Electric Motors and Motor Control
ASHRAE Technical Committee 1.11

Scope of TC 1.11

TC 1.11 is concerned with electric motors (including hermetic) used in heating, ventilating, air-conditioning and refrigeration systems and the protection and control of such motors.


The ASHRAE Handbook is published in a series of four volumes, one of which is revised each year, ensuring that no volume is older than four years.

The Handbook can be purchased at the ASHRAE Bookstore by clicking on this link.

TC 1.11 is responsible for this chapter in the ASHRAE HVAC Systems and Equipment Volume of the Handbook:

Motors, Motor Controls, and Variable-Speed Drives
Many types of alternating-current (ac) motors are available; direct-current (dc) motors are also used, but to a more limited degree. National Electrical Manufacturers Association (NEMA) Standard MG 1 provides technical information on all types of ac and dc motors.

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Technical committees develop and sponsor technical sessions at the winter and annual conferences. Information about their future technical program is discussed at each TC meeting and at the TC’s Program Subcommittee meeting.

ASHRAE publishes papers and transactions from presentations at its conference events. In addition, ASHRAE records most of the seminar sessions from its conferences on DVD. These DVDs are ideal for use at chapter meetings, in university courses, or company lunch and learns. Products available from the most recent conference may be found here.

This list presents topics sponsored by this TC at past annual and winter meetings.

Panel -  VFD Generated Motor Bearing Currents Got Your Equipment Screaming?
Seminar - Residential Power Factor and EMI (FCC) Requirements for VSDs
Seminar - Variable Frequency Drive Performance: What Is It and How Does It Relate to AHRI 1210-2011?
Seminar - Role of Technology in Shaping the History of the United States
Seminar - Residential Power Factor and EMI (FCC) Requirements for VSDs
Forum - VSD Standards, what's in place, what's coming and what's needed
Seminar - Variable Speed Comparison: Induction vs. Permanent Magnet Motors
Seminar - Starters and drives - selection criteria, performance standards, longevity
Seminar – Back to Basics – Motors and VFDs
Seminar – VFDs Deliver Real Energy Savings
Forum - Variable Speed Drives (VSPD) and Residential Power Factor
Transaction (Symposium) - Motor Bearing Currents – Cause, Effect, & Mitigation


Technical Committees are responsible for identifying research topics, proposing research projects, selecting bidders, and monitoring research projects funded by ASHRAE. Information about their specific research program is discussed at each TC meeting and at the TC’s Research Subcommittee meeting.


ASHRAE writes standards for the purpose of establishing consensus for: 1) methods of test for use in commerce and 2) performance criteria for use as facilitators with which to guide the industry. ASHRAE publishes the following three types of voluntary consensus standards: Method of Measurement or Test (MOT), Standard Design and Standard Practice. ASHRAE does not write rating standards unless a suitable rating standard will not otherwise be available. ASHRAE is accredited by the American National Standards Institute (ANSI) and follows ANSI's requirements for due process and standards development. Standards may be purchased at the ASHRAE Bookstore.

ASHRAE Standard 222 is a method of test for determining the performance of HVAC&R-related adjustable-speed electric alternating-current (AC) power drive systems.


Other Activities

TIP: If MTG involvement add here otherwise leave blank.

Include other activities, such as MTG involvement, into this section.


ASHRAE Technical FAQs are provided as a service to ASHRAE members, users of ASHRAE publications, and the general public. While every effort has been made to ensure their accuracy and reliability, they are advisory and provided for informational purposes only, and in many cases represent only one person’s view. They are not intended and should not be relied on as an official statement of ASHRAE. Technical questions not addressed may be submitted to the ASHRAE Technical Services department at tse@ashrae.net.