Enhanced polyphase motor operation using a solid state inverter

• US 5,294,875 A
• Filed: 02/15/1991
• Issued: 03/15/1994
• Est. Priority Date: 05/25/1989
• Status: Expired due to Fees

• Current Assignee: Otis Elevator Company (Otis Worldwide Corp.)
• Original Assignee: Otis Elevator Company (Otis Worldwide Corp.)
• Inventors: Reddy, Narasimha K.
• Primary Examiner(s): Shoop, Jr., William M.
• Assistant Examiner(s): Cabeca, John W.
• Application Number:
  US07/657,932
• Time in Patent Office: 1,124 Days
• Field of Search: 318/701, 318/724, 318/138, 318/254, 318/779, 318/760, 318/801-806, 318/809, 318/811, 318/696, 310/166, 310/179, 310/180, 310/13, 310/189, 363/93, 363/56, 363/58
• US Class Current: 318/801
• CPC Class Codes: H02K 11/33 Drive circuits, e.g. power electronics H02K11/38 takes precedence
• CPC Class Codes: H02K 3/28 Layout of windings or of connections between windings windings for pole-changing H02K17/06, H02K17/14, H02K19/12, H02K19/32

Abstract

A polyphase motor is powered by an inverter. Each phase winding in the motor comprises two electrically insulated, electromagnetically coupled, conductors, making up a "phase bundle." Each conductor in the bundle is powered by its own transistor drive. The drives for each phase winding respond to a common phase signal for instance from a pulse width modulator.

Claims

1. A polyphase motor drive including an inverter and a polyphase motor, comprising:

a plurality of phase drives, each phase drive responsive to a phase drive input signal, each phase drive for providing a current signal;

a motor having a plurality of phase windings, each winding comprising at least two electrically insulated, electromagnetically coupled conductors wound together, each conductor corresponding to one of said phase drives, each of said conductors being responsive to a corresponding one of said current signals for providing current to said motor.

2. The polyphase motor drive of claim 1, wherein said phase windings are wound together in the same slot.

3. A polyphase motor drive, including a polyphase motor, comprising:

a plurality of phase drives, each phase drive including a pair of complementary transistors, each phase drive responsive to a phase drive input signal, each phase drive providing a current signal;

a motor having a plurality of phase windings, each phase winding comprising at least two electrically insulated conductors, each conductor corresponding to one of said phase drive, each conductor responsive to a corresponding one of said current signals for providing currents to said motor.