Development of a new sensorless vector‐controlled and transmissionless electric vehicle using a permanent‐magnet synchronous motor

Electrical Engineering Japan

2007

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SUMMARYThis paper proposes a new current control method for energy-efficient and/or wide-speed-range drive of salientpole permanent magnet synchronous motors. The proposed method is distinguished from conventional ones by the following features. (1) The original command is a signed current norm. (2) The exact d-axis and q-axis current commands that perform energy-efficient and/or wide-speedrange drive are analytically and simply determined from the singed current norm command. (3) For speed control mode, the system turns out to be nonlinear, but its stability can be guaranteed based on Popov's stability theorem. (4) It can be applied for a mode similar to torque control. (5) Current limitation can be carried out accurately but very simply. Concrete analytical d-axis and q-axis current commands are presented, which satisfy exactly one of three optimum current control codes such as maximum torque, maximum power factor, and voltage limitation. A design method for PI speed controller that guarantees system stability is also presented.

“…11, and to Ref. 9 for a specific method of use) [9]. The proposed method is expected to also have value in other industrial applications besides the SP-PMSM.…”

Section: Resultsmentioning

confidence: 97%

Section: A Current Norm Control Using Direct Commandmentioning

confidence: 97%

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A new current control method for energy‐efficient/wide‐speed‐range drive of permanent magnet synchronous motor

Electrical Engineering Japan

2007

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“…(10) holds, the following relationship also holds [1] based on Eqs. (1) through (8) for the stator high-frequency components v 1h , i 1h , and f 1h : Theorem 1 below, which is quite general, holds for the stator high-frequency components v 1h , i 1h , and f 1h in Eqs. (11) and (12).…”

Section: Generating the Nonrotating High-frequency Flux And The Princmentioning

confidence: 95%

A new high‐frequency voltage injection method for sensorless drive of permanent‐magnet synchronous motors with pole saliency

Electrical Engineering Japan

2008

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SUMMARYThis 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 characterized by a new high-frequency voltage injection method distinguished from the conventional ones by a unique ellipse shape of the spatial rotation, and by a new PLL method whose input is a high-frequency current autocorrelated 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) the 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.

“…Usefulness of the new vector control method is verified through extensive experiments. (7) (10) (1) (7) (10) (1) (3) (4) (7) (10) 200 250% 100(rad/s) 1 (8) (10) SP-PMSM 250% 1 (1) N N PLL N (1) …”

mentioning

confidence: 99%

A New High-Frequency Voltage Injection Method for Sensorless Drive of Permanent-Magnet Synchronous Motors with Pole Saliency

2006

IEEJ Trans. IA

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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 high-performance and attractive features as follows.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. Fig. 1 shows a structure of the proposed new sensorless vector control system. Phase and speed of the rotor are estimated in the "phase estimator," whose structure can be illustrated as in Fig. 2. As shown, it simply consists of two single-input/output band-pass filters, a single-input/output low-pass filter, a phase synchronizer, and a speed-variable-ellipse high-frequency voltage commander (SVE-HFVC). The phase synchronizer is a kind of so-called PLL, but whose input is a high-frequency current correlated signal. SVE-HFVC generates high-frequency voltage command of unique ellipse shape. The phase estimator is very simple, but its performance is excellent as demonstrated in the following. Fig. 3 shows a example of torque responses at standstill to the 250% rating torque command, where wavelike data imply, from the top, q-current, u-phase current, actual rotor phase and its estimate. It is clearly observed that the phase is well estimated and 250% rated q-current (torque-producing current) is well controlled although the rotor starts to rotate at instant of torque command injection due to narrow speed bandwidth of the load machine controlled to be zerospeed. -20 -