What is Variable Speed Motor?
A variable speed motor is a motor that has a variable frequency drive or similar technology installed to control motor speed and torque, by placing these key factors of motor performance under the control of the operator, variable speed motors offer a means for products and production facilities to greatly reduce the amount of energy being consumed by the motors in their devices. Unlike single-speed motors that run at full capacity and then cycle off, a variable-speed motor can operate at high speeds, low speeds or anywhere in between, ramping up and down like a dimmer switch. Variable speed motors are widely used in places that require energy-saving continuous operation and frequent work, such as fans, air compressors, injection molding machines, reducers, water pumps, vacuum pumps, etc.Construction principle
When the speed of the asynchronous motor does not change much, the speed is proportional to the frequency. It can be seen that changing the frequency of the power supply can change the speed of the asynchronous motor. In frequency conversion speed regulation, it is always hoped that the main magnetic flux remains unchanged. If the main magnetic flux is greater than the magnetic flux during normal operation, the magnetic circuit will be over-saturated and the excitation current will increase and the power factor will decrease; if the main magnetic flux is less than the magnetic flux during normal operation, the motor torque will decrease.
The special speed conversion motor has the following characteristics:
- Designed with class B temperature rise, Class F insulation manufacturing. The using of polymer insulating materials and vacuum pressure dipping paint manufacturing process and the use of special insulation structure make the electrical windings use insulation withstand voltage and mechanical strength greatly improved, which is sufficient for the high-speed operation of the motor and resists the high frequency current impact and voltage of the inverter.
- The balance quality is high, and the vibration level is R (reduced vibration level). The machining accuracy of mechanical parts is high, and special high-precision bearings are used, which can run at high speed.
- Forced ventilation and heat dissipation system, all imported axial fans are ultra-quiet, long-life, and strong wind. It ensures that the motor can effectively dissipate heat at any speed, and can achieve high-speed or low-speed long-term operation.
- Compared with the traditional variable frequency motor, it has a wider speed range and higher design quality. The special magnetic field design further suppresses the high-order harmonic magnetic field to meet the design indicators of wide frequency, energy saving and low noise. It has a wide range of constant torque and power speed regulation characteristics, stable speed regulation, and no torque ripple.
- It has good parameter matching with all kinds of vfd, and with vector control, it can realize zero-speed full torque, low-frequency high-torque and high-precision speed control, position control and fast dynamic response control.