The Danger of Running 60Hz Motor on 50Hz Power Supply

At present, most European & Asian countries’ civilian standard AC voltage is single phase 220V (230v, 240v), 50Hz (single-phase two-wire, power frequency 50 Hz), industry-standard is three-phase 380V (400v, 415v, 420v), 50Hz (three-phase four-wire system, three-phase three-wire system).

The United States and Canada AC power supply frequencies are both 60Hz, according to American National Standard For Electric Power Systems, commonly used single-phase and three-phase electrical system as follows:

Civilians use 110 – 120V 60Hz single-phase three-wire system:

There is a neutral line, the voltage between the neutral and the other two lines is 120V 60 Hz, and the voltage between the other two is 240V 60 Hz (neutral line and a ground line are separated). 110-120V 60Hz single-phase three-wire system can be made 120V 60Hz single-phase voltage power supply for low-power handheld and mobile devices, such as power tools, lamps, fans, and other appliances. It can also be provided to small machinery 240V 60Hz single-phase voltage equipment. Due to the reasons for the access side substantially, 110v-120V, 240V standard power supply voltage will drop to 110V and 230V.

Industrial use 460V – 480V 60Hz three phase four wire system, 277V three phases four-wire system: Single-phase voltage is 277V, phase voltage is 480V. So the industrial three-phase power is divided into two voltages, respectively 230V three-phase four-wire and 480V three-phase four-wire system. Electric power tools and motor-based machines sold in the United States are usually labeled as a single-phase 110V 60Hz, single-phase 230V 60Hz, three-phase 230V 60Hz, and three-phase 480V 60Hz.

3 phase 4 wire system

For example, a single-phase 230V 60Hz motor-based equipment on the US market, if you run it on a single-phase 220V 50Hz power supply, then there will be serious problems occur, which will affect the motor quality directly, reduce the motor life, leading to the motor’s capacitors burning or even exploding.

Dangers of 60Hz Motor Run on 50Hz Power Supply:

1. Severe heating, no-load current increasing

When the power frequency decrease from 60Hz to 50Hz, it means the flux per pole increases by 20% corresponding, and the magnetic flux density of each part of the motor will also increase by 20%. Due to the motor design of the magnetic flux having a very small margin, it will greatly increase the load current by more than 20%. Since the magnetic flux density than the original increase of 20%, the saturation magnetic flux density of the core. In addition, with the speed of the decline in ventilation effect deteriorating, the motor temperature rises much higher than running it at 60Hz.

2. The power and rotation speed decrease

If the no-load current approaches or exceeds originally rated current, the motor cannot be operated; if the load current is still a wide gap between the motor capacities of at least 20% or less than the original and the motor speed can be decreased by about 17% at 50Hz running.

60Hz induction motor

3. Starting current increase rapidly, easy to overload

The motor is an inductive load, so the reactance value is proportional to the power frequency, the lower the power frequency, the lower the reactance value. The starting current is inversely proportional to the reactance in, the motor starting current will correspondingly to the original increase of about 20%.

4. Designed torque severely damage

Torque is inversely proportional to the size of the square of the power supply frequency. When the power supply frequency is changing from 60Hz to 50Hz, torque is increased. Similarly, the motor maximum torque and minimum torque will be increased. Motorists know what torque is, however, the increase in torque where power is not increased but undermines the design specifications of the motor.

5. Significantly shorten the life of the motor

Iron consumption is about 1.3 and power is proportional to the square of the magnetic flux density and frequency so that the iron loss increases 14%. Motor output power is greatly reduced, so that the efficiency of a certain decline, exacerbated by losses in the motor hardware components to shortens the life of the motor.

How to convert 60Hz to 50Hz?

You just need a GoHz frequency converter to convert the fixed volt to adjustable volt.

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