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| ONKYO PX-100M |
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| 500,000yen(1981 release) |
The high-class linear motor system which aimed at
the radical modification of a rotation nakedness property aiming at the ideal of
a phone motor.
PX-100M has adopted the guided type linear motor which
carries out the perimeter direct drive of the turntable, and has realized the
rotation precision which was very excellent. Moreover, a rotor is a non-magnetic
pole, there is no cocking event in accordance with a magnetic pole pushing and
pulling in a motion of a rotor, and the smooth rotation property is ideally
secured also from the principle of operation as a guided type motor with the
continuous thrust given from a stator.
Although a nakedness property is
wonderful and a servo circuitry is originally needlessness in PX-100M, since it
has few transition members partially, the temperature characteristic of the
lubricating oil between a shaft/bearing etc. has applied the necessary minimum
servo.
If an electric current is first sent through a coil, a magnetic
field will occur, and an eddy current generates the rotation principle of a
linear motor in the conductor in a magnetic field. Since the magnetic flux which
cuts an overcurrent will change if this magnetic field is moved to the hand of
cut, a disc is guided in the orientation which a magnetic field moves. In order
for what is necessary to be just to add the sine wave which had the 90-degree
phase difference for moving this magnetic field and to improve efficiency in
fact, the 90-degree phase difference was given and what pole is also piled up.
Furthermore, in order to raise the torque of a linear motor, it is made to
counter focusing on a stator and a rotor, and magnetic flux is made to act
effectively.
In the case of PX-100M, by arranging symmetrically 4 blocks of stators made to counter focusing on a rotor focusing on a shaft, torque
unevenness was canceled completely and the smooth rotation is realized.
10kg of self-weights, inertial-mass 2000kg-cm2, and a deer have also adopted
the heavy weight class turntable of pure-copper shaving appearance, and
20mm of diameters of a shaft, and 94mm in length a very thick and a high-rigidity
stainless steel shaft as a turntable.
Conductivity begins to shave a good pure copper ideal as a rotor of a linear
motor, comes out, and molds,With specific gravity 8.9, since it was large,
it was made to the compact, it began to delete from a Naked, and for the
の reason, the turntable and the rotor were finished by one and the merit
with a securable precision of the rotor moreover pinched by the coil has
been obtained. Moreover, deadning material is stuck on a turntable rear
view, and the resonance of the turntable is pressed down.
Moreover, the ethylene system resin is used for the Tungalloy ball
which has a hardness higher than any metals in the lower end of a shaft, and a
thrust seat, it fills with Takani promotion-to-a-responsible-post special oil
between a shaft and a ball, and it is aiming at the improvement in wear
resistance and S/N.
In order to obtain a constant-speed rotation
quickly, the high torque DC motor and driving circuit which operate only to a
ramp-up period are carried.
After molding the aluminum casting of one
into it in order to obtain a high rigidity in a cabinet, the precision
manipulation by milling cutter manipulation has been performed further.
Furthermore, about an arm base portion, the damping alloys of an aluminum-Zn
system are used on material, and consideration of putting this between a cabinet
and binding it tight is carried out.
Transparent amorphous polyolefin
was finished by center injection molding, it is uniform and the turntable sheet
excellent in the thickness precision is adopted. The unnecessary vibration which
originates in a failure of the physical properties of a turntable side or
adhesion by this is eliminated.
The book jacket made from acrylics is
attached.
The arm base corresponding to a long arm was an option.
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| Form |
Linear motor system |
| Motor |
The main motor: Outer rotor DD scheme guided
type linear motor
Auxiliary motor: High torque DC motor |
| Turntable |
Tough pitch pure-copper block shaving appearance, 33cm of diameters of
a maxima
10kg of self-weights,
inertial-mass 2000kg-cm2 |
| Control system |
Quartz PLL control |
| Wow and flutter |
0.005% |
| Rotational frequency |
33 1/3, 45 or 78rpm |
| S/N |
78dB or more (DIN-B, limit of measurement)
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| Startup property |
It is a convention rotation (startup booster
using) at 1/2 round. |
| Braking method |
Plunger drive mechanical type
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| Conformity arm effective length |
Main-unit arm base: 229-283mm
At the
time of an option arm base using: 235-312mm |
| Power consumption |
55W |
| Dimensions |
Width 560x height 206x depth of 374mm
(book-jacket included) |
| Weight |
40kg |
| Option |
The arm base for long arms AB-100 (\62,000)
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