Method for maximizing power output in permanent field synchronous motors

• US 20040008004A1
• Filed: 11/25/2002
• Published: 01/15/2004
• Est. Priority Date: 11/27/2001
• Status: Active Grant

• Current Assignee: Siemens AG
• Original Assignee: Siemens AG
• Inventors: Georg, Klaus, Papiernik, Wolfgang, Kuenzel, Stefan
• Granted Patent: US 6,806,676 B2
• Time in Patent Office: Days
• US Class Current: 318/721
• CPC Class Codes: H02P 21/06 Rotor flux based control involving the use of rotor position or rotor speed sensors
• CPC Class Codes: H02P 25/08 Reluctance motors
• CPC Class Codes: H02P 6/08 Arrangements for controlling the speed or torque of a single motor H02P6/10, H02P6/28 take precedence

Abstract

A method of maximizing the power or torque output of a synchronous motor with reluctance effect is disclosed. Bases on torque and voltage set points, in the regulation of the synchronous motor, an optimal torque- and field producing current is generated. The method can further generate an optimal voltage which can maximize the power output of a synchronous motor since changes of inductances generated by the current itself can be accounted for.

Claims

1. A method for maximizing power output in a synchronous motor, said method comprising the steps of:

generating a torque and a field producing current within said synchronous motor being optimal with respect to torque and power generation;

deriving an optimal torque producing current from said torque and said field producing current.

2. The method of claim 1 wherein said optimal torque and field producing current is derived through iterative feedback.

3. The method of claim 1 wherein said field-generating current is derived directly from the inductances of said synchronous motor.

4. The method of claim 1, further comprising the steps of:

calculating a torque set point;

calculating a voltage set point corresponding to said torque set point;

deriving an optimal field and torque producing current based on torque and voltage set points for regulating said synchronous motor.

5. The method of claim 4 wherein said maximum torque is generated by iterative feedback.

6. The method of claim 4 wherein said maximum torque is generated by assuming decreases in the inductances of said synchronous motor.