Z4 series DC motor

Z4 series DC motors, the prime mover of machinery, are widely used in mill auxiliary of metallurgical industry, metal-cutting machine tool, paper making, printing, textile, printing and dyeing, cement-making as well as plastic extruding machine, etc.

Outline and mounting dimensions of the motors comply with IEC72 Standard, except for the axial distance between the mounting holes (dimension B).

Performance and technical requirements of the motors meet IEC34-1 and DIN57530.

The angular shape of the machine makes good use of space. The use of laminated yokes is suitable for rectifier power supplies, and it can endure both pulsating current and rapid change of current (load change). Pole installation with precise positioning leads to good commutation.

Motors of insulation level F, with reliable insulating construction and impregnating process, ensure stable insulating property and excellent heat dissipation.

The motors possess the features of small size, good performance, light weight, large output, high efficiency and reliability, having achieved the current international advanced level.

Motors can lastingly work under three-phase bridge rectifier and no external smoothing reactor. Motors rated at 160V are powered by single-phase bridge power supply. In that case, a smoothing reactor should be connected to the armature circuit to suppress pulsating current. The inductance is specified in the relevant technical data.

Electrical performance

1. Data listed in the technical data sheet should be employed under the following conditions:

a. Altitude maximum is 1,000m.

b. Cooling air temperature maximum is 40℃.

c. Ambient conditions for motors should be free from acidic, alkaline or other aggressive gases which corrode insulation.

d. Duty: Continuous (S1)

e. Armature and field circuits for motors can be either operated on static eliminator supply or from DC generator.

f. Performances of motors comply with GB631-fundamental technical rules for DC motors.

2. Standard rated voltage: 160V or 440V. 220V, 400V or 660V or other voltage can be derived on request.

3. Rated speed: 3000, 1500, 1000, 750, 600, 500, 400,300 and 200 r/min, totally nine grades.

Decrease armature voltage to make speed regulating under constant torque and lower down field voltage to make speed regulating at constant output.

4. Separate excitation is the basic excitation type of the motors. Nominal field voltage: 180V, other excitation voltages are also acceptable on request.

Forced excitation is allowed with the voltage of less than voltage of less than 500V. When a motor is normally running, its excitation current must not be higher than the rated excitation current.

To assure the reliability of insulation of excitation system, the motor must be protected against self-induction voltages by a release resistor connected in parallel with the field winding when the excitation circuit of the motor is interrupted. At rated field voltage the value of shunt resistor is about seven times field 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 Z4-315, Z4-355, Z4-355, Z4-400 and Z4-450, compensating winding are provided. For frame size Z4-250 and Z4-280, the motors are feasible with a compensating winding too.

6. A marked earthing terminal is provided for the motors.

7. The efficiency listed in the data sheet is for rated output, voltage and speed, and includes excitation losses, excluding that of separate ventilating fans.