US PATENT SUBCLASS 318 / 700
SYNCHRONOUS MOTOR SYSTEMS

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


318 /   HD   ELECTRICITY: MOTIVE POWER SYSTEMS

700SYNCHRONOUS MOTOR SYSTEMS {7}
701  DF  .~> Hysteresis or reluctance motor systems
702  DF  .~> Antihunting or damping
703  DF  .~> Braking
704  DF  .~> Pole changing motor winding circuits
705  DF  .~> Synchronization systems {4}
716  DF  .~> Field winding circuits {1}
720  DF  .~> Armature winding circuits {4}

DEFINITION

Classification: 318/700

SYNCHRONOUS MOTOR SYSTEMS:

(under the class definition) Subject matter wherein the system of supply and/or control is for a synchronous motor.

(1) Note. See Synchronous motor of the class definition for the definition of a "synchronous motor" as used in this subclass and the subclasses indented hereunder.

(2) Note. Where the frequency or the periodicity of the armature or primary circuit currents is determined solely by means actuated by the motor itself, classification is not herein but in some other appropriate subclass. See subclass 254.

(3) Note. In synchronous motors an energized alternating current winding produces a rotating electromagnetic field on a first member, and a fixed polarity magnetic field on a second member is rotatively movable with respect to the first member. The interaction of the two magnetic fields produces the rotation of the motor. The alternating current winding is referred to as the armature or the primary winding, and when the fixed field is produced by an energized winding, the energized winding is called the field winding.

(4) Note. Since synchronous motors are frequently used for phase or power-factor control purposes either (a) solely for such purposes by merely being connected to a power circuit with no load device being connected to the motor and generally, but not necessarily, having field excitation control means, or (b) for the combined purposes of phase or power-factor control and for driving useful load devices, it has been deemed advisable to classify the patents relating to synchronous motor systems in accordance with the function or functions performed thereby. Accordingly, synchronous "motor" systems will be classified on the basis of phase or power-factor control when the claimed subject matter is limited to such functions and all other synchronous motor systems will be classified on the basis of synchronous motors regardless of the disclosure in the respective specifications. Thus, for example, synchronous "motor" systems will be classified on the basis of:

A. Phase or Power-Factor Control. When the claimed subject matter: (1) refers to, or designates, the synchronous motor as: a. "phase adjusting means", b."phase modifier", c. "synchronous phase modifier", d. "synchronous condenser", e. "or any other means, the title of which definitely signifies that its function is to control phase or power factor such as, for example, as a f. "synchronous machine for correcting or modifying the power factor", or g. "synchronous motor for varying the power factor" which synchronous motor or machine is not limited to driving or actuating a useful load device and is connected to an electric circuit or system which is capable of supplying driving energy to the machine and which system is susceptible to having its phase or power factor affected by the machine; (2) refers to, or designates, the synchronous motor as a."synchronous machine", or b. "synchronous motor" and limits the motor or machine to being unloaded and is connected to an appropriate source of energy which is capable of supplying driving energy thereto which source is susceptible to having its phase or power factor affected by the machine; (3) refers to, or designates, the synchronous motor as a."synchronous machine", or a b. "synchronous motor" and is connected to an electrical system to which other load or translating devices or circuits are also connected, none of which other loads, however, being electric motors or otherwise limited to a particular art device or load such as, for example, a "lamp", "secondary battery", "space-discharge device", etc., and which synchronous machine or motor is not limited to driving or actuating a useful mechanical load device, regardless of whether excitation control means are claimed or not.

B. Synchronous Motor Systems. When the claimed subject matter: (1) refers to, or designates, the synchronous "motor" as (a) "synchronous machine", or a (b) "synchronous motor", and (2) is not included under part "A", immediately preceding, and (3) is not disclosed solely as a source of electric energy. (5) Note. In this subclass and those indented hereunder, where the synchronous motor has at least one stationary member and at least one rotating member movable relative to the stationary member, the fixed member is called the "stator" and the rotating member is called the "rotor".

(6) Note. Methods consistent with the apparatus in this group of subclasses will be placed with the appropriate apparatus.

(7) Note. In this subclass are synchronous motor systems which include both an armature or primary circuit and a direct current field excitation circuit where changeover from subsynchronous operation to synchronous operation or vice versa is involved. Also here are motor systems which do not require a DC field excitation circuit for synchronous operation but are double fed alternating current motor systems which operate at one or more synchronous speeds.

SEE OR SEARCH THIS CLASS, SUBCLASS:

47, for motor systems which include a synchronous and a nonsynchronous motor mechanically interconnected in a fixed or predetermined ratio of movement.

119+, for motor systems having a reciprocating or oscillating motor that operates synchronously with the periodicity of the source which supplies the electric energy thereto.

148, for generator-fed synchronous motor wherein the motor is controlled by controlling the generator.

254, see (2) Note above.

560+, for follow-up electric motor systems in which the motor controlled is a synchronous motor or operates, if at all, at a speed substantially synchronously with the motion of the transmitter.

731, for doubly fed induction motors which can run at synchronous speeds.

SEE OR SEARCH CLASS 323, Electricity: Power Supply or Regulation Systems,

201, 204 for phase control systems including synchronous dynamoelectric machines.