How does a brake work?
In order to ensure fast and accurate stops, the system of
the W22 brake motor works as follows: when the motor
is disconnected from the line, the current of the brake coil
is also interrupted, which makes the coil stop actuating.
Then, the springs push the armature towards the motor,
compressing the brake disc between the armature and the
ND-endshield, thus braking the motor.
Figure 1 - Scheme of the brake components.
When Power is applied, the system simultaneously starts
the motor and powers up the brake coil. The armature is
attracted against the frame of the brake coil, overcoming the
pressure of the springs and releasing the brake disc, which
moves in the axial direction away from the friction surface.
Thus, the braking action ceases and the motor is free to
start.
Electromagnet coil power supply
The electromagnet coil is powered by direct current (DC)
which can be supplied by a DC voltage source or bridge
rectifier which converts AC to DC current. The bridge rectifier
consists of diodes and varistors that filter undesirable voltage
spikes and enable fast current shutdown. The direct cur-
rent power supply provides higher speed and reliable brake
operation.
Ideal for applications that require immediate, accurate and safe stops, position control and
energy saving. The W22 brake motor is suitable for many different applications, such as
load elevators, hoists, shears, machining equipment, looms, packaging machines,
conveyors, washing and bottling machines, bending machines, among others.
Compression
Spring
Air gap (S L )
Armature
plate
ND-Endshield
Brake
disc
Brake coil
Figure 2 - Detail of the bridge rectifier inside the terminal box.
If the brake coil is supplied by direct current, it must be
directly connected to the brake terminals.
The alternating current (AC) power supply for the bridge
rectifier can be obtained from an independent source,
or from the motor terminals, provided the motor is not
supplied by frequency inverter. This power supply can be
220/230/240 V, 380/400/415 V, or 440/460/480 V, according
to the features of the bridge rectifier/brake coil assembly.
The electromagnetic coil can be operated continuously
within ± 10% of its rated voltage.
Three-Phase General Purpose Motors BRAKE MOTORS – Three-Phase TEFC - WEG brake motors consist of an induction
motor coupled to a disc brake. Brake is of
sturdy construction with few moving parts
which guarantees long durability and minimum
maintenance.
Inverter Rated:
1000:1 for variable torque
12:1 for constant torque
TEFC - High Efficiency
BRAKE MOTORS – Three-Phase
Three-Phase General Purpose Motors
Frame structure that reduces air dispersion and improves the cooling
Terminal box with greater internal space and easy handling
Solid feet that simplify the motor alignment and installation
Frame providing high mechanical strength and low vibration levels
Optimizations of the braking system
New brake
The friction element of the new
brake provides less wear and
more safety
“Interchangeable with other
global brands”
Guarantee of fast and accurate
stops
System with fewer moving
parts reduces downtime for
maintenance
Manual release lever
Motor shaft may remain free in
emergency situations or when
necessary
Standard torques
The torques are established by frame
so as to provide shorter braking times
Available braking torques (Mk). The braking torque must
be equal to or greater than the motor rated torque. Table 5
contains the main characteristics of the brakes, using the
speed of 100 rpm as reference.
Features that make a difference:
• 1.25 service factor
• NPT Threaded terminal box
• Armature type brake
• Manual Release
• Class F insulation (Impregnation Resin and
Magnet Wire are class H)
• F1 Mounted
• Stainless Steel Nameplate - Laser etched with
high contrast background
• Regreasable ball bearings (Frames 254T and up)
Standard Feature
In order to obtain productivity and high performance, a company must count on reliable equipment,
operating in accordance with its purpose. That is the essence of the W22 brake motor: provide the
production process with synergy and agility.
W22 Brake Motor: new platform, new brake, excellent performance!
Featuring a new braking system, high torque and durability, the W22 brake motor is ideal for equipment that requires fast
stops for safety, accurate positioning and time saving.
