Permanent magnet synchronous machines (PMSMs) torque production capability depends on the permanent magnets (PMs) magnetization state, which can be affected by PMs temperature and of the current flowing throughout the stator windings; knowledge of the PMs temperature can be therefore of great importance both for control and monitoring purposes. PMs temperature can be measured or estimated; PM temperature measurement is not easy and is not normally implemented in commercial drives. PM temperature estimation methods can be divided into thermal models based, BEMF based and signal injection based methods. Existing HF signal injection methods estimate the PM temperature from the measured stator HF resistance. Unfortunately the resistance is also affected by magnetoresistive effect, which can limit the accuracy of the estimates. This paper proposes the use of the stator d-axis HF inductance for PM temperature estimation. This makes temperature estimation insensitive to magnetoresistive effect. In addition, it allows the use of higher frequencies, reducing the adverse impact of the injected signal on machine performance. 1
Torque estimation in permanent magnet synchronous machines is highly desirable in many applications. Torque produced by a permanent magnet synchronous machine depends on the permanent magnets' flux and dq-axes inductances. Consequently, precise knowledge of these parameters is required for proper torque estimation. This paper proposes the use of a high frequency signal for both PM flux and dq-axes inductances estimation. The high frequency signals will be injected in the stator via inverter superposed on top of the fundamental excitation. The proposed method can be used without interfering with the normal operation of the machine, the results being highly insensitive from machine's working condition. 1
Permanent magnet synchronous machines (PMSMs) torque production capability depends on the permanent magnets (PMs) magnetization state, which can be affected by PMs temperature and of the current flowing throughout the stator windings; knowledge of the PMs temperature can be therefore of great importance both for control and monitoring purposes. PMs temperature can be measured or estimated; PM temperature measurement is not easy and is not normally implemented in commercial drives. PM temperature estimation methods can be divided into thermal models based, BEMF based and signal injection based methods. Existing HF signal injection methods estimate the PM temperature from the measured stator HF resistance. Unfortunately the resistance is also affected by magnetoresistive effect, which can limit the accuracy of the estimates. This paper proposes the use of the stator d-axis HF inductance for PM temperature estimation. This makes temperature estimation insensitive to magnetoresistive effect. In addition, it allows the use of higher frequencies, reducing the adverse impact of the injected signal on machine performance. 1
Torque pulsations are one of the major concerns in permanent magnet synchronous machines (PMSMs). Torque pulsations can be mitigated by proper machine design and/or by control. Independently of the means being used, precise measurement of torque pulsation is highly desirable for the validation and improvement of machine designs and control strategies. This paper proposes a noninvasive, wireless vibration measurement system aimed to provide precise estimates of torque pulsations. The system is mounted on the rotor shaft of the PMSM, i.e. there is no mechanical coupling, and allows on-line measurement without interfering with the normal operation of the machine. 1
Torque estimation in permanent magnet synchronous machines (PMSMs) is highly desirable in many applications. Torque produced by a PMSM depends on the permanent magnets' (PM) flux and dq-axis inductances. Consequently, precise knowledge of these parameters is required for proper torque estimation. This paper proposes the use of a high frequency (HF) signal for PM flux and dq-axis inductances estimation. The HF signals will be injected in the stator via inverter superposed on top of the fundamental excitation. Appealing properties of this method include operation in real time, without interference with the normal operation of the machine and independent of machine working condition. 1
Control of permanent magnet synchronous machines (PMSMs)requires absolute rotor position measurement/estimation, as well as the magnet polarity detection for the machine start-up, encoders/resolvers being normally used for this purpose. However, these sensors can account for a large portion of the overall drive cost, and require additional room and cabling, therefore penalizing the size and reliability of the drive. This paper proposes a method to emulate a resolver in machines using low cost Hall-effect sensors. The proposed Hall-effect resolver (HER) system is a new type of angular position sensor for PMSMs. This allows to control machines which do not include a resolver from inverters which require a resolver signal to operate. 1
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