#### 7.2.2.9 IfcElectricMotorTypeEnum

The IfcElectricMotorTypeEnum defines the range of different types of electric motor that can be specified.

> HISTORY New type in IFC2x2.

Enumerated Item Definitions:

- DC: A motor using either generated or rectified Direct Current (DC) power.
- INDUCTION: An alternating current motor in which the primary winding on one member (usually the stator) is connected to the power source and a secondary winding or a squirrel-cage secondary winding on the other member (usually the rotor) carries the induced current. There is no physical electrical connection to the secondary winding, its current is induced.
- POLYPHASE: A two or three-phase induction motor in which the windings, one for each phase, are evenly divided by the same number of electrical degrees.
- RELUCTANCESYNCHRONOUS: A synchronous motor with a special rotor design which directly lines the rotor up with the rotating magnetic field of the stator, allowing for no slip under load.
- SYNCHRONOUS: A motor that operates at a constant speed up to full load. The rotor speed is equal to the speed of the rotating magnetic field of the stator; there is no slip.
- USERDEFINED: User-defined type.
- NOTDEFINED: Undefined type.

XSD Specification:

<xs:simpleType name="IfcElectricMotorTypeEnum">
<xs:restriction base="xs:string">
<xs:enumeration value="dc"/>
<xs:enumeration value="induction"/>
<xs:enumeration value="polyphase"/>
<xs:enumeration value="reluctancesynchronous"/>
<xs:enumeration value="synchronous"/>
<xs:enumeration value="userdefined"/>
<xs:enumeration value="notdefined"/>
</xs:restriction>
</xs:simpleType>

EXPRESS Specification:

TYPE IfcElectricMotorTypeEnum = ENUMERATION OF (
| DC, INDUCTION, POLYPHASE, RELUCTANCESYNCHRONOUS, SYNCHRONOUS, USERDEFINED, NOTDEFINED);
END_TYPE;

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