The motor protection equipment of electric hoist is an important component to ensure the safe and stable operation of electric hoist. These protective devices mainly have the following functions:

1、 The main types of motor protection equipment

Overload protector:

Function: When the load of the electric hoist exceeds its rated carrying capacity, the overload protector will automatically cut off the power supply to prevent the motor from overheating, burning out, or other faults.

Characteristics: It usually has high precision and fast response capability, and can quickly cut off the power supply in case of overload, protecting the motor from damage.

Underload protector:

Function: Although the main protection focus of electric hoists is overload, underload protectors also play an important role. When the load of the electric hoist is far below its rated load, the underload protector will issue an alarm signal to remind the operator to check the equipment to prevent other potential problems caused by insufficient load.

Thermal relay:

Function: As a form of motor overload protection, thermal relays detect changes in motor current to determine if overload has occurred. When the motor current exceeds the set value, the thermal relay will activate to cut off the power supply to protect the motor.

Current transformer:

Function: Used for real-time monitoring of the current status of the motor. By detecting the current value, the current transformer can promptly detect motor abnormalities such as short circuits, overloads, etc., and transmit this information to the control system to take corresponding protective measures.

Soft starter:

Function: During the motor start-up process, the soft starter can reduce current shock, minimize the impact on the power grid, and protect the motor from mechanical shock. It achieves smooth starting by slowly increasing the input voltage and current of the motor.

Frequency converter:

Function: In addition to controlling the speed of the motor, the frequency converter also has motor protection function. By precisely controlling the voltage and frequency of the motor, the frequency converter can prevent the motor from operating under abnormal conditions such as overload, undervoltage, and overvoltage, thereby protecting the safety and stability of the motor.

2、 The Importance of Motor Protection Equipment

Improving equipment safety: Motor protection equipment can promptly cut off power or issue alarm signals to prevent the motor from operating in abnormal conditions, thereby avoiding equipment damage and personnel injury.

Extending equipment lifespan: By reducing the operating time of motors under abnormal conditions such as overload and underload, motor protection equipment helps to extend the service life of motors.

Improving production efficiency: Ensuring stable operation of electric hoists under rated load can reduce downtime caused by equipment failures, thereby improving production efficiency.

The main equipment produced by Hebei Makita: stage electric hoist, electric chian hoist, wire rope electric hoist，Hand chain hoist, lever hoist, pneumatic hoist and other lifting equipment