WZ,WZW series disc eddy current brakeDetailed product description：

Disc eddy current brake is currently an advanced simulation loading equipment in China, mainly used to simulate the output performance of various power devices. The WZ series mainly consists of induction disks, armatures, and excitation parts. After the excitation winding is energized, a closed magnetic flux is generated. When the induction disk (toothed) rotates, the air gap magnetic density undergoes periodic changes, inducing eddy currents. Due to the coupling effect between the "eddy currents" and the magnetic field, a braking torque (slip) is generated on the rotor, thereby achieving the purpose of loading the power equipment. This machine is suitable for performance testing of small and medium-sized power motors, automobiles, internal combustion engines, gas turbines, water turbines, engineering machinery, forestry, mining, petroleum drilling and production machinery, and can also be used as a power absorbing device for other power equipment.
Performance Characteristics
Simple structure, easy operation and maintenance;
High braking torque, high testing accuracy, and stable operation;
Small moment of inertia, fast dynamic response;
Paired with the measurement and control system, it can achieve automated operation.
1、 Working and environmental conditions for product use
The eddy current brake adopts a specialized matching stable current power supply
The cooling water is ordinary fresh water with a water pressure of 0.02-0.1Mpa. The specific water flow rate is shown in Figure 9
Environmental temperature: -10 ℃ to 40 ℃
Relative humidity: 20-90% RH
2、 Main technical parameters
1. The main performance indicators are shown in Tables 1 and 2
2. Cooling water pressure: 0.02-0.1Mpa. Adjust the water pressure according to the outlet temperature. When the outlet temperature increases, increase the water pressure appropriately to lower the outlet temperature.
Cooling water flow rate: The amount of cooling water depends on the temperature difference between the inlet and outlet water and the magnitude of the absorbed power, as shown in Figure 9
3. Electric eddy current brake outlet temperature ≤ 55 ℃
Note: WZW-P type is a low-speed, high torque series eddy current brake

Table 1 Main Performance Indicators of WZ-P Series Eddy Current Brake

Model number	rated power kW	rated torque Nm	maximum speed r/min	rated speed r/min	moment of inertia kgm2
WZ-25P	six	twenty-five	twelve thousand	2000~2800	zero point zero zero five
WZ-50P	ten	fifty	twelve thousand	2000~2800	zero point zero zero five
WZ-70P	sixteen	seventy	twelve thousand	2000~2800	zero point zero zero six
WZ-120P	twenty-five	one hundred and twenty	ten thousand	2000~2800	zero point zero one
WZ-160P	forty	one hundred and sixty	nine thousand	2000~2800	zero point zero two five
WZ-250P	sixty-three	two hundred and fifty	eight thousand	2000~2800	zero point zero five
WZ-400P	one hundred	four hundred	seven thousand	2000~2800	zero point one four
WZ-600P	one hundred and sixty	six hundred	six thousand and five hundred	2000~2800	zero point four five
WZ-1100P	two hundred and fifty	one thousand and one hundred	five thousand	2000~2800	one point two five
WZ-1600P	three hundred	one thousand and six hundred	five thousand	2000~2800	two point six
WZ-2600P	four hundred	two thousand and six hundred	four thousand and five hundred	2000~2800	three point four
WZ-3300P	five hundred and sixty	three thousand and three hundred	four thousand and five hundred	2000~2800	four point two
WZ-4000P	six hundred and thirty	four thousand	four thousand	2000~2800	five point three

Table 2 Main Performance Indicators of WZW-P Series Eddy Current Brake

Model number	rated power kW	rated torque Nm	maximum speed r/min	rated speed r/min
WZW-250P	sixty-three	two hundred and fifty	six thousand	1000~1600
WZW-400P	one hundred	four hundred	five thousand and three hundred	1000~1600
WZW-600P	one hundred and sixty	six hundred	four thousand and eight hundred	1000~1600
WZW-1200P	two hundred and fifty	one thousand and two hundred	four thousand and one hundred	1000~1600
WZW-1700P	three hundred	one thousand and seven hundred	four thousand	1000~1600
WZW-2600P	four hundred	two thousand and six hundred	three thousand and two hundred	1000~1600
WZW-3300P	five hundred and sixty	three thousand and three hundred	three thousand	1000~1600
WZW-4000P	six hundred and thirty	four thousand	two thousand and five hundred	1000~1600

