What is the difference between variable frequency motors and variable speed motors?

1. The working principle is different: a variable speed motor changes the speed by changing the input voltage or current, while a variable frequency motor changes the speed by changing the frequency of the input motor.

2. Different speed regulation ranges: The range of speed regulation by changing the current or voltage is limited, while the range of speed regulation by variable frequency is more extensive.

3. Different adjustment methods: Speed regulating motors generally use switches or knobs for speed regulation. And variable frequency speed regulation requires the use of specialized frequency converters for control.

4. Different functions: Speed regulating motors generally have fewer functions and lower safety. Variable frequency motors can achieve overload protection, automatic on-off, and other functions. If the demand is relatively single and the speed range needs to be adjusted is not large, a relatively low-cost variable speed motor can be chosen. If you need a large range of speed regulation, precise numerical requirements, and high safety assurance, it is recommended to choose a variable frequency motor.