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Brake motors

YEJF series electromagnetic brake three phase asynchronous motor

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YEJF series electromagnetic brake three phase asynchronous motor

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Product serial number

YJ-016

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Product description

Parameters

Technical parameter

Shape and installation dimensions

Wiring method

Clearance and Torque Regulation

Common failures and troubleshooting

Sample and video download

Product Profile

YEJF series three-phase asynchronous motor with electromagnetic brake is an electrified brake motor carefully designed according to the requirements of national standard JB/T6465. It consists of a universal (Y2 series) three-phase asynchronous motor with DZMF series electromagnetic brake at the back end. Its power level and installation size are in line with JB/T6456 industry standard and IEC72 international standard.This series of products have obtained ISO 9001 system certification and CCC product certification certification.

Scope of use

This series of motors are suitable for all kinds of transmission machinery which motor needs special braking function. The best braking effect can be obtained by automatic control method. Because the brake motor has no braking moment in air cutting, it is not suitable for lifting machinery and other equipment with gravity sag.

Working principle

The motor and brake parts of YEJF brake motor are powered independently. Without power supply, the motor spindle is in a state of free rotation. Therefore, when the motor is used in the working process, the motor can start directly. When the motor needs to be braked when the power is cut off, the brake will work. When the motor achieves the braking effect, the brake will be cut off (through the control circuit), and the motor spindle will resume free rotation.

Product characteristics

1. The main protection level of the motor is IP44, and the brake part is IP23.

2. The cooling mode of motor is IC411 (self-fan cooling).

3. Motor insulation grade is B and F, brake insulation grade is F.

4. Installation size and power level of the motor fully conform to JB/T6456 industry standard and IEC-72 international standard.

5. 71 is aluminium-shell motor, 80-160 is aluminium-shell or cast-iron-shell motor, 180 is cast-iron-shell motor.

Conditions of use

1. Rated voltage: The standard product is AC380V 50Hz, and the electromagnetic brake is DC24V (or designed according to customer's requirements).

2. Working mode: S1 (continuous working system);

3. The altitude should not exceed 1000mm.

4. Environmental temperature: - 15 ~40 C;

5. When the monthly mean minimum temperature is not higher than 25 C, the monthly average maximum relative humidity is 90%.

1. Air Gap Value of Brakes in Electric Machines of Various Specifications in this Series (Delta)

2. Inspection of air gap

As shown in Figure 1, the distance between the electromagnet 1 and the friction plate 2 is called the air gap (delta). Normally, when the motorleaves the factory, it is adjusted within the initial working air gap value to run for a period of time.After time, the air gap (delta) increases due tonthe wear of friction disc and friction plate. Because the air gap value increases due to the wear of friction disc, the braking effect of brake will be affected. Therefore, a section of motor is used.After time, the size of plug must be selected according to the maximum working air gap, and the size of air gap (delta) must be checked. When inspecting, the plug ruler of selected size can be directly inserted into the air gap (delta), such as The plug entry indicates that the air gap (delta) is too large and must be adjusted.

3. Air Gap AdjustmentAs shown

in Fig. 1, pull out the outer hexagonal screw 6 (DZMF05-20 is three, DZMF40 or more is four), screw two outer hexagonal screw 6 into the disassembly process screw hole of the fixed bushing 5, eject the fixed bushing 5, and then the combination of the friction plate and the friction disc seat is loosened. Three plug rulers are selected according to the initial working air gap value. Inserted into the air gap (delta) marked in the drawing, three plug rulers are evenly distributed at 120 degrees. Fixed bushing 5 is struck in the direction of axle extension with a wooden hammer. Fixed friction disc assembly is fitted with the taper inner hole of the friction disc seat through the fixed bushing 5, and then tightened the outer hexagonal screw 6. When the screw is tightened, the friction disc assembly moves out, and the plug ruler will be loosened and pulled= out. Note that when hammer strikes fixed bushing 5, it must be tightened. Otherwise, when external hexagonal screw 6 is fixed, the frictional disc assembly moves out too much, and the air gap (delta) will become larger. Therefore, we should cooperate well in choosing plug ruler and debugging method. Air gap adjustment can be replaced by similar thickness of iron sheet if there is no standard plug ruler.

NO.	Fault phenomenon	Examination site and method	Solutions
1	Brakes do not absorb severe vibrations and squeaks	(1) As shown in Figure 1, check whether nut 5 is loose or not. (2) Measure whether the air gap (S) exceeds the maximum working air gap value; (3) Measure the resistance of three-phase winding with multimeter. Is it basically average? Is there a break? (4) Check whether the AC three-phase power supply is out of phase with SOOV AC voltage of multimeter; (5) excessive braking moment exceeding rated value; (6) Check whether foreign bodies are stuck on the surface of iron absorption or whether dry grease deposits cause unevenness on the surface; (7) The surface of iron absorption is uneven after long-term use.	(1) Tighten nut 5; (2) If the air gap (S) is too large, it will be adjusted to the Initial working air gap. (3) To repair or replace the magnetic rollers with broken wires; (4) Eliminate problems found; (6) Adjusting the compression length of the brake spring to control the braking moment; (6) Removing foreign bodies and grease scale; (7) Leveling by lathe or surface grinder;
2	Brake fail ure and brake fail ure	(1) Friction disc wear. The working air gap increas- es and the torque decreases. (2) Friction disc damage; (moment inertia Is too large to exceed braking	(1) Re-adjusting air gap（δ）； (2) Replacing new friction discs; (3) Re-selection of motor models
3	Motor heating	(1) Overload. Over the specified current of name- plate. (2) Using frequency converter power supply, the use time in low frequency band is too long; (3) Whether there are cotton wool, yam and paper on the air Inlet and blade of the motor to block up the cooling air source. (4) Check whether the power supply and motor are out of phase.	(1) Reduce the load, control the rated load, of reconsider the selection of motor. (2) External additional fan; (3) Clean up cotton floss and other debris in the ah Inlet of the motor and on the wind blade; (4) Repair.
4	When released manually the rotat ing shaft does not move.	(1) The friction disc is adhered to by oil (from the gearbox or elsewhere). (2) The brake is not used for a long time, and the plane friction disc of the motor end cover is rusty,	(1) Remove the friction disc and wipe it dry before assembling. (2) After disassembly, the rust spots can be removed and reassembled, which will work normally.