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Interior permanent magnet synchronous machine drives are widely employed in electric traction systems and various industrial processes. However, prolonged exposure to high temperatures while operating can demagnetize the permanent magnets to the point of irreversible demagnetization. In addition, direct measurements with infrared sensors or contact-types sensors with wireless communication can be...
Thermal monitoring is a common feature in most of electric machine drives since thermal overloading is one of the most common causes of motor failures. Contact-type sensors are normally used to measure the stator temperature in electric machines. However, use of this type of sensor is not advisable in the rotor as it requires cabling to a rotating part or the use of a wireless transmission system...
The injection of a high frequency signal in the stator via inverter has been shown to be a viable option to estimate the magnet temperature in PMSMs. The variation of the magnet resistance with temperature is reflected in the stator high frequency resistance, which can be measured from the resulting current when a high frequency voltage is injected. However, this method is sensitive to d and q-axis...
In this paper, a detailed study of the performance of rotor flux and reactive power based MRAS rotor resistance estimators for Vector Controlled Induction Motor drive is presented. The rotor resistance changes significantly during operation of the drive due to temperature rise and saturation. This variation has a major influence on the performance of the field oriented control of induction motor drive...
This paper introduces a novel approach to identifying the ohmic stator resistance Rs of permanent magnet synchronous machines (PMSM) based on low frequency signal injection. The identification does not depend on specific speed or load conditions. Besides the value of Lq(id, iq), no further electrical parameter is needed for the identification algorithm. The proposed stator resistance identification...
Until recently, power plant operators have had very limited options for on-line monitoring of the health of motor and generator rotors, particularly those with brushless excitation systems. Degradation of field winding insulation can lead to ground faults or shorted turns, with little or no warning. Moreover, the capability to monitor local hot spot temperatures on rotor windings in service has not...
Rotor bars of induction motors are at a high risk of thermal damage during heavy overload, impaired cooling conditions or prolonged starting. State-of-the-art relays for induction motors utilize a starting inhibit algorithm for the thermal protection. In many cases, it is too conservative and can not adapt to the changes in the motor's cooling capability. This paper reviews available thermal model-based...
Thermal protection is one of the most important aspects of any motor control system. This paper proposes a stator winding temperature estimation method for the thermal protection of inverter-fed electric motors. By modifying the space vector pulse width modulation (SVPWM) in an open-loop motor drive, a dc voltage can be intermittently injected into the motor. The stator temperature can be estimated...
A direct online stator winding resistance measurement scheme is proposed as a means to improve standard efficiency tests of polyphase induction machines. To enable resistance measurement a DC current is injected online into the stator winding and response voltages are captured. In experimental tests an unequal number of anti-parallel diodes has been used to inject DC current. A bespoke temperature...
A non-intrusive stator winding resistance estimation technique is proposed for soft-starter-connected induction motors. By changing the gate drive signal of the thyristors in the soft-starter, a small dc bias can be intermittently injected to the motor. Based on continuous monitoring of the stator winding resistance, a new thermal monitoring scheme is proposed using only voltage, current, some motor...
Based on previous investigations it is shown that the accuracy of online stator resistance monitoring of AC-machines fed by PWM inverters when using the superposition method suffers from dead time effects. A new and simple correction procedure is proposed to achieve high measurement accuracy without using temperature sensors. No additional hardware is required for this method. Experimental results...
A remote and sensorless stator winding resistance estimation method for thermal monitoring has been proposed for soft-starter-connected induction motors by the authors. As an continuation of the previous work, this paper specifically focuses on the practical implementation of the proposed method. In this paper, a compensation method for the measurement offsets is introduced to improve the performance...
This paper deals with temperature calculation using equivalent thermal network in interior permanent magnet synchronous motor (IPMSM) under the steady-state condition. The equivalent thermal network consists of heat sources, which are generated from copper loss and iron loss, and thermal resistances considering conduction and convection. The heat transfer coefficient in conduction is decided by material...
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