Renesas H8S/2635 Manual Pagina 11

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3. Brushless DC motors.
3.1. Overview.
A brushless DC motors, very often denoted by shortcut BLDC (BrushLess Direct Current), are
popular synchronous electric motors widely used in industry, especially in Appliances,
Automotive, Aerospace, Consumer, Medical, Industrial Automation Equipment and
Instrumentation. Characteristic property of this motor kind is that instead of brushes for
commutation it uses electronically-controlled commutated system. Brushless motors have
several advantages, and some of them are:
- good speed versus torque characteristic
- high dynamic response
- high efficiency
- long operating life
- silent during operation
- high speed
- high torque versus the size of the motor
Fig. 3.1-1. REO-20 brushless motor from Maxon.
A very good confirmation of all above features is already mentioned at the beginning of this
document fact that brushless motors were sent to Mars on board two rovers: Spirit and
Opportunity.
3.2. Description.
Generally we can distinguish two types of brushless motors: trapezoidal and sine wave. First one
is really a brushless DC servo. Second kind has close similarity to the AC synchronous motors.
Later in this section I'll shortly show the main differences between these two types of motors.
Now,  look inside and find out how the brushless motors are build.
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