Allied Motion unveils EnduraMax 75i integrated brushless servomotor-drive

Allied Motion’s (www.alliedmotion.com) has launched its EnduraMax 75i integrated brushless servomotor-drive, which combines an integrated all-digital drive, a 4096 count magnetic encoder and a high power density 75 mm brushless DC motor.

This feature-rich integrated motor-drive comes with both +/-10VDC or four to 20 mA command inputs. It can also be controlled through optional Modbus or CANopen, enabling flexibility with system interfacing. EnduraMax 75i motor-drive is offered in three frame lengths as well as in voltages of 48, 24 and 12VDC for up to 1Nm continuous rated torque and up to 39000 rpm speeds.

The neatly packaged solution for speed, torque and/or position control can be used as an alternative for similar sized brushed DC servo motors with longer service life, much higher dynamic performance, quieter operation and reduced maintenance.

The EnduraMax 75i’s set up for motor tuning, position loop or velocity and current is made straightforward with its integrated RS232 communications port as well as the supplied PC-based IN Control HMI software. Suitable for direct position indexing, the port can also be utilized for indexing through optional Modbus or CANopen. It is complemented by six programmable inputs and three outputs for drive fault, limited switches, drive enable and others.

EnduraMax 75i provides full drive electronics protection over short circuit, voltage and reverse voltage with Class F (155c) and I2T rated motor windings. The durable and robust anodized motor and drive housing features IP50 protection with independent D-type connectors and heavy duty bearings for encoder, motor power and I/O, and with a third connector for its optional fieldbus interface.

Brushless dc motors

A brushless dc (BLDC) motor is essentially a dc motor without the mechanical commutation of the brushed dc motor. BLDC motors are powered by direct current and have electronic commutation systems instead of the mechanical brushes and commutators used in brushed dc motors.

All dc motors generate a magnetic field, either via electromagnetic windings or permanent magnets. An armature, which is often a coil of wires, is placed between the north and south poles of a magnet. When current flows through the armature, the field produced by the armature interacts with the magnetic field from the magnets and eventually generates a torque and thereby motion.

For motion control applications, the most common dc motor types are the basic brushed dc motor, brushless motors, and permanent magnet motors.

In a brushed dc motor, the magnet acts as the stator. The armature is integrated onto the rotor and a commutator switches the current flow. The commutator’s function is to transfer current from a fixed point to the rotating shaft. Brushed dc motors generate torque straight from the dc power supplied to the motor by using internal commutation, fixed permanent magnets, and rotating electromagnets.

Brushed dc motors have the advantage of generally low initial cost and simple control of the motor speed. However, there are some drawbacks. At certain periods during the dc motor rotation, the commutator must reverse the current, causing reduced motor life due to arcing and friction. Consequently, brushed dc motors require more maintenance such as frequently replacing the springs and brushes which carry the electrical current, as well as replacing or cleaning the commutator. These components are important for transferring electrical power from outside the motor to the spinning coil windings of the rotor inside the motor.

BLDC motors, on the other hand, do away with mechanical commutation in favor of electronic commutation, which eliminates the mechanical wear and tear involved with brushed dc motors. In BLDC motors, the permanent magnet is housed in the rotor and the coils are placed in the stator. The coil windings produce a rotating magnetic field because they’re separated from each other electrically, which enables them to be turned on and off. The BLDC’s commutator does not bring the current to the rotor. Instead, the rotor’s permanent magnet field trails the rotating stator field, producing the rotor field.

For successful commutation, it’s important to have precise rotor position data, which is often achieved via magnetic sensing with a Hall Effect sensor, which also allows for tracking of speed and torque.

BLDC motors have quite a few advantages over their brushed counterparts. Compared to brushed dc motors, BLDC motors are more efficient due mainly to the elimination of the friction from the brushes. They’re also more reliable and typically have longer life spans as well. Getting rid of the brushes also means a decrease in EMI (electromagnetic interference) noise and no sparking from the brushes making contact with the commutator.

Some servomotor systems use brushless dc motors instead of other types of motors (either a brushed dc motor or an ac motor such as an induction motor.)

BLDC motors are used in everything from low-power applications such as consumer products to high power applications in electric vehicles and industrial equipment.

BEI Kimco’s Brushless DC Motor survives high pressures, temperatures

BEI Kimco Magnetics (www.beikimco.com), a subsidiary of Custom Sensors & Technologies (CST), Inc., has met the demanding Brushless DC Motor requirements employed in a Down Hole Oil Exploration application.

The product’s design should feature a motor that delivers 62 in lbs (7.0 Nm) of peak torque and 44 in lbs (five Nm) at 2000 rpm on a continuous basis, while surviving pressures of 30,000 PSI and ambient temperatures around 200 degrees. The product should also feature Hall effect sensors for commutation.

BEI Kimco’s Model DII36-125-000A, which comes with a motor measuring 12.5 inches in overall length and 3.6 inches in diameter, met these requirements for a robust and highly reliable design. DII36-125-000A’s high energy samarium cobalt magnets allowed it to ensure high efficiency operations, offer improved corrosion resistance while surviving extreme temperatures. Its advanced cable strain relief system and proprietary hall sensor support structure helped it achieve exceptional reliability under extreme conditions. Meanwhile, the product’s housing design compensated high pressures by allowing the motor to be filled with oil.

“Over the past few years BEI has developed a reputation for highly reliable motor solutions,” said Walter Smith, Senior Applications Engineer/Project Manager for Motors at BEI Kimco.

