What are Inverters and AC Input Brushless DC Motors?
Hmm, I can't decide which one to choose.
Oh? What's wrong?
A customer told me "I want to use an inverter or a brushless DC motor for speed control." I know about AC speed control motors, but I'm having trouble deciding which one is better for speed control, an inverter or a brushless DC motor.
Well, first of all, you need to know the features of inverters and brushless DC motors.
Ms. Ori! First of all, could you tell me about the features of the inverter?
Inverters are used in combination with a three-phase 200 VAC motors to control the rotation speed by changing the power supply frequency. All you need to connect is a power supply and a three-phase motor, and you can easily perform speed control.
Wow, that's easy. But I've heard that inverters have some troublesome settings... Is it difficult to use?
For example, in the case of general inverter control that changes the voltage in accordance with changes in the frequency, if a low value is set for applied voltage when operating at low speed, the motor may not produce a torque at low speeds.
I see. So if I have a separate motor and inverter, does that mean I need to change the settings?
Yes, you can't say for sure that there would be no need to change the settings. But our speed control motor and inverter packages are already preset to bring out the best characteristics of the motor so you can use it without any worries.
I see. In that case, I guess I'll recommend them a speed control motor and inverter package for simple speed control.
Wait, wait. Don't go jumping to conclusions. Don't forget, there are still the brushless DC motors for speed control. Not only the energy and space saving, but they can perform speed control with constant torque... You need to know the features of each options before introducing them to the customer.
Energy saving? Space saving? Constant torque?
Alright, let's start with space saving. The rotor inside the motor uses a powerful permanent magnet. That's why it's not only a high power, but it also means the motor is compact, allowing it to be space saving.
You're right! Brushless DC motors are very thin and compact!
Yes. That allows it to contribute to equipment downsizing.
I see! But wouldn't the smaller size generate more heat?
Not really. Brushless DC motors are more efficient and energy-saving because they have current control, which does things such as applying as much current as it needed.
I see. Furthermore, speed fluctuations are small when the load changes, and constant torque can be obtained from low to high speeds!
That's right. So now you know what's good about brushless DC motors.
Hmmm... Both the speed control motor, inverter package and the brushless DC motor, driver package have their good points, and now I'm not sure which one I should actually recommend to my customers...
It's easy. You just need to keep the features of each in mind and recommend the best unit for the customer's equipment.
Ah, okay. I'll contact the customer right away! Thank you for everything, Ms. Ori.
