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Hazardous Area
Hazardous Area Stepper Motors -PT Frame Sizes
Hazardous Area Stepper Motors
Empire Magnetics’ PT Series Hazardous Area Step Motors are sealed and equipped with air fittings for pressurization. With an optional temperature sensor, PT Hazardous Area Step Motors can be easily designed into a system which meets NFPA requirements for Class I, Class II and Class III hazardous locations.
In a typical installation—such as spray painting, printing, flour mills, fuel processing, alcohol production, chemical processing or rocket fuel machining—the motor is remotely located in a hazardous area. Air lines, power and temperature sensor cables run to the control station in a non-hazardous area. Protective conduit shields cabling from mechanical damage. At the control station, a temperature indicator with a set-point alarm displays motor temperature. The set-point alarm output will cut power to the drive if temperature exceeds the set-point. A differential pressure switch on the return air line monitors motor pressure. If pressure fails, this switch also cuts power to the drive. When power is applied, the motor undergoes a purge delay period before being energized.
Hazardous Area Step Motor Frame Size Selection:
Hazardous Area Step Motors are typically made in groups or families, the families are identified by the outer diameter or size of the square, these references are called frame sizes. In the American system, a 23 frame is a nominal 2.3 inches in diameter. For Hazardous Area Step Motors less than one inch in diameter, the reference is typically known as a size. Herein is a list of the frame sizes offered by Empire Magnetics Inc. and some of the characteristics of the group that will allow you to select from them.
Frame Size 17
Stepper Motors
Nominal outer dimension of 1.7 inches, these Hazardous Area Step Motors are relatively low power useful for a wide range of industrial applications. Torque range of 13 to 26 oz-in. Cylindrical shaped motor laminations, with square end flanges front and rear. Since this motor does not have a housing, it is not available in all. environments.
Frame Size 23
Stepper Motors
Nominal outer dimension of 2.3 inches. Extremely popular size useful for a wide range of industrial applications. Torque range of 60 to 150 oz-in. Cylindrical shaped motor with square front flange.
Frama Size 34
Stepper Motors
Nominal outer dimension of 3.4 inches. Power range of 80- 240 watts, useful for a wide range of applications. Torque range of 150 to 450 oz-in. Cylindrical shaped motor with square front flange.
Select Frame Size 42
Stepper Motors
Nominal outer dimension of 4.2 inches. Power range of 240-700 watts, relatively high power in the stepper motor range. Torque range of 400 to 1600 oz-in. Cylindrical shaped motor with square front flange.
Products for use in Hazardous Areas
Automating an industrial process is a complex problem when combustible vapors or dust are present in the work environment.
Two commonly used methods are Explosion Proof (EP) and Purged and Pressurized (PT). Explosion Proof devices are intended to withstand and contain an expected explosion, Purged and Pressurized systems are intended to prevent an explosion from occurring. While Explosion Proof is more widely known the Purged and Pressurized technique is more flexible and universally recognized.
The National Fire Protection Association publishes “Purged and Pressurized Enclosures for Electrical Equipment in Hazardous Locations“, (NFPA496), which describes the application of positive pressure with dry air or nitrogen to convert the interior of a motor to a non-hazardous area. A copy of the standard is available from the NFPA, (call 800/344-3555). Additional information is included in the National Electric Code, also written by the NFPA.
For applications and information, the following article may be of interest:
Using Purge and Pressurization to Prevent Explosions
Note:
Empire Magnetics makes no claim as to the suitability of pressurized motors for any particular application. These products are not rated or warranted as Explosion Proof Motors, nor does Empire Magnetics assume any liability for their use in proximity to volatile materials. Responsibility for motor use lies solely with the user.
Each unit includes a ten foot cable. Cables up to 100 feet in length may be ordered. NPT cable penetration allows connection of conduit. Use of pressurized conduit is recommended. Motors are otherwise supplied with air fittings.
Frame size families:
- Hazardous Area Stepper Motors Frame 17
- Hazardous Area Stepper Motors Frame 23
- Hazardous Area Stepper Motors Frame 34
- Hazardous Area Stepper Motors Frame 42
Learn about Hazardous Area Motor Applications
Frequently Asked Questions (FAQ)
About Hazardous Area Motors
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Why Choose Empire Magnetics
Government Projects & Defense Applications
Empire Magnetics has been awarded and completed US Navy contracts in excess of $100,000 as a prime contractor. The Cage code number assigned was OYMU1, CEC code 19665900H. As a subcontractor to RSI/Comsat, SAIC, Lockheed Martin, Westinghouse, General Electric and other prime contractors for the US Government, contracts in excess of $200,000 have been awarded and completed.
Nationwide & International Distributors for Specialty Motors & Complete Motor System Solutions
Empire Magnetics products are distributed by a nationwide and international network of motion control sales professionals. Your local distributor carries the drives and controls, and the accessories needed to build a complete motion control system.