Oriental Motor

Oriental Motor BMU Series Brushless DC Motors

Brushless DC Motors vs. Servo Motors vs. Inverters

When it comes to speed control, you may think the choice is between an inverter driven three-phase motor or servo motor, but did you know that brushless DC motors specialize in speed control? The brushless DC motor is growing in popularity in the world of speed control. However, not everyone is familiar with the power and performance to cost aspects of the brushless DC motor. Even in usage situations where it has demonstrated its capabilities, it tends to lag behind the two leading players, the inverter driven three-phase motor and the servo motor. This article introduces the capability of brushless DC motors, as well as points to consider when choosing a compact speed control motor.

BMU Series Brushless DC Motors

Inverter or Servo Motor: Which Should be used to Control Speed?

When it comes to speed control, the common choice is a three-phase induction motor that controls speed by use of a general-purpose inverter. For many, this may be the natural choice because it allows you to freely set a temporary driving speed that you can change in the future. Indeed, the inverter is commonly used, but does it actually meet basic needs or solve common complaints?

Is it convenient to change the speed every time the task (weight or viscosity) changes?

What happens if you want to run the conveyor at high speed while transporting products, and then at a low speed during inspection?

When synchronizing the speed of more than two conveyor lines, the speed must be adjusted can this operation be done simply?

If speed, torque, or improved controls are needed, upgrading to a servo motor is certainly an option. However, considering the relatively low cost of the inverter driven three-phase motor, by changing to a servo motor you will face the problem of increasing expenditure. The servo motor stabilizes speed and solves the problem of synchronization of multiple conveyors, but taking cost into consideration, compromises in your setup would almost certainly be necessary. Is there any product which is easy to use and which does not lead to increased costs?

Synchronize Two Motors Application ExampleInconsistent Conveyor Speed ApplicationMix Constant Speed ApplicationConveyor Application Example


In fact, there is an effective third alternative. The brushless DC motor is similar in structure to a servo motor, however specifically designed for speed control.

Servo Motor Performance at Inverter Prices: Brushless DC Motors, the Third Alternative

The position of the brushless DC motor is, in simple terms, between the inverter and the servo motor. It is a motor dedicated to speed control that controls speed as effectively as a servo motor for a lower price, closer to that of an inverter.

List of BMU Series Brushless Motors Models

Product Name
[Speed Control Motors]
Output Power
Gear Head Reduction Ratio Applicable Controller Power Supply Input
[Single phase]
BLM230-10B 30W 10:1 BMUD30-C2 220/230 VAC 50/60 Hz
BLM230-30B 30W 30:1
BLM460S-10B 60W 10:1 BMUD60-C2
BLM460S-30B 60W 30:1
BLM5120-10B 120W 10:1 BMUD120-C2
BLM5120-30B 120W 30:1

We have two types of cables length available. For 3 metres: CC03BL2 and for 5 meters: CC05BL2

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Application Video

Speed Control Motors