David Uzel

Optimal control and identification of model parameters of traction interior permanent magnet synchronous motor drive

This paper deals with a design of control of gearless wheel mounted drives of trams with interior permanent magnet synchronous motors (IPMSMs). The proposed control is based on a field oriented control linked to a rotor flux and optimally utilizes the reluctance component of torque in order to achieve maximum motor efficiency in entire speed range. For the optimal control, the stator inductances have to be known. Consequently, the three methods of their measurement were tried and compared. The first identifies motor inductances under steady-state conditions with freewheeling rotor. The second one has presented rotor locked rotor method technique which applies voltage pulses and the last one operates also with locked rotor, but a sinusoidal three-phase voltage source is used. The proposed drive control has been verified by experimental tests carried out on developed laboratory prototype of IPMSM.

Control and design considerations for wheel mounted drive of tram: Interesting features offered by IPMSM technology

This paper deals with a new configuration of gearless wheel mounted drives of trams. It introduces profitable properties of interior permanent magnet synchronous motor (IPMSM) for the drive and designs its new control strategy. The proposed control is based on a field oriented control linked to a rotor flux and optimally utilizes the reluctance component of torque in order to achieve maximum motor efficiency in entire speed range. In accordance with proposed control, optimal parameters of the drive were determined. The proposed drive design and its control are verified by simulations of a tram propulsion unit prototype.

Resolver motivated sensorless rotor position estimation of wound rotor synchronous motors

This paper presents a novel approach to sensorless control of wound rotor synchronous motor drives. The proposed rotor position estimation strategy is motivated by principle function of a resolver and utilizes design similarity between the controlled motor and the resolver based rotor position sensor. The rotor circuit is fed by controlled three-phase bridge rectifier which produces an ac component of frequency of 300Hz in the rotor excitation (flux) current. This ac component of rotor excitation current can be understood like an injection signal. Its response on the stator is evaluated by phase-lock-loop (PLL) which estimates the rotor position. This paper describes physical principle and functionality of the proposed sensorless rotor position estimation technique and verifies the theoretical foundations by simulation and experimental results made on developed drive prototype of rated power of 10kW.

Resolver motivated sensorless rotor position estimation of wound rotor synchronous motors with Kalman filter

This paper presents a novel estimation approach to sensorless control of wound rotor synchronous motor drives. The proposed rotor position estimation strategy is motivated by principle function of a resolver and utilizes design similarity between the controlled motor and the resolver based rotor position sensor. The rotor circuit is fed by controlled three-phase bridge rectifier which produces an ac component of frequency of 300Hz in the rotor excitation (flux) current. This ac component of rotor excitation current can be understood like an injection signal. Its response on the stator is evaluated by simplified Kalman filter which estimates the rotor position. This paper describes physical principle and functionality of the proposed sensorless rotor position estimation technique and verifies the theoretical foundations by simulation and experimental results made on developed drive prototype of rated power of 10kW.

Optimal vector control for wound rotor salient pole synchronous motor up to base speed

This contribution introduces an optimal control for wounded rotor salient pole synchronous motor intended for a new mining machine drive. The optimum considers demand for maximum torque of the motor. Hence the main idea is to find optimal values of stator flux current Isd and rotor field excitation current If to achieve maximum available torque of the machine. This contribution describes proposed control as well as used sensorless initial rotor position estimation because this mining machine drive will not use an absolute rotor position sensor. The theoretical conclusions are verified by both simulation results and extensive experiments made on developed down-scale prototype of investigated drive.

Considerations about sensorless control of permanent magnet synchronous motors at low speed and standstill for wheel mounted drive of tram

This paper deals with considerations about features of sensorless control for gearless wheel mounted drives of trams. This paper presents and compares properties of IPMSM and PMSM drives with pulsating injection sensorless control at low speeds. The proposed sensorless control and its features are verified by tram drive simulations and laboratory tests.

Estimator comparison for resolver motivated sensorless rotor position estimation of wound rotor synchronous motors

This paper compares the developed estimation approaches to sensorless control of wound rotor synchronous motor drives. The proposed rotor position estimation strategy is motivated by principle function of a resolver. The rotor circuit is fed by controlled three-phase bridge rectifier which produces an ac component of frequency of 300Hz. This is an injection signal. Its response on the stator can be evaluated by Phase lock loop (PLL) or simplified Kalman filter which estimates the rotor position. These two estimation strategies are in detail compared in this contribution. The comparison, theoretical foundations and conclusions are supported by both simulation and experimental results made on developed drive prototype.

Steady state torque optimal operating point control for wound rotor synchronous motors

This paper discusses steady state optimal control of the motor from the maximum torque point of view. The motor behavior is researched with a vector control supply in the full speed range. The optimal considerations are compared with a behavior of the classical control structures such as the unity power factor strategy.

Optimal vector control for wound rotor salient pole synchronous motors over full speed range

This contribution introduces an optimal control for wound rotor salient