Speed Adjusting Box

Details of Speed Adjusting Box

 

Working Voltage	AC 220V, 110V, 10% more or less is acceptable
Frequency	50Hz 60Hz
Application	1 phase AC motor, 3 phase AC motor
Output Power	A wide range like 10W 30W 90W 200W 400W and others
Speed	90 ~ 4000rpm
Ambient Tem.	-10 ℃ ~ 50 ℃
External dimension	Length 100 * Width 60 * Height117mm
Mounting	Panel Screw Install
Control mode	Forward / reverse selectable, just change the connection wire

 

 

What is a Speed Adjusting Box?

A motor speed controller is a device that adjusts the rotational speed of an electric motor by modifying input parameters like voltage, frequency, or current. It ensures the motor runs at the desired speed to match different operational needs.

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How It Works

Variable Frequency Drive (VFD)

Used for AC motors (e.g., induction motors).

Changes power frequency (and voltage) for smooth speed control.

Example: Reducing frequency from 50Hz to 25Hz halves the motor speed.

DC Motor Control

Adjusts armature voltage or field current for speed changes.

Common in trains, cranes, and electric vehicles.

PWM (Pulse Width Modulation)

Controls average voltage by rapidly switching power on/off (used in DC/stepper motors).

Other Methods

Pole-changing: Switches motor winding configurations for discrete speeds.

Slip control: Uses resistors or clutches to adjust speed in wound-rotor motors.

 

 

 

 

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