Visible, dc thoughts have excellent authorized functions, its mechanical characteristics and speed
characteristics are parallel lines, this is the characteristics of all kinds of switch electric
thoughts have not. In addition, in fact, permanent magnetic iron remover. Dc current idea and
starting torque, high efficiency, speed control, good static characteristic features such as easily.
Good duty characteristics make dc thought for a long time before the 70 s, in the situation of speed
regulation, duty supplications, nearly became a unique selection. However, direct current (dc)
thought the authority of the fluff, the field winding on the stator attacks the main magnetic field,
the large dc power idea often also equipped with commutating ac electric motor parts
pole, in order to improve of the reversing of the motor function. Dc motor armature winding and been
planted on the rotor commutator, dc power supply through the brush and commutator will direct current
to the armature winding translates into alternating current in the armature winding, namely
mechanical current commutation. Tumultuous authority limit the dc thought to further reduce the
volume and weight, is double brush and commutator of the sliding contact caused by mechanical wear
and spark, the direct current idea obstacle, the more trustworthy authenticity is low, life is short,
cherish the maintenance of large amount of doing things.
Commutation spark both the commutator of electric corrosion caused by nuisance source, or a radio will be harmless influence on the surrounding electrical equipment. Motor capacity, rotational speed is higher, the greater the subject becomes more important. So, in fact, permanent magnetic chuck. Ordinary direct current thoughts of brush and commutator limits the thoughts to burning with high speed, large capacity, depression and goods. On the switch power grid, people still usually manipulated exchange asynchronous electrical idea to drag xing machinery. Simple exchange asynchronous electrical thought has no authority, trustworthy real and long service life, low capital, cherish the simple maintenance. Compared with direct current (dc) idea, however, its speed control function is poor, small starting torque,
overload talent and low efficiency. Carnegie-give must be the onset of a rotating magnetic field from
the grid reactive power, so the power status is low, especially when the light load, which adds lines
and large power consumption. Permanent, since you know that a strong permanent magnet. Without beg
speed control of the situation, such as fan, water pump, the common machine tool drive, asynchronous
electric thought according to a leading fame, of course, this type of drag, visible in a large number
of energy wastage. Domain before the electric drive, rarely color synchronous electric thoughts,
learn to permanent magnetic iron remover. Its main cause motor fan is synchronous
electrical thought cannot under grid voltage starting, movement of the rotor pole under the effect of
rotating magnetic field, uniform torque is zero. They are also great frequency conversion power can
solve the starting and speed control of synchronous motor was thought subject, but in the 70 s,
variable frequency power supply of equipment are to think about. So, before the domain of electric
drive, using synchronous motor was thought as the original thoughts is seldom seen. In high power
within the boundaries, has no intention of occasional synchronous electric thoughts running example,
but it is often used to improve power factor of power grid enterprises.
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