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YEJ motor brake

YEJ motor brake

YEJ motor brake Features:
● Compact design of plastic housing.
● Small size.
● It can be installed in the terminal box of the motor.
● It has a protective effect on the reverse peak voltage generated by the switch on the DC side.
● The maximum ambient temperature is 80°C.
Product table
Rated brake voltage
Coil voltage range
U2(U Out)
AC supply voltage
AC Voltage supply
U1(U in)
99V
93-118V
220VAC
198V
182-230V
220VAC
170V
162-198V
380VAC
Technical data
Rectifier type
Full/half wave rectifier
Full/Half-wave Rectifier
Full-wave rectified output voltage
Vdc = Vac/1.1
Half-wave rectified output voltage
Vdc = Vac/2.2
Ambient temperature(℃)
-25℃- 80℃
Input voltage (40-60Hz) Uin=Input Voltage(40-60Hz)

YEJ motor brake
DC side connection switch
When the switch is connected between the rectifier and the brake magnet, the delay response time is short, and the energy of the magnetic field is absorbed by the rectifier. The peak voltage generated when opening and closing the switch has no effect on the rectifier.
When the switch is connected to the DC side of the rectifier, the maximum allowable switching frequency is related to the capacity of the magnet. In order to achieve a higher switching frequency, a varistor can be connected in parallel with the brake or the DC terminal of the rectifier.

The DC disc brake of the YEJ motor brake motor is installed on the end cover of the non-shaft extension end of the motor. When the brake motor is connected to the power source, the brake also works at the same time. Due to the electromagnetic attraction, the electromagnet attracts the armature and compresses the spring, the brake disc is disengaged from the armature end cover, and the motor starts to run. When the power supply is cut off, the YEJ motor brake electromagnet loses its magnetic attraction, and the spring pushes the armature to compress the brake disc. Under the action of the frictional torque, the motor immediately stops running, which is to apply a brake opposite to the original rotation direction to the running motor The torque forces the motor to stop quickly. There are two types of braking methods commonly used in motors: mechanical braking and electrical braking.
1. Mechanical brake control circuit
The method of using mechanical devices to quickly stop the motor after disconnecting the power supply is called mechanical braking. Mechanical braking is divided into two types: power-on braking and power-off braking.

YEJ motor brake
The YEJ motor brake device consists of an electromagnetic operating mechanism and a spring force mechanical brake mechanism. The following figure shows the structure of the power-off brake electromagnetic brake and its control circuit.
working principle:
Turn on the power switch QS and press the start button SB2, the contactor KM coil is energized and self-locked, the main contact is closed, the solenoid YB is energized, the armature is closed, the brake shoe and the brake wheel are separated, and the motor M starts to run . When parking, after pressing the stop button SB1, the contactor KM coil is de-energized, the self-locking contact and the main contact are disconnected, so that the motor and the solenoid YB are de-energized at the same time, the armature is separated from the iron core, and the brake is closed under the action of the spring tension. W hugged the brake wheel tightly, and the motor quickly stopped.

2. Reverse connection brake control circuit
The electrical braking methods used for fast parking include reverse braking and dynamic braking.
Reverse braking relies on changing the phase sequence of the three-phase power supply in the stator windings of the motor to reverse the rotating magnetic field of the motor, thereby generating an electromagnetic torque opposite to the inertial rotation direction of the rotor, so that the motor speed is rapidly reduced, and the motor is braked to close to zero. When rotating speed, cut off the reverse power supply. The speed relay is usually used to detect the zero-crossing point of the speed.

YEJ motor brake

The working principle of YEJ electromagnetic brake motor brake
YEJ electromagnetic brake motor is also called an additional electromagnetic brake type three-phase AC asynchronous brake motor. How does its brake perform braking? Here is a brief introduction to the working principle of the YEJ electromagnetic brake motor brake:
The YEJ additional electromagnetic brake motor consists of an ordinary three-phase asynchronous motor with an electromagnetic brake, which is installed on the non-working shaft extension end. The excitation current of the brake is generally direct current. According to different control requirements, it can be supplied by a separate direct current power supply or by introducing alternating current from the motor terminal, which will become a direct current power supply after rectification.
Brakes can be divided into two types. One is to use the spring force of the brake to generate braking force on the motor rotor when the power is not applied. After the excitation coil is energized, the electromagnetic force will friction between the brake disc and the rotor shaft. The disc is disengaged to eliminate the braking state, which is called power-off braking; the other is that there is no braking torque when the power is not applied, and the shaft can rotate freely, but after the excitation coil is energized, braking force is generated and applied to the shaft Braking torque is called energized braking, and the former is more widely used.

YEJ motor brake

Points to note when applying YEJ electromagnetic brake motor brake:
For the two YEJ motor brake motors, there was no abnormality during the motor test, including the verification of the braking effect of the motor, but the fact that the motor could not start when used by the user. The service personnel arrived at the scene and found that there was a problem with the brake wiring, and the motor was normal after reconnection.
About power failure brake:
Electromagnetic brake is an additional device commonly used in electromagnetic brake motors, and it has two types: power-on braking and power-off braking. The power-on braking method is fast and accurate in positioning. It is used for automatic and intelligent control equipment that requires precise positioning. It has certain limitations in the application. The electromagnetic power-off brake (hereinafter referred to as the brake) is widely used in machine tools, metallurgy, electrical machinery, chemical engineering, construction, Packaging and printing, textiles, automated production lines, and other mechanical transmission systems with positioning and braking requirements are commonly used. In addition to the advantages of flexible control and fast braking speed, power-off braking means that the equipment can be safely braked under unexpected power outages. Ensure the safety of persons and facilities.
Structural advantages and characteristics:
Compact structure, although the axial size of the power-off brake is small, the braking torque is large enough.
The brake with rapid response to power failure uses a spring storage device to form braking torque, and the reset time of the bomb is the braking response time. Long-life brake adopts new friction materials to determine the performance of long-life.

