Duty-cycling's extra heat: will it void warranty

Journal Article · Mon Feb 12 04:00:00 EST 1979 · Energy User News; (United States)

OSTI ID:6436806

Several industry experts are warning that energy management systems that use duty-cycling of electric motors to conserve energy and balance loads could cause motor burnout and possibly void the manufacturer's warranty. Burnout would be caused by the additional current used during startup, which would raise heat levels without allowing sufficient time for the heat to dissipate before the next startup. Fatigue shock and shorting could also increase with frequent startings. There is no evidence yet to substantiate this position, but there is agreement that cumulative effects could shorten a motor's service life. Sophisticated computer and microprocessor systems can cycle equipment every minute, which could exceed the motor's cycling capacity. The major problem lies with Design B electric motors with National Electrical Manufacturer's Association (NEMA) horsepower ratings of 250 or under. This includes the majority of motors sold in this country. Motor users are urged to check with the manufacturer before initiating a cycling program.

• OSTI ID: 6436806
• Journal Information: Energy User News; (United States), Journal Name: Energy User News; (United States) Vol. 4:7; ISSN EUSND
• Country of Publication: United States
• Language: English

Related Subjects

29 ENERGY PLANNING, POLICY, AND ECONOMY
291000* -- Energy Planning & Policy-- Conservation
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320104 -- Energy Conservation
Consumption
& Utilization-- Commercial & Industrial Buildings-- (-1987)
320303 -- Energy Conservation
Consumption
& Utilization-- Industrial & Agricultural Processes-- Equipment & Processes
CONSUMER PROTECTION
CONTROL SYSTEMS
DAMAGE
ELECTRIC MOTORS
ENERGY MANAGEMENT
MANAGEMENT
MECHANICAL PROPERTIES
MOTORS
POWER DEMAND
TEMPERATURE EFFECTS