The new brake motor introduces new characteristics in the braking system
and platform, which now counts on the same innovative features that make
the W22 line a great success:
If separate power supply to the Brake is required, (Such as on
Motors operating from Variable frequency Controller); 230V to
the Brake module is mandatory, unless motor model contains
“Q” (ex. 00118EP3EBMQ143T). For “Q” models, the input
voltage to the Brake module is 460V AC.
Brake Torques
Frame N.m lb.ft
143/5T 16 12
182/4T 60 44
213/5T 125 92
254/6T 235 173
284/6T 400 295
Brake power supply. When the brake coil is powered by a bridge
rectifier, the rectifier input terminals must be supplied with AC
voltage. The relations between the motor voltage, the type of bridge
rectifier and the brake coil power supply must be in accordance with
table 8.
Mounting: F2, F3 flanges, footless, vertical
Degree of Protection: IP56, IP65, IP66
Frequency: 50Hz
Voltage: 575 V and others
DE bearing seal: W3 Seal, taconite seal, INPRO/SEAL ®
Vibration level: Degree B (according to NEMA MG-1)
Winding thermal protection: thermostat or thermistor
Space heater Cable gland Drip cover Tropicalized internal painting Encoder Stainless steel screws
Cooling method: TEBC – Totally enclosed blower cooled (IC 416) Insulation class: “H” Able to operate with variable frequency Inverter*
Microswitch to monitor the air gap or brake opening
(from frame 182T up)
Brake power supply:
380-415 V
440-480 V
525-575 V
Additional terminal box for frames 254T to 364/5T
How to choose a W22 brake motor
For other configurations, contact WEG.
Define the braking torque. The W22 brake motor line offers
up to two torques per frame:
Rated torque: standard torque supplied;
Determine the motor and the brake: the first step is to
define the environment in which the equipment will be used
so as to select the motor with the best electromechanical
characteristics for the application. The type of brake must
also be checked, informing the power supply and the
required braking torque.
Define the ambient temperature: taking into account the
ambient temperature at which the motor will operate, we can
determine the minimum ideal cooling system for the brake
operation, according to table 3.
Table 3 - Definition of the cooling system according to the motor ambient temperature.
* For this condition, please contact WEG.
For other cooling system configurations, contact WEG.
Specify the degree of protection: the enclosures of
electrical equipment, according to the characteristics and
access conditions of the installation environment, must offer
a certain degree of protection. Thus, equipment to be
installed in a place subject to water jets, for example, must
have an enclosure capable of withstanding such jets under
certain pressures and angles of incidence without water
ingress. Table 4 indicates the minimum cooling system
necessary to ensure the degree of protection.
Degree of
protection
Minimum cooling system of the motor
IP55
No ventilation / Air Over (with fan cover)
Self-ventilated
With or without release lever
IP56/IP65/IP66
Self-ventilated with brake protection cover
Without release lever
W-Easy Maintenance
With or without release lever
Table 4 - Degrees of protection and minimum cooling systems of the motor.
Ambient
temperature
Minimum cooling system of the motor
Up to 40°C No ventilation / W-Easy Maintenance
Up to 50°C Self-Ventilated / Air Over
Up to 60°C Blower cooled
Up to 70°C Blower cooled*
The W22 brake motor is a motor for quite specific applications that demand high safety
and accuracy. Therefore, it is extremely important to take into account some criteria
when choosing such equipment.
For motors from the 315S / M housing, use with frequency inverter requires that measures be taken to prevent current flow through the bearings. Therefore, the starting method of the motors must always be informed in the purchase order. For the use of stock motors with frequency inverters, please consult WEG.
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ABB motors are Swiss brands ABB Group, a Swiss brand, is one of the world's top 500 companies and enjoys a good reputation the world. It has thousands of companies in more than 100 countries and involves many industries, such as manufacturing, processing, consumer goods, public utilities, oil, and gas, etc. Its China branch factory is located in Shanghai. Its two cores are power technology and automation technology. ABB has 23 branches, sales offices in China, and 27 joint ventures and wholly-owned companies, with more than 6,500 employees in China alone. The main business in China: a complete series of power transformers and distribution transformers, high, medium, and low voltage switches, electrical drive systems, and motors.
