Performance of large line-start permanent magnet synchronous motors

IEEE Trans. on Ind. Applicat.

Cossar

et al. 2004

Abstract-This paper describes an efficient calculating procedure for the steady-state operation of a single-phase line-start capacitor-run permanent-magnet motor. This class of motor is beginning to be applied in hermetic refrigerator compressors as a highefficiency alternative to either a plain induction motor or a full inverter-fed drive. The calculation relies on a combination of reference-frame transformations including symmetrical components to cope with imbalance, and axes to cope with saliency. Computed results are compared with test data. The agreement is generally good, especially in describing the general properties of the motor. However, it is shown that certain important effects are beyond the limit of simple circuit analysis and require a more complex numerical analysis method.

Section: Solution Of the Negative-sequence Systemmentioning

confidence: 99%

Line-Start Permanent-Magnet Motor Single-Phase Steady-State Performance Analysis

IEEE Trans. on Ind. Applicat.

Cossar

et al. 2004

“…A complete -axis analysis of the magnet braking torque for a 3-phase symmetrical LSPM motor is given in [4] and [16]. Expressions for determining the currents and the flux linkages due to the magnets and the magnet braking torque are determined accordingly for the unsymmetrical single-phase LSPM motor.…”

Section: The Asynchronous Magnet Braking Torquementioning

confidence: 99%

“…Current generated by the rotating magnets causes a Joule loss in the stator circuit resistance, which results in a drag torque or magnet braking torque, [1], [2], [4], [6], [16]. Torque oscillations during starting are not only higher, but also persist longer than those in the induction motor.…”

Section: Introductionmentioning

confidence: 99%

Asynchronous Performance Analysis of a Single-Phase Capacitor-Start, Capacitor-Run Permanent Magnet Motor

IEEE Trans. On Energy Conversion

McGilp

et al. 2005

Abstract-This paper presents a detailed analysis of the asynchronous torque components (average cage, magnet braking torque and pulsating) for a single-phase capacitor-start, capacitor-run permanent magnet motor. The computed envelope of pulsating torque superimposed over the average electromagnetic torque leads to an accurate prediction of starting torque. The developed approach is realized by means of a combination of symmetrical components and -axes theory and it can be extended for any -phase AC motor -induction, synchronous reluctance or synchronous permanent magnet. The resultant average electromagnetic torque is determined by superimposing the asynchronous torques and magnet braking torque effects.

“…General structure of the connections for a capacitor one-phase permanent magnet ac motor. The capacitor voltage is a state variable and must be incorporated in the terminal constraints of the permanent magnet ac motor, which are (14)- (17) In steady-state operation, the motor performance can be predicted using the symmetrical components theory [6]. Thus, the positive sequence voltage is characterized by the following average electromagnetic torque components:…”

Section: B Capacitor-start Capacitor-run Motormentioning

confidence: 99%

Torque Behavior of One-Phase Permanent-Magnet AC Motor

IEEE Trans. On Energy Conversion

McGilp

et al. 2006

Abstract-This paper presents a detailed comparative study of two starting and running methods for a single-phase permanent magnet synchronous motor, equipped with a squirrel-cage rotor. The analysis of the motor performance is realized for a pulse width modulated (PWM) inverter fed motor and for a capacitor-start, capacitor-run motor. The developed approach may be extended to any 1-phase ac motor-induction, synchronous reluctance or synchronous permanent magnet.