GTAKE specializes in designing and producing innovative AC drives (also known as variable frequency drives), electric vehicle motor controllers, bidirectional DC sources, and test rigs with advanced control algorithms and cutting-edge technology, delivering optimal performance and reliability for industrial automation and new energy applications.
GTAKE Elevator Frequency Inverters are designed to regulate the frequency and voltage supplied to elevator motors, enabling controlled motor speed, acceleration, deceleration, and stopping. As a type of variable frequency drive (VFD), an elevator frequency inverter can adapt motor operation to different travel stages and load conditions, supporting smooth elevator movement, precise speed regulation, energy-efficient operation, and reliable motor control.
An elevator frequency inverter changes the output frequency supplied to the elevator motor instead of operating the motor at a fixed frequency.
By continuously adjusting the motor’s operating frequency, the drive can create different speed stages during an elevator’s travel cycle.
A typical elevator movement may include:
Starting → Acceleration → Constant-Speed Travel → Deceleration → Leveling → Stop
The frequency inverter coordinates the motor’s output frequency with the required speed profile, allowing the elevator to transition between these stages in a controlled manner.
This makes variable frequency control an important technology for modern elevator motor systems.
The output frequency of an inverter directly influences the operating speed of an AC motor. Controlling this frequency allows the elevator system to establish different motor speed levels without relying only on mechanical control.
During startup, the inverter gradually increases the output frequency rather than applying the full operating frequency immediately.
This provides controlled motor acceleration and helps reduce sudden mechanical impact during elevator starting.
During normal travel, the inverter adjusts the output frequency according to the required elevator speed.
This enables multi-stage speed control for different elevator travel conditions.
Before reaching the target floor, the inverter reduces the motor frequency according to the programmed speed profile.
Controlled deceleration helps prepare the elevator for low-speed leveling and final stopping.
During the final approach, the elevator motor operates at a lower frequency and speed.
Precise low-speed control can contribute to floor leveling accuracy and smoother stopping.
The performance of an elevator frequency inverter depends on more than its maximum output frequency. The complete control process needs to coordinate speed, torque, braking, and motor feedback.
Accurate speed regulation allows the elevator motor to maintain the required speed under changing load conditions.
This is particularly important when the elevator transitions between low-speed leveling and normal travel.
The acceleration profile determines how quickly the motor reaches its target speed.
A properly configured elevator acceleration curve can reduce sudden changes in motor speed and contribute to passenger comfort.
The inverter controls motor frequency during deceleration to create a predictable transition from travel speed to leveling speed.
The selected deceleration curve needs to match the motor, load, elevator speed, and mechanical system.
Frequency changes must be coordinated with motor torque.
Suitable torque control helps the motor maintain stable operation when the elevator accelerates, decelerates, starts under load, or changes operating conditions.
Fine frequency adjustment allows the inverter to make smaller changes to motor speed.
This can be useful for applications requiring precise low-speed operation and elevator leveling.
An elevator frequency inverter can improve motor energy management by supplying the motor with the frequency and voltage required for its current operating condition.
Instead of continuously operating the motor at a fixed electrical condition, variable-frequency control allows motor operation to change according to the elevator’s movement.
Energy performance is also influenced by:
For elevators with frequent braking and changing load conditions, regenerative braking can be considered as part of the overall energy-management architecture.
During elevator deceleration, the motor may operate as a generator and produce electrical energy.
Depending on the elevator system, this energy can be handled through different braking configurations.
A dynamic braking system dissipates regenerated electrical energy through a braking circuit when required.
This configuration can be used where controlled deceleration is needed and regenerative energy is not returned to the building power system.
A regenerative elevator drive can convert regenerated motor energy into usable electrical energy for the system.
This approach can improve elevator energy efficiency, particularly in applications with frequent regenerative operating conditions.
Different motor-control technologies can be used with variable-frequency elevator drives.
V/f control maintains a defined relationship between motor voltage and frequency.
It provides a relatively straightforward method of variable-frequency motor control.
Sensorless vector control provides more advanced control of motor speed and torque without requiring encoder feedback.
It can provide improved motor performance while reducing the need for additional feedback hardware.
Closed-loop vector control uses feedback from the motor to improve speed and torque regulation.
It is particularly useful when an elevator system requires higher speed accuracy, positioning performance, and low-speed control.
Residential systems typically emphasize quiet movement, smooth acceleration, low-speed control, and compact integration.
Passenger elevators require consistent speed control, acceleration, deceleration, floor leveling, and ride comfort under changing passenger loads.
Commercial elevators may experience frequent operation and changing loads. Their frequency inverter needs to provide stable performance over repeated travel cycles.
High-rise applications may require higher travel speeds and longer operating cycles, making speed regulation, torque response, braking, and motor thermal management important considerations.
Freight elevators typically operate with heavier and more variable loads. Starting torque, overload capability, frequency control, and braking performance should therefore be considered when selecting the drive.
The correct elevator frequency inverter should be selected according to the complete motor and elevator system.
Important parameters include:
Motor type → Motor power → Rated current → Elevator speed → Load → Starting torque → Feedback → Braking → Operating environment
Confirm whether the system uses an asynchronous motor or PMSM motor and whether the inverter supports the required control method.
Check the inverter’s output frequency range and ensure it covers the elevator’s required operating speed.
Evaluate the drive’s overload capacity according to the maximum elevator load and starting conditions.
Determine whether the application requires sensorless control or encoder-based closed-loop control.
Select the appropriate dynamic braking or regenerative braking configuration according to the elevator’s operating cycle.
GTAKE develops AC drives and motor-control technologies for industrial and new-energy applications, including dedicated solutions for elevator systems.
The GK620E Elevator Dedicated AC Drive is designed for compatible elevator motor-control applications and supports the control requirements of passenger and freight elevator systems.
Its elevator-oriented functions can be used for speed regulation, acceleration and deceleration control, motor control, and elevator operation.
View the GK620E Elevator Dedicated AC Drive →
The application of variable frequency drives in elevators involves motor selection, frequency control, braking, feedback, and elevator system integration.
Explore related resources covering:
An elevator frequency inverter is a variable-frequency motor drive that regulates the frequency and voltage supplied to an elevator motor, allowing controlled motor speed and torque.
Frequency inverters allow elevator motors to operate at different speeds during starting, acceleration, travel, deceleration, and leveling instead of operating at a fixed frequency.
For an AC motor, changing the supplied frequency changes the motor’s operating speed. The inverter uses this relationship to control elevator movement.
Elevator inverter is a broader term for motor-drive equipment used in elevator systems. Elevator frequency inverter emphasizes the variable-frequency control function of the drive.
Yes, a compatible drive can control PMSM elevator motors when the required motor-control algorithm and feedback configuration are supported.
Variable-frequency control can help optimize motor operation according to travel conditions. Overall energy savings depend on the motor, elevator load, travel profile, braking system, and inverter efficiency.
Regenerative braking allows electrical energy generated during certain deceleration conditions to be managed or recovered rather than simply dissipated as heat.
