Can any motor be made variable speed?
To have electronically variable speed you will either need a universal/dc motor with PWM speed controller or a 3-phase inverter-duty induction motor with a variable-frequency inverter to control its speed.
Can you install a VFD on any motor?
Output voltages are available for VFDs to match almost any existing motor voltage. However, very few, if any, VFDs have a direct 13,800-volt output for very high-voltage motors. For these cases, using a step-up transformer on the output of the VFD is often necessary to match the motor voltage.
Can a single-phase motor be variable speed?
Speed control of single-phase induction motors is desirable in most motor control applications since it not only provides variable speed but also reduces energy consumption and audible noise. … Using microcontroller-based control systems, one can add speed variation to the system.
Can I use a potentiometer to control AC motor speed?
If you mean that you want to control the speed of an AC fan with a potentiometer, it is probably not possible. Whether an AC “mains” fan can be speed controlled with a pot depends on the technology used. Single phase induction motor – capacitor start usually.
Are all DC motors variable speed?
A: In general if you don’t do anything special to it, a DC motor will have variable speed. The main factors are the DC voltage applied to the armature coil and the amount of torque load you are trying to drive. In order to make it into a constant speed DC motor you have to have some sort of electronic feedback.
Can AC motors be variable speed?
When a voltage is applied to an AC induction motor, it runs at a certain speed. Variable speed requirements for AC induction motors are typically fulfilled by a 3-phase motor and an inverter or VFD.
How can I reduce motor speed without VFD?
Get a pump driven by a universal motor, (electric tools type, with brushes) and you’ll be able to use voltage variation to get variable speed. Or get a DC driven pump (as used in small ships) and you can also use this cheap electrical variable speed method.
How do I lower the RPM on my electric motor?
A couple of things you can do:
- Use gears to change ratio of speed, which is what you’re going to do. …
- Use a stepper motor, which are commonly used for high-torque, low RPM applications.
- Find some sort of PWM control circuit to slow it down, although you probably won’t be able to get it down to 5-10RPM.
Can you put a VFD on any 3 phase motor?
It is not necessary to have 3 phase electrical input in order to operate a 3 phase motor with a VFD. The electronics of the VFD will step up single phase current during the conversion process. … A 3 phase motor simply attaches to the appropriate output connectors on the VFD.
Can a 3 phase VFD run a single phase motor?
You can almost always use a VFD rated for three phase input with a single phase input power source. When only a three phase input VFD is available, it is acceptable and common practice to de-rate the VFD to work with a single phase input power source.