This series motor used polygon structure so that the using rate of the stator’s inner space is vary high.The magnet yoke is laminated style,suitable for silicon controlled commutate power supply,and it can edure pulsating current and rapid change of current (load change).Magnetic poles are fixed by precise orientation.All the motors of system are with compensate winding,so the reverse performance is very well. The insulation class of the motor is F,using of reliable insulation structure and nonmenstruum vacuum pressure impregnated,guaranteeing the stable performance of insulation and good heat dissipation.

c)The short time overload capacity seldom used means happens infrequency or only at the urgency,the motor working exceed the continuous rated overload capacity,we suggest you adjust the instantaneous open/close decice of the switch according to the short time overload capacity seldom using.
The short time overload capacity seldom constantly used means it＇s an part of the normal working period,the motor endure the continuous rated overload capacity again and again.After working at shor time overload,it must working light load to make the overload period＇s overload root-mean-square less than its continuous ration.
d)Second kind DC motor(B)can endure the following continuous load; Working continuous within the rated voltage and rotate speed with 115% rated power overload,the temperature is higher when at this overload, other features maybe different from working at the rated condition.
Within the rated voltage and rotate speed,after running at the rated overload, working at the 125% rated power for two hours,the temperature rise can＇t overrun the regulated numerical value other features maybe different from working at the rated condition.
e)Second kind DC motor(B),at the rated rotate speed,the overload can reach 2.5 times no longer than 15s only used once in a while.
5.The change rate of current
Under all rotate speed and load,the change rate of current(di/dt)that the motor can endure is 250 times rated current.
6.Libration and noise
a)The libration of the motor accords with GB10068《Measurement evaluation and limits of the vibration severity of rotating electrical machines which the shaft center height is 56mm and above》center standard＇s regulation.
b)The noise of the motor accords with GB10069.3《Measurement of airborne noise emitted by rotating electrcal machinery and noise limits》.
7.The efficiencies listed in the data sheet are for rated output, voltage and speed,and include excitation loss.

The chice of the motors＇capacity
1.First kind(A):Ordinary industrial DC motor The technical data of this kind of motor please see the technical data table. The buyer can decide the capacity、voltage、running speed and the method of cooling of the motor at the buyer＇s optin.
2.Second kind(B):Metal rolling mill DC motor The output power of this kind of motor is about 20% lower than kind(A),the detail numerical value can be negotiated by the user and the manufacture.
3.Exclude the specification of technical data in the table,manufacturer can derive other specification at the requirement of the user.

1.The methods and defend class of the motor
a)The method of cooling of the motor is separately-cooled,according to the GB/T1993《Method of cooling of rotating electrical machinery》,there are IC06、IC17、IC37、IC86W. Standard entrance of cooling air is at the end of the main transmission(not the commutator side).The defend class of the motor can be divided into IP23 and IP44 according to the GB/T4942.1《the crust defend class of rotating edectrical machinery(IP code)》. If the user needs other method of cooling and defend class, it can be negotiated.
b)The relation between the method of cooling and the defend class of the motor please see Table 1
table 1

c)The cooling wind、wind pressure、cooling water flux、motor power see Table 2.
table 2