Description
Large Size Z, ZFQZ, Z4 DC Motor of Mill Auxiliary,
Hoisting, Crane, Elevator, Excavator, Steel Mill, Plastic Extruding
Machine DC Motor is newly developed products of our works.
The products are found wide use for prime mover in various, such as
mill auxiliary in metallurgical industry, metal cutting
machine-tool, paper making, print, textile, printing and dyeing,
cement-making, plastic extruding machine, etc.
Outline and mounting dimensions of the motors comply with
IEC*2 Standard, except for the axial distance between the mounting
holes (dimension B).
Performance and technical requirements of the motors can be
checked in accordance with IEC***1 Standard of the International
Electro technical Commission, or DIN****0 Norm of the Deutsche
Industries-Norm.
The motors are class F insulated, with reliable insulating
construction and impregnating process, ensuring stable dielectric
performance and excellent heat dissipation.
The motors possess the features of small size, good
performance, light weight, large output, high efficiency and
reliability, being able to match the current international advanced
level.
The motors can be lastingly operated form fully controlled
three-phase bridge without a smoothing reactor. Motors for **0V may
be operated on single-phase bridge thyristor. In that case, a
smoothing reactor, whose inductance is specified in the relevant
technical date, should be inserted in the armature circuit to
suppress ripple current.
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1. Data listed in the technical data sheet should be employed
under the following conditions;
a. Altitude above sea level maximal 1,**0m;
b. Cooling air temperature maximal *0oC;
c. Ambient conditions for motors should be free from acidic,
alkali fumes or other aggressive gases which corrode
insulation.
d. Duty: Continuous (SI);
e. Armature and field circuits for motors may be either
operated on static thyrisier controlled supplies, or from d-c
generator;
f. Performances of motors all comply with State Standard
GB**5. Fundamental technical rules for electrical
machines.
2. Standard rated voltage: **0V or **0V, Values
for  **0V, **0V, and **0V or other voltage may
be derived on request.
3. Rated speed:Â ***0, ***0, ***0, **0, **0, **0, **0, **0 and
**0 r/min, totally nine grades. Decrease armature voltage to make
speed regulating under constant torque, lowering
down field voltage to make speed regulating at
constant output. Speed regulating range: see technical
date. The torque can be remained constant by
reducing speed via armature voltage weakening below
raced value. It is stipulated that armature speed range can
be down to the lowest *0 r/min at constant torque and stable
running.
4. Separate excitation is the basic excitation type of the
motors. Nominal field voltage: **0V.
Other excitation voltages are also acceptable on request.
Forced excitation is allowed with the voltage of less than
**0V. When a motor is normally running, its excitation
current must not be higher than rated excitation current. To
assure the reliability of insulation of excitation system,
the motor must be protected against self induced voltages by
a release resistor connected in parallel with the excitation
circuit of the motor is interrupted. At rated field voltage
the value of shunt resistor is about seven times filed
winding resistance (cold state). While the field voltage
is higher than nominal voltage, the value of
shunt resistance may be lower than seven times
field resistance, otherwise higher than seven times.
5. For frame size Z****5, Z****5, Z****0 and
Z****0, compensating windings are provided. For
frame size Z****0 and Z****0 the motors are feasible
with a compensating winding too.
6. A marked earthing terminal is provided forth motors.
7. The efficiencies listed in the date sheet are for
rated output, voltage and speed, and include
excitation lose, excluding that of separate ventilating fans
