Once we distinguish voltage unbalance from voltage variation, the need to tackle the issue intelligently becomes even more clear. Learn about common causes and effects, testing for unbalanced voltages and single-phasing, and ways to correct the problem if it does manage to arise.
Greenheck’s line of Vari-Green™ energy control products has expanded with the introduction of the Vari-Green Drive (Model VGD-100), a factory-mounted and wired variable speed control for three-phase motors up to 10 hp.
Nidec Motor Corporation (NMC) has launched a new family of variable speed products, which the company says offers product compatibility for a true system solution. With NMC’s ACCU-Series™ product line, customers can match a U.S. MOTORS® brand inverter duty motor with an NMC drive or panel or purchase integrated motors and controls. These products are solution driven and are designed to be used together as a system.
By diverting harmful VFD-induced shaft voltages safely to ground, AEGIS® PRO Series Rings protect large AC and DC motors from bearing damage. Available for motor shafts to 30-in diameter, AEGIS® PRO Series Rings are specially designed for high-current applications such as generators, turbines, and medium-voltage motors.
Nidec Motor Corporation (NMC) has launched the U.S. MOTORS® brand 3-10 hp electronically commutated (EC) motor with an IE4 (Super Premium efficiency) rating integrated with a tuned VFD. The product is available for variable torque pumps, fans, blowers, farm vents, and hydronic pumps. This motor is a member of the ACCU-SERIES line of variable speed products.
Danfoss has unveiled its new VLT® DriveMotor FCM106/FCP106. The VLT® FCM106 is a 0.55 to 7.5 kW drive mounted as a factory package on either an induction or permanent magnet motor. The VLT® FCP106 utilizes the same 4X drive, and, when purchased with an adaptor plate, can be mounted on the customers’ choice motor. A wall mount kit allows the drive to be mounted separate from the motor if needed.
NORD Gear Corp. has introduced the SK135E/SK175E soft start drive family, which the company says eliminates uncontrolled starting and mechanical strain on drive components. The starters are designed to be used in a distributed control system and can be mounted directly on the motor or near the motor
JVL says its new MIS23 QuickStep is a series of versatile, compact, economical integrated stepper motors. Integrated stepper motors in the MIS23 series have NEMA 23 flange dimensions of 57 mm by 57 mm and are available in three models with rated torques of: 1.1 Nm (MIS231), 1.6 Nm (MIS232), 2.5 Nm (MIS234) (1000 RPM @ 48VDC). To reduce cost and protect against electrical noise many of the control and communication functions have been integrated with the motor in a housing designed to provide IP42, IP55 or IP65 protection, and eliminating the need for running control and communication cables. Different PCB’s (modules) can be mounted within the housing to create an automation/motion control system that is easy to incorporate into new and existing applications, according to the company.
Engineered Systems magazine’s March 2020 issue showcases how students at one Apple Valley, Minnesota, high school helped the facility achieve LEED Gold; how engineers can design a system to heat a building using a chilled water system, the codes and steps behind adequately design a K-12 safety shelter, and much more.