The forward and reverse rotation of a three-phase motor can be easily changed by swapping two of the three-phase AC input lines.

The method for determining the normal or abnormal condition of an AC motor is as follows:

First, manually rotate the motor shaft to check the bearing condition.

For an induction motor, check if it can be smoothly rotated by hand.

For a reversible motor, check if it can be rotated with slight force.

For a brake motor, apply power to the brake and check if it rotates smoothly by hand when the brake is released.

Second, measure the resistance values of the motor windings to check the condition of the windings.

For a single-phase AC motor, the resistance values between white-blue and white-red should be the same.

For a three-phase AC 220V motor, the resistance values between white-red, white-black, and red-black should be the same.

For a three-phase AC 380V motor, the resistance values between white-blue, white-black, and blue-black should be the same.

For a three-phase AC 440V motor, the resistance values between white-yellow, white-black, and yellow-black should be the same.

Third, if the circuit breaker operates when power is applied, there may be an issue with the insulation. In this case, do not continue to apply power and request A/S.

Overrun refers to the amount of rotation the motor continues after the input power is cut off until it stops.

When measured without a load, the overrun is as follows:

Induction motor: 30–40 rotations

Reversible motor: 5–6 rotations

Brake motor: 2–3 rotations

Clutch brake motor: 1–2 rotations

The smaller the overrun, the shorter the stopping distance, so please consider this when selecting a motor.

In the case of single-phase motors, a capacitor is essential for creating the rotating magnetic field.

If the capacitor is not properly connected, the issue you mentioned can occur.

Please check the connection status of the capacitor terminals. If the connection is normal, use a tester to measure the voltage between the two terminals of the capacitor to ensure it is at least 1.5 times the input voltage.

The products we manufacture are not inherently dustproof or waterproof.

If there is a risk of oil or water coming into contact with the motor, please consider adding covers or other protective measures to safeguard the motor. If water or oil enters the motor, it can cause insulation breakdown of the motor coils and may lead to bearing damage or other issues.

For reference, our lead-wire type motors have an IP20 rating, while the terminal box-equipped induction and reversible motors have an IP40 rating as standard. If requested, we can provide customization to meet IP54 standards.

If you directly connect a motor with an AC 220V input rating to an AC 240V power supply, the motor's temperature will rise rapidly, potentially causing the motor to burn out.

The AC 220V motor's power input specification is AC 220V ±10%, but when used in an AC 240V power supply environment, there may be situations where up to AC 264V is supplied, considering the voltage fluctuation of AC 240V. In such cases, the motor may exceed its allowable input voltage range, leading to a rapid increase in temperature.

As the motor’s characteristics may change, we recommend considering the use of a transformer.

Additionally, we have motors that are compatible with various voltage specifications used internationally, so please select a product that matches the required voltage specification.

Three-phase motors do not require capacitors because the three-phase AC power supply inherently provides three-phase voltages that are 120 degrees out of phase from the start.

However, single-phase motors are supplied with single-phase AC power, which is in-phase (the same phase). To create a rotating magnetic field and start the motor, a capacitor is used. The capacitor provides the phase-shifted power necessary to generate the rotating magnetic field.

A capacitor is essential for the proper startup of a single-phase motor.

For the startup of our single-phase AC motors, it is acceptable to use a capacitor with the same capacity. However, electrolytic capacitors should not be used.

The capacitors supplied with our single-phase AC motors are selected from products that have passed our internal quality verification system and tested for optimal performance. Therefore, we recommend using the same product for the best results.

 

Inverters are designed to adjust the voltage and frequency of three-phase AC motors, allowing for easy speed control of the motor. 

In conclusion, single-phase AC motors cannot be used in combination with an inverter, so using a speed control motor will allow you to conveniently adjust the speed.

Induction motors, reversible motors, brake motors, and clutch brake motors that use single-phase AC power have their rotation speed determined by the power supply frequency.

When the power supply frequency is 50Hz, the motor will rotate slower compared to when it is 60Hz. However, since the power supply frequency cannot be arbitrarily changed by the user, you can conveniently adjust the speed by using speed control motors in combination with speed controllers such as FX3000, DSA and DSKM