High Frequency Voltage Injection Research Articles

A New Observer Design Method for HF Signal Injection Sensorless Control of IPMSMs

We present a systematic approach to the design of an observer for rotor position and velocity of interior permanent magnet synchronous motors without rotational transducers, in which the effects of both motor and filter dynamics are taken into full account. The proposed observer can be incorporated directly into the well-known high-frequency voltage injection methods.

A New Compensation Method for High-Frequency Voltage Injection Based Sensorless Drive of Permanent-Magnet Synchronous Motors

This paper proposes a new compensation method that can efficiently compensate errors appearing in the phase estimate by the high-frequency voltage injection methods for sensorless drives of permanent-magnet synchronous motors. In the proposed method, the phase estimate is supposed to be determined by high-frequency components of stator current in the rotational reference frame aiming to be in phase with the rotor phase.

A New Speed-Varying Ellipse Voltage Injection Method for Sensorless Drive of Permanent-Magnet Synchronous Motors With Pole Saliency—New PLL Method Using High-Frequency Current Component Multiplied Signal

<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> This paper proposes a new sensorless vector control method for salient-pole permanent-magnet synchronous motors. With regard to phase estimation, the sensorless vector control method is featured by a new high-frequency voltage injection method (i.e., carrier modulation method), which is distinguished from the conventional ones by a unique ellipse shape of spatially rotating high-frequency voltage, and by a new phase-locked-loop method as a demodulation method whose input is a high-frequency current component multiplied signal. The new vector control method established by two innovative technologies for modulation/demodulation can have the following high-performance and attractive characteristics. 1) It can allow 250% rated torque at standstill. 2) It can operate from zero to the rated speed under the rated motoring or regenerating load. 3) It accepts instant injection of the rated load even for zero-speed control. 4) Phase estimation is robust against inverter dead time, and proper phase estimate can be obtained even under circumstances where stator current crosses the zero at high frequency. 5) Computational load for estimating rotor phase is very small. Usefulness of the proposed new vector control method is verified through extensive experiments. </para>

突極形永久磁石同期モータセンサレス駆動のための一般化速応楕円形高周波電圧印加法と鏡相推定法

This paper proposes a new generalized high-frequency voltage injection method for sensorless drive of salient-pole permanent-magnet synchronous motors. The injected high-frequency voltage has unique spatially-rotating ellipse-shape, whose both amplitudes of major and minor axes vary dependently of the motor speed, and can be designed through selecting a design parameter. The high-frequency current caused by the injected voltage, which has information of rotor phase to be estimated, is speed-independent, i.e. is not affected by the motor speed at all. Consequently, rotor phase can be estimated in wide speed range from zero to the rated speed. Through selection of the design parameter, property of the high-frequency current can be adjusted so that it fits for the associated motor-drive system consisting of a motor and an inverter. As a versatile phase estimation method for estimating rotor phase using the high-frequency current, the “mirror-phase estimation method" is re-constructed and re-proposed.

Use of a matrix converter to enhance the sensorless control of a surface-mount permanent-magnet AC motor at zero and low frequency

This paper addresses the use of a matrix converter (MC) with high-frequency voltage injection for zero- and low-speed sensorless control of surface mount permanent magnet alternating current motors. This paper also proposes a dual compensation technique that can practically eliminate zero-current-crossing distortions in MCs, discusses the effect of such distortions on sensorless control using injection techniques, and presents experimental results that illustrate the enhanced low-speed sensorless performance that can be obtained from exploiting the effective linearity of the MC operation.

突極形永久磁石同期モータセンサレス駆動のための速応楕円形高周波電圧印加法の提案

This paper proposes a new sensorless vector control method for salient-pole permanent-magnet synchronous motors. In regard to rotor phase estimation, the sensorless vector control method is featured by a new high-frequency voltage injection method distinguished from the conventional ones by a unique ellipse shape of the spatially rotating, and by a new PLL method whose input is a high frequency current auto-correlated signal. The new vector control method established by two innovative technologies can have the following high-performance and attractive features: 1) it can allow 250% rated torque at standstill; 2) it can operate from zero to the rated speed under the rated motoring or regenerating load; 3) it accepts instant injection of the rated load even for zero-speed control; 4) it accommodates a load with huge moment of inertia; 5) phase estimation is very robust against inverter dead time; 6) computational load for estimating rotor phase is very small, would be the smallest among the methods with comparable performance. This paper presents the new vector control method by focusing on two innovative technologies from its principles to design rules. Usefulness of the new vector control method is verified through extensive experiments.

A Study of Sensorless Control of Induction Motor at Zero Speed Utilizing High Frequency Voltage Injection

A detailed investigation of sensorless control of induction motor at zero and very low speed based on injection of a pulsating high frequency voltage signal is presented. A sensing technique is based on the secondary effect of magnetic spatial non-linearity caused by saturation of the stator laminations. Experimental and finite element results are presented.

Controller Design of Sensorless Induction Machine by High Frequency Voltage Injection

This paper describes a new sensorless induction motor drive scheme by injecting high frequency voltage signal. The signal is not a rotating one, but a fluctuating one at a synchronous rotating reference frame with the fundamental stator frequency. The difference of impedance between the flux axis and the quadrature axis at high frequency signal injection on the rotor flux angle is used to track the rotor flux angle. Since the injection signal is independent on the stator frequency, the monitoring of the differences of impedance can be done even at stand still condition of motor. Speed and current controller suitable for high frequency voltage injection are designed and verified by experiments.

A new zero-frequency flux-position detection approach for direct-field-oriented-control drives

This paper presents a novel approach to estimate the instantaneous position of the air-gap flux in standard induction machines at low and zero speed. The proposed approach is based on the generation of a high-frequency rotating field that, interacting with the main field, generates a high-frequency zero-sequence flux component. By demodulating such a component, which is always present, irrespective of speed and load levels, it is possible to detect the air-gap flux position. The proposed method allows one to overcome some key drawbacks of sensorless approaches based on high-frequency voltage injection and, compared to previous sensorless schemes exploiting the third harmonic voltage, improves the accuracy and extends the operating area up to zero speed. Experimental tests are shown in order to practically confirm the expected features of the proposed system.