Z Series Medium Size Direct Current Motor

General Brief

Z series medium size DC motors are newly products of the works developed with latest technology of design and manufacturing. There are six shaft heights for motor frames ranging from 315-560 mm.

The performance, outline dimensions and technical specifications of the motors conform to the standard of our country (GB) and International Electric Committee (IEC), while the mechanic dimensions tolerance of the motors conform to the standard of International Standard Organization (ISO).

Working conditions:

1. It is allowed to install this series motors in the environment with worse working conditions.

However, proper cooling and protection type should be chosen to keep the cleanness of the motors.

2. The cooling air should not contain acid or alkali material, which is harmful to the insulation and commutating performance of the motors.

3. In case the motors will be applied to marines, tropical and humid areas, or the areas with salt and humid air, please notify before signing contracts.

4. The motors can reach its rated power under the working condition of less than 1 OOOM sea level height and 40℃ ambient temperature.

5. The power source for the motors can be provided by static rectified source or DC generator.

6.  In case the motor is powered by static rectified source, the number of pulse wave should not be less than 6, the peak ripple wave factor not be over 10％ under the rated speed, voltage and load current.

Type description:

As the frame is of angular thin steel laminations structure, the motor is small in volume, light in weight and can be powered by silicon controlled rectified source. Meanwhile it has good commutating performance in case sudden change of load current occurs. Insulation treatment of VPI applied on the integral stator and rotor makes the windings good in anti-humidity performance, mechanical strength and insulation thermal conductivity. The armature core made up with silicon steel laminations has good magnetic conductivity. Rolling bearings with operating oiling construction are adopted. The motor insulation is class F.

The mounting of the motors conform to Symbols for Types of Construction and Mounting Arrangements of Rotating Electrical Machinery' specified in GB 997 and IEC 34-7.

Bracket bearing, foot mounting with one cylindrical shaft extension

Bracket bearing, foot mounting with two cylindrical shaft extensions

IP 23 and IP 44 is adopted for the motors' protection of this series, which conform to the standard of "Classification of Degrees of Protection Provided by Enclosures for Rotating Machines' specified in GB 4942 and IEC B4-5.ICO8, ICI 7, ICB7 and ICW 37A86 is adopted for the cooling of this series motors, which conform to the standard of Methods of Cooling Rotating Machinery' specified in GB 199S and IEC S4-6. Other types of protection and cooling required by customers can be negotiated. The standard cooling air outlet locates on the side of driving end, (non commutator end).

Products performance:

1.  Continuous working system (S1) is applied.

2. The standard rated voltage of this series motors are 220V, 380Vt 440Vt 550V and 660V. The voltage beyond above scope can be negotiated when placing orders.

3. Separate excitation is the basic excitation type of this series motors. Four terminals of the excitation winding are divided into two groups. In case the two groups are in series or parallel connection. the excitation voltage is 220V or 100V respectively. Excitation voltage beyond the scope can be negotiated.

Forced excitation is allowed with the voltage of less than 500V. During forced excitation I the transient excitation current can exceed the rated excitation current slightly until the excitation current gets stabilized.

4. Short time over-load capability:

The DC motors (class A) can sustain the short time (1 min) overload specified in the following list: 

The DC motors (class B) can sustain the short time (1 min) overload specified in the following list:

The data in brackets are applied in case the basic speed of the motors is equal to or greater than the speed specified in the following list:

The occasionally used short time overload capability refers to the motors' capability of sustaining continuous overload within 1 minute in emergent or unusual cases The transient switching device of breaker is suggested to be rectified according to such capability.

The often used short time over-load capability as a part of normal operating period refers to the motors' capability of sustaining overload repeatedly.

After short time overload operation. Light load operation is necessary to restrict the load root-mean-square of the whole load period within its continuous rating.

The DC motors (Class B) can sustain following continuous load:

(1) Under the rated armature voltage and rated speed the motor can be continuously operated with 115％ overload. In this case, temperature rise will be relatively higher, and the other performance may be different from those under specified ratings.

(2) Soon after continuous operation under rated armature voltage and rated speed. the motor can be operated with 125％ overload for two hours. In this case, temperature rise will not exceed the specified value, while the other performance may be different from those under specified ratings.

Under lower overload, longer time overload is allowed. For the motors (class B). the occasionally used overload times is 2.5 times (under the rated speed) within 15 sec. (please consult with the manufacturer in detail)

5. Speed adjustment.

No speed adjustment is specified for this series motors. Any special requirements in this field by customers can be discussed.

6. Current variation:

The allowable current variation (di/dt) of this series motors under all speeds and loads is 200 times of the rated current per second.

7. Noise and vibration:

The noise level of this series motors conform to the specifications stipulated in ‘Noise measuring Method for Electric Machines of GB2806 and Standard of Noise Level for Electric Machines' of IEC34-9.

Vibration of this series motors conform to the specifications stipulated in vibration Measuring Method for Electric Machines of GB2807 and Vibration Measuring Method and Limit for Electric Machines of IEC34-14.

Capacity choosing:

Class A: DC motors

Please refer to the technical data list, Customers can choose motor type and specifications according to the required capacity, rotating speed, voltage and etc.

Class B: DC motors

Except the rated output of the motors, which is lower than that of class A motors with same shaft height and foot axial length, the other technical data are basically the same as those of class A motors. Should the specification of class B motor be given, one can use the specification list for class A motors to choose the preliminary type of class B. First of all, the rated power of class B motor shall be enlarged by 25%, according to which a corresponding type and specification can be selected out from the specification list for class A. The "A” in the symbol of the selected type,

However, shall be replaced with "B" and the capacity shall be replaced with the non-enlarged power (that means with the original capacity of the class B). Final specifications and data can be discussed between customers and manufacturer.

For example:

Motor required by customer:

Class B motor of 96kW 220V 185r/min

Power enlarged by 25%:

120kW 220V 185r/min

Corresponding type in the specification list for class A:

Z450-2A (118kW 220V 179r/min)

Type transformed from class A to class B:

Z450-2B (approximate 96kW 220V 185r/min)

The motor of this type can basically meet the customer’s requirements.

Output-speed conversion (for motors of class A):

Except the five voltages and corresponding outputs and speeds specified in the technical data list, the other voltage grades and their corresponding outputs and speeds can be derived from motors of any specifications. (However, it is not allowed to exceed the allowable maximum voltage of such specification).

Customized frame size/power

Materiel of frame: Fabricated in welded steel plate frame

Shaft: Special dimensions, double shaft end, tapered, hollow as per request

Service Factor: 1.0 or above

Insulation Class: F (155℃), H (180℃)

Ambient temperature:  40 °C (on request)

Altitude: ≤1000M (on request)

Bearing type: Roller/Ball/Sleeve bearing

Bearing: SKF, FAG brand

Encoder

Speed regulator

Space heaters

Thermostats RTD

Thermal protection PTC

Temperature detector PT100

NDE or both DE and NDE bearing are electrically insulated

Cooling: IC06, IC17, IC37, ICW37A86