“We are constantly designing products to meet the unique needs of each individual application. Our customers have come to rely on this expertise in a wide range of industries.”

The company’s products have been successfully utilized in numerous applications, such as in Medical, Industrial as well as in Military and Aerospace applications. Its ability to deliver high performance solutions designed to meet the specific needs of the customer has enabled the company to fulfill various challenging requirements.

Roboteq’s HBL2350 drives two brushless DC motors

Roboteq (www.roboteq.com) has unveiled an all-new smart controller that can simultaneously drive two brushless DC motors each about 50V and 75A — the HBL2350.

The first in the group of high current, dual channel brushless motor controllers, HBL2350 can be utilized to control automatic guided vehicles, two-wheel driven small electric vehicles, balancing scooters and other applications that require high power brushless motors.

The controller receives commands either through an analog pedal or a joystick. Its standard R/C radio allows for easy robotic applications by means of remote control through USB or RS232 interface.

The controller can execute over 50,000 basic instructions in 1s through an integrated basic language interpreter. This feature is particularly helpful for adding custom functions through scripts without needing an external PLC or microcomputer.

The motors can operate in an open or closed loop position with an update rate of one kHz. Meanwhile, optical encoders can be used to measure the speed and travelled distance with high accuracy. The controller’s smart current sensing capability narrows down the highest power output to 75A under all load forms.

The controller can also hold up to 11 analogue inputs, six pulse and 19 digital and deliver up to eight 1A digital outputs, which can be utilized for activating brakes, valves, lights and other instruments. Housed in a strong aluminum case, the controller measures 228 mm x 140 mm x 40 mm.

Crouzet’s Brushless DC Motor delivers high speed and torque

Crouzet (www.crouzet.com), a world manufacturer of automation control components such as pneumatics, micro motor and micro control products, solid-state relays and sensors, has announced the release of the second generation 150 Watt Brushless DC Motor, which is durable enough to support high loads without operation interruption.

Featuring 150 Watt power, the new three-stage planetary gearbox provides expanded capabilities for applications demanding high torque and speed.

The company’s Model 80199701 gear motor offers variable torques and speeds, as well as maintains a quiet, smooth operation. A part of the 801997 series, the motor improves the company’s output torque to 120 Nm from 25 Nm. With 200 N axial and 1000 N radial, the robust motor easily handles high side loads and lends itself to long life and controllability.

Measuring just 229 mm in length and 81 mm in diameter, the compact motor integrates a shaft extension on the motor’s rear, enabling for brake or encoder. It is offered with one, two or three stage gearboxes, can operate with voltages from six to 75 VDC, and utilizes industry-standard eight-wire connection scheme and hall sensors.

“The use of this brushless DC motors is a logical choice where long life is a concern,” said Jim McNamara, Applications Engineer at Crouzet.

“That combined with the long life gear motor, makes it an excellent solution for many applications,” he added. “Other benefits include reduced noise, increased efficiency and the elimination of brush dust.”

Electromate’s OEM Servo Module for Brushless DC Motors

Electromate (www.electromate.com), a global provider of high-performance Automation and Motion Control Systems & Components, is proud to announce the release of the maxon motor DEC module 50/5 – a digital servo amplifier with high-speed controller for brushless DC motors up to 250 Watts.

The maxon motor DEC module 50/5 is a revolutionary and innovative speed controller for controlling brushless DC motors with Hall sensors of up to 250W. The new module works with an output current of 5A in continuous operation, and an operating voltage of up to 50V DC, with a highly efficient, flexible and versatile usage. Aside from comprehensive protection features, the amplifier also offers a large number of outputs and inputs, such as speed ranges, enable, speed monitor, direction of rotation presetting, operating status and current limiting, among others. Overcurrent, overvoltage and undervoltage, short circuit and thermal overload are all integrated to guarantee that the new controller can be used firmly.

The all-in-one amplifier, which has an extremely high-power density of 250W and continuous output power at 12cm2 (3cm x 4cm), may be seamlessly embedded into complex applications. The maxon motor DEC module 50/5 features a detailed evaluation board, which is available for initial start-up, and a comprehensive motherboard design guide to be integrated into OEM boards.

Brushless DC Servo Motors

Pittman® Series 1300 slotted brushless DC servo motors deliver more power in a smaller and cost-effective package to Mot They are ideal for power applications in a wide range of industries, including data storage, medical/biotech, semiconductor processing, automation, and others requiring high performance, long life, and reliability.

Despite their small size (1.3”/33mm diameter), these brushless DC motors can achieve peak torque from 10 oz-in to 57 oz-in and continuous torque from 3.5 oz-in to 8.5 oz-in, depending on model. Robust rotor construction allows rotational speeds up to 8000 RPM.

Standard features include three Hall sensors to provide rotor position feedback for electronic commutation; 3-phase stator with 6-slot silicon steel laminations; 4-pole rotor integrating high-energy neodymium ring magnets for optimized motor performance; and large ABEC ball bearings with high dynamic load ratings (up to 390 lbs.) and shielded to protect against contaminants.

Pittman Series 1300 brushless DC motors are available in three lengths (1.5 in., 2 in., and 2.5 in.) and are housed in precision-machined aluminum to promote lightweight designs and to integrate the front-endbell. Optional square flanges can be specified for NEMA 14 mounting.

AMETEK Technical & Industrial Products
www.ametektechnicalproducts.com