Inspection and installation of high-efficiency and energy-saving motors

We have previously introduced the inspection of high-efficiency and energy-saving motors before starting. It can be seen from this that before starting the motor, we must check its operating resistance, secondly check its appearance, and then check whether the machine is running. normal. So besides these, what else should we pay attention to when inspecting high-efficiency and energy-saving motors? And what should you pay attention to when installing it? Let’s discuss it together below!

1. Inspection

1. Carefully check the nameplate data of the high-efficiency and energy-saving motor to confirm that the motor model meets the usage requirements before use.

2. Use a regular 500V megger to measure the insulation resistance of the motor winding to the shell, and the insulation resistance should be greater than 0.5 megohm.

2. Installation

1. High-efficiency and energy-saving motors are generally installed in clean, dry places indoors. The surrounding environment must be well ventilated, and the air temperature in the environment should not exceed 40°C and the temperature should not be lower than -15°C, and strong thermal radiation should be prevented. .

2. The control electrical appliances of high-efficiency and energy-saving motors should have phase loss protection and overload thermal protection devices. YA series increased safety motors must select appropriate overload thermal protection devices based on the nameplate tE time and starting current ratio IA/IN.

3. Connect the power cord according to the wiring diagram. The terminal connection must be tight. Motors with -out cables and wires can be directly connected to the power cord, and the joints must be insulated and sealed.

4. When the power cord, phase sequence and the markings on the electric thick terminal are connected correspondingly, the motor rotates clockwise when viewed from the shaft extension end. When you need to change the direction of rotation, you only need to change the wiring positions of the two power cords.

5. Variable-stage multi-speed asynchronous motors such as the YD series use the method of switching wires to control changes in rotational speed. In order to ensure the reliability of multi-speed motor operation, attention should be paid to the design and operation of the control device when switching from high speed to low speed. , it is necessary to disconnect the neutral point of the 2Y wiring while cutting off the power supply to avoid causing a short circuit in the power supply when the low-speed winding is connected. During the process of switching from high speed to low speed, you must wait until the motor stops before turning on the power to the low-speed winding to reduce the impact on the motor and load. Pay attention to the steering of the motor when switching speed.

6. High-efficiency and energy-saving motors can use couplings, gears, belts and mechanical connections with the load. 2-pole motors above 4kw and 4-pole motors above 30kw should not be driven by belts. The second shaft extension of the double-axis extension can only use a coupling. Loud transmission. The tightness of the coupling, pulley shaft hole and motor shaft should be appropriate, and it is strictly forbidden to use a heavy hammer to strike during installation. When coupling transmission is used, the center line of the motor shaft and the center line of the load mechanical shaft should coincide, and a gap of 1 to 3 mm should be left in the axial direction of the coupling. When a belt is used to transmit room motion, the center line of the motor shaft should be parallel to the center line of the load mechanical shaft, and the center line of the belt and the center line of the shaft should be kept perpendicular to each other.