions. These details help assess electrical, functional, and mechanical compatibility.

Q: Can PUTAI starters and drives be integrated with PLC systems?

A: PLC integration depends on the selected product, control configuration, and required communication interfaces. Provide the PLC model, control signals, communication protocol, and operating requirements during the enquiry so that the interface requirements can be reviewed.

We are one of the most professional starters & drivers manufacturers and suppliers in China, also support customized service. With abundant experience, we warmly welcome you to buy advanced starters & drivers made in China here from our factory. For price consultation, contact us.