What exactly is a pulsator variable frequency motor?
It's a drive motor that primarily converts electrical energy into mechanical energy. This conversion is achieved by harnessing the force exerted by a rotating magnetic field, generated by the pulsator variable frequency electricity flowing through its coil. The motor primarily consists of two main components: an external fixed stator, which has coils supplied with pulsator variable frequency current, and an internal rotor fixed on the output shaft.
How does a pulsator variable frequency motor work?
The basic operation of a pulsator variable frequency motor relies on magnetic principles. It includes a coil and two fixed magnets around the shaft. When an electrical charge (AC) is applied to the wire coil, it becomes an electromagnet, generating a magnetic field. In essence, when the magnets interact with each other, the shaft and the wire coil begin to rotate, thereby driving the motor.
Pulsator variable frequency motor products offer two options for feedback control: resolvers or encoders.
Both resolvers and encoders can sense direction, speed, and the position of the output shaft. Despite resolvers and motor encoders offering similar solutions in various applications, they have significant differences.
Pulsator variable frequency motor rotary transformers use a second set of stator windings (called transformers) to generate rotor voltage across the air gap. As rotary transformers lack electronic components, they are very robust and can operate over a wide temperature range. Rotary transformers also have inherent shock resistance due to their design principle and are typically used in harsh environments.
AC Motor optical encoders use a rotating shutter to disrupt the light beam passing through the gap between the light source and the photodetector. Over time, the rotation of the shutter can cause wear on the encoder. This wear reduces the durability of the optical encoder and decreases its reliability.
The type of application will determine whether a resolver or an encoder is needed. Pulsator variable frequency motor encoders are easier to implement and more precise, making them the preferred choice for any application. Resolvers should only be chosen when the environmental requirements call for their use.