Low Voltage vs High Voltage Three Phase Motors: Whats the Difference?

Low Voltage in Comparison to High Voltage Motors

Motors fall into two general categories: low voltage and high voltage. But how do they differ? Let’s put it into the plain language you can understand.

Three Phase Motor Voltage Ratings

In Understanding and Choosing Three-Phase Motors we developed the idea that the three phases of the incoming power form a rotating magnetic which spins the rotor of the motor. This rating essentially lets us know how much voltage the motor can take. Machines usually are classified as low-voltage (less than 600 volts) or high-voltage (more than 600 volts).

Selecting the Correct Voltage for Your Motor

Now that we have an understanding for what three phase motor voltage ratings are all about, how do we decide the appropriate motor voltage? At the end of the day it comes down to what your application actually needs. Smaller low voltage motors are more commonly found in residential and light commercial situations and larger high voltage motors are generally located in industrial settings where there is a need for more powerful motors.

Effects of Voltage on the Performance of Three Phase Motor

Voltage is key to optimal operation of three phase asynchronous motor. Typically, a higher voltage indicates the motor can deliver more power, which means it’s good for heavier-duty tasks. Conversely, a lower voltage motor may be the most cost-effective option if you only need a smaller, limited capacity system.

Low Voltage Vs High Voltage Motors Many times in industrial applications, motors are needed of high power and are designed to match the voltage.

In Factories, the decision to use low voltage motors or high voltage three phase motor has a lot to do with the plant in question as well. High voltage motors work well with heavy machines and equipment which needs lot of power to function effectively. For smaller machines or those not needing as much power, low voltage motors may be more appropriate.