Bürstenlose DC-Motoren
Kompakte, leichte, leistungsstarke und dennoch hocheffiziente Motoren. Ausgestattet mit einem kleinen Sensor und einem dedizierten Schaltkreis, gewährleisten diese Motoren eine stabile Drehzahlsteuerung und verfügen über einen großen Drehzahlregelbereich.
Bürstenlose DC-Motoren
Übersicht und Zusatzinformationen
Overview
Brushless motors do not have the mechanical contact between the brush and commutator, which is a disadvantage of DC motors.
DC motors rotate by using a brush and commutator, so maintenance for these parts must be performed regularly. However, brushless motors rotate using signals detected by a hall sensor, which means they are maintenance-free.
System Configuration
Driving is performed by a motor equipped with a built-in hall effect IC for detecting speed that is combined with a driver (control circuit).
The motor rotation speed is set using a speed potentiometer, external DC voltage or a digital operator.
Structure
Brushless motors use permanent magnets in the rotor of three-phase motors. In addition, inside of the stator, there is a built-in hall sensor that detects magnetic field changes with the permanent magnets.
Control Block Diagram
The driver speed controller compares the speed feedback signal from the built-in hall effect IC in the motor with the speed command signal set by a speed potentiometer or similar.
The comparison result is sent to the inverter. The inverter adjusts the voltage applied to the motor and controls the motor rotation speed.
Speed - Torque Characteristics
Brushless motors can operate continuously with a constant torque from low speed to rated speed. In addition, if within the rated torque, these motors rotate at a stable speed even when the load size changes.
With brushless motors, there is a continuous duty region (①) where continuous duty is possible and a limited duty region (②). The limited duty region can be used for acceleration torque when starting an inertia body.
If operation continues for 5 seconds min. in this region, the overload protective function activates and the motor is stopped.
Features
Excellent Speed Stability
Brushless motors compare the setting speed with the speed feedback signals from the motor at all times and adjust the motor's applied voltage. For this reason, even if the load changes, rotation at a stable speed is performed from low speed to high speed.
With inverter-controlled (V/F control) three-phase induction motors, feedback control is not performed, so the speed will drop significantly when the load increases. Brushless motors are recommended for applications where speed stability is important.
Speed regulation (load) for each model is as shown below. The extent to which the rotation speed changes when the load changes from 0 to rated torque is shown.
| Model | Speed Regulation With Respect to the Load | |
|---|---|---|
| Conditions | ||
| BMU Series | ±0.2 | 0~rated torque At rated speed |
| BLE2 Series | ±0.2 | |
| BLE Series | ±0.5 % | |
| BLS Series | ±0.2 % | |
| BLH Series | ±0.2 % (at digital setting) ±0.5 % (at analog setting, PWM input setting) |
|
| BLV Series R Type |
±0.01 % | |
Wide Speed Control Range
Brushless motors have a wider speed control range than AC speed control motors.
Unlike AC speed control motors, the torque at low speed is not limited, so brushless motors are suited to applications that require a constant torque from low speed to high speed.
| Product Group | Speed Control Range* | Speed Ratio |
|---|---|---|
| Brushless Motors (For BMU Series) |
80~4000 r/min | 1:50 |
| AC Speed Control Motors | 50 Hz : 90~1400 r/min 60 Hz : 90~1600 r/min |
1:15 1:17 |
- *The speed control range varies depending on the model.
In Addition to Single-Phase 100 VAC/200 VAC System, Three-Phase 200 VAC Voltage System Specifications are Available
Products with AC input are available in voltage specifications of single-phase 100 VAC/200 VAC system and three-phase 200 VAC system, allowing use in major countries around the world.
Products with DC input are also available.
Contributes to Energy Savings
Brushless motors, which incorporate permanent magnets in the rotor, generate little secondary loss from the rotor.
This results in a roughly 26 % reduction in power consumption compared to a three-phase induction motor for inverter control*. This helps the equipment to save energy.
- *When output power is 90 W
Compact yet Powerful
Brushless motors have flat bodies and provide high power due to permanent magnets being used in the rotor. For example, when compared to a three-phase induction motor with a frame size of 90 mm, the overall length is 84.6 mm shorter and the output power is approximately 1.3 times greater.
Brushless motors also contribute to equipment downsizing.
Equipped With Protective Functions and Outputs Alarms
Equipped with various protective functions, such as the overload protective function and the overvoltage protective function. When the protective function is activated, an alarm is output.
Conforms to Global Safety Standards
Each Series is UL/CSA Standards certified, EN Standards compliant, and have the CE Marking.
For Those Who Have Not Decided on a Series
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