YEJ motor brake

Working principle of braking:
The electromagnetic power-off brake is mainly composed of magnetic yoke with coil, armature, coupling plate, spring, friction disc, gear sleeve and other parts. The spring is installed in the magnetic yoke, and the armature can move in the axial direction. The magnetic yoke is fixed on the base by mounting screws to adjust the gap. After reaching the specified value, the gear sleeve is connected with the transmission shaft through a key, and the outer teeth of the gear sleeve mesh with the inner teeth of the friction disc. When the coil is de-energized, under the action of the spring force, the friction disc and the armature, the base (or the coupling plate) generate friction, and the drive shaft is braked by the gear sleeve. When the coil is energized, under the action of electromagnetic force, The armature is attracted to the yoke, which loosens the friction disc and releases the brake.

YEJ motor brake

Brake working conditions:
The relative humidity of the surrounding air is not more than 85% (20±5℃)
In the surrounding medium, there is no gas or dust that can corrode metals and damage insulation.
Class B insulation is adopted around the brake, and the voltage fluctuation does not exceed +5% and -15% of the rated voltage. Its working mode is the installation control requirement of continuous working system.
When installing, ensure the matching accuracy between the drive shaft and the brake.
The brake must be cleaned before installation, and there must be no oil and dust on the friction surface and inside the brake.
The gear sleeve must be axially fixed.

The monolithic electromagnetic brake is a dry monolithic energized brake. The product has a compact structure, short braking delay time and large braking torque. The biggest advantage: It can be installed horizontally or vertically, and is not affected by the installation angle, effectively eliminating the impact of the motor's axial movement on the higher requirements of the brake air gap. It is suitable for occasions requiring braking or positioning requirements in mechanical transmission systems. Such as precision machinery, printing machinery, packaging machinery, laboratory equipment and office machinery and other transmission systems brake positioning.
Installation and use:
This series of brakes have a universal voltage of DC 24V and a current of less than 2A. When the power is disconnected, the armature and the coil maintain a gap of 0.5 mm. A retaining ring can be set outside the convex surface to control the gap.
Basic type: The coil is fixed on the end surface of the device during installation, and the armature of the basic type is fixed on one side of the rotating end of the device. When the power is off, the armature is separated from the coil, and the armature rotates with the rotating end. When energized, the coil generates a magnetic field to attract the armature, and the rotating end and the armature are immediately stopped.
Type A with flange, convex surface outward:
During installation, the coil is fixed on the end surface of the equipment, and the A-type armature and the guide seat form a part (the guide seat function is used to fix the output shaft with key groove, start and stop synchronously with the shaft, and can move back and forth in the axial direction). When the power is off, the armature is separated from the coil, and the armature rotates with the shaft. When energized, the coil generates a magnetic field to attract the armature, and the shaft and the armature are immediately stopped.
Type B with flange, convex surface inward:
Consistent with the use of Type A, the installation space of the brake is further saved due to the convex surface inward.

YEJ motor brake

Simple calculation principle for selection:
The choice of brake model depends to a large extent on the required braking torque. In addition, factors such as braking moment of inertia, relative speed, braking time, operating frequency and other factors should also be considered. The following are the styling rules recommended by a certain brake manufacturer. Different manufacturers will have some differences, but the principles are similar.
Calculate the required braking torque: T=K×9550×P/n
Among them: T—— required braking torque (N.m)
P——Transmission power (kW)
n——Relative speed when the brake is applied (r/min)
K safety factor (take K>2)
Maintenance and maintenance of brakes:
● After the brake is used for a period of time, due to the wear of the friction parts, it is necessary to readjust the clearance value by adjusting the screw, nut, adjustment sleeve, etc. to make it meet the specified value.
● The friction surface should always be kept clean and free of impurities.
The electromagnetic brake motor is mainly composed of two parts: a motor and an additional DC electromagnetic brake. The motor brake is equipped with a manual release device, which is used to complete the installation and commissioning of the hanging basket and the release of power failure. The motor adopts high-quality aluminum alloy shell, which has the characteristics of small size, light weight, stable and reliable operation, large braking torque, fast braking speed, accurate positioning, and convenient maintenance.

YEJ motor brake

A friction disc and excitation coil made of asbestos wear-resistant material are installed on the back end cover of the motor. When the motor loses power, the friction disc is passed through a compression plate by the brake spring, and is tightly pressed on the machined surface of the motor rear cover, so that the brake disc generates a strong friction torque to achieve the purpose of braking. When the excitation coil is energized, electromagnetic attraction is generated, and the spring compression plate is sucked in, and the compression plate leaves the Mo dinner plate. The friction disc is released and the motor rotates flexibly. Depending on the power of the motor, the coil resistance is between tens to hundreds of ohms.
The DC brake cannot be directly connected to the AC power supply. A winding coil is installed on the brake chuck. The rated voltage of the winding is low-voltage DC voltage. When working, the single-phase AC power supply must be rectified and supplied to the suction cup winding, so a rectifier is also installed in the brake motor junction box.

Date

24 October 2020

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YEJ motor brake

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