Year1
- 名称：
- 阀门电机
- 电压：
- 440V/380V/220V
- 功率：
- 0.75
1. Performance of special motor for valve electric device
The torque of the valve motor conforms to the opening and closing torque characteristics of the valve. Generally, the torque value required for a short time to open and close a valve is high, and the required torque value in the intermediate operating state is only 1/2 of the maximum torque value for opening or closing. Therefore, the special motor for valves is characterized by high starting torque. Strong overload capability. The ratio of the maximum torque of the valve-specific motor to the rated torque value is more than 10 times, and the ratio of the starting torque to the rated torque value is also 100 times.
The rotor shape of the valve-specific motor is slender. Therefore, the high-speed rotating motor adds a small inertial load to the valve seal when the valve is closed, which can ensure the reliability of the valve sealing surface without damaging the valve sealing surface.
Since the operation of the valve is an intermittent short-time working system, the working hours of the valve's special motor are stipulated in accordance with national standards, and the hours of some foreign products are.
The end face outlet of the valve-specific motor has no junction box, no fan, self-cooling, and high protection performance. The general standard, the highest level, is a submersible motor.
2.
Valve electric device
Special motor failure analysis
The special motor for valves equipped with low-protection electrical equipment is a fully enclosed squirrel-cage structure and works intermittently for short periods of time. Cooling type. According to the requirements, the minimum protection level and the maximum protection level. Depending on the operating conditions and environment of the valve, the required protection levels are also different. A low protection level will cause moisture or foreign matter such as dust to invade the inner cavity of the motor, and the insulation resistance of the motor will decrease, causing damage.
Improper packaging, transportation and storage. Valve electrical packaging should be rain-proof, moisture-proof and dust-proof, and the packaging should be firm and reliable. Rainproof measures should be taken during transportation. After arriving at the site, the product should be stored in a ventilated and dry place and should not be stored in the open. It is forbidden to debug or repair in rainy weather. After debugging, all fasteners must be tightened to ensure that all electrical parts are sealed tightly and reliably.
Improper control of valve electrical equipment selection and stroke position adjustment
Valve electrical equipment has two important parameters
① The opening and closing torque value should include the actual working torque value of the valve plus the valve's own torque value. The size of the opening and closing torque affects the use of the valve. If the force is large, it is easy to break, and if the force is small, it is easy to leak. There should be sufficient margin in the selection and matching (generally required to be ~ times greater than the actual operating torque value of the valve).
② Stroke position control is related to the valve diameter, opening and closing time, structural form, etc. The motor matching the valve's electrical assembly is a special motor with short-time working hours. If the load is high during a short working period, the heat insulation level of the motor will decrease and cause damage.
The valve electrical installation does not match the motor model. The selected motor model does not match the electrical installation requirements. The actual output torque does not leave enough margin, which may easily cause damage to the motor during overload operation.
Electrical protection failure, poor quality of electrical components
The microswitch in the valve electrical assembly is a key component of the control mechanism. When the valve exceeds the stroke position, the microswitch cuts off the power supply and acts as overload protection. Most electrical equipment manufacturers connect stroke and torque protection in series. When over-travel or over-torque occurs, the micro switch promptly cuts off the AC contactor coil control power supply, thereby cutting off the main circuit of the motor.
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