The characteristic curves of eddy current brake are shown in Figure 1, Figure 2, and Figure 3
Figures 1 and 2 respectively show the power absorption range and torque range of the WZ-P series eddy current brake, while Figure 3 shows the torque range of the WZW-P series eddy current brake. Whenever the characteristic testing point of the tested power machinery is located in this area, this eddy current can be used for testing. Users must pay attention to this when purchasing.

3、 Structure and principle
The eddy current brake is mainly composed of a rotating part (induction disk), a housing (armature and excitation part), and its structural diagram is shown in Figure 5.  

According to the structural diagram, when the excitation coil assembled coaxially with the rotor is subjected to direct current, the magnetic flux generated by it forms a closed loop through the armature body, eddy current ring, air gap, and rotor. Due to the uniform distribution of teeth and grooves on the outer surface of the rotor, a magnetic field with alternating density is generated on the air gap and the surface of the armature body or vortex ring. Therefore, when the rotor is dragged to rotate, the magnetic field at any point on the inner surface of the armature body and vortex ring changes, inducing a "vortex". Due to the coupling effect of the "vortex" and the magnetic field, a braking torque is generated on the rotor. Since the armature body is fixed to the base plate through the machine, the rotor cannot drive the armature body to rotate. The power output of the power machinery is converted into equivalent heat generated by the "vortex" on the armature body and vortex ring, which is continuously consumed by the cooling water entering the cooling water tank of the armature body and vortex ring and the vortex brake itself.
Corresponding to each constant current in the excitation coil, the eddy current brake exhibits a stable braking characteristic curve where torque depends on the rotational speed. By changing the magnitude of the excitation current, the braking torque can be altered.  

4、 Transportation and storage
The product should be protected from rain, inversion, and impact during transportation. The product should be stored in a dry and ventilated warehouse free of corrosive gases, and any accumulated water in the cooling system must be drained.  

5、 Cooling water requirements
Cooling water is an important safety guarantee for the operation of eddy current brakes. During installation, it is necessary to connect water pipes of the specified size to the inlet and outlet of the brake, and test the water supply system to check for leaks and whether the water pressure and flow rate meet the specified requirements. It is best to add a water pressure gauge at the inlet. (See Figure 6 for cooling water flow rate)
Note: The cooling water quantity Q depends on the temperature difference # t between the inlet and outlet water and the magnitude of the absorbed power P. The water consumption for each operating condition listed in the figure is the theoretical calculation when the outlet temperature is up to 55 ℃. To reduce the outlet temperature, the actual water quantity should be increased.  
Figure 6 Cooling Water Diagram for WZ-P and WZW-P Eddy Current Brakes
Cooling water can be directly cooled by tap water or supplied by a circulating water tank. When using a circulating water tank, the cooling of the cooling water should be considered, and the inlet water temperature should be ≤ 25 ℃. The cooling water should use pure tap water and should not contain corrosive substances such as sand, salt, acid, alkali, etc. to prevent the formation of scale. Due to differences in water quality in different regions, users can make their own judgments and choices, and take measures to prevent the formation of scale. Especially in hard water areas, measures must be taken, otherwise the cooling water channel of the eddy current brake will soon be blocked, making the eddy current brake unable to function properly. To ensure the normal use of the eddy current brake, it is recommended to add G1 scale inhibitor to the cooling water to prevent scaling in the cooling chamber after long-term use of the eddy current brake, which will affect the cooling effect and cause damage to the eddy current brake. A filter screen should be installed at the inlet of the eddy current brake to prevent foreign objects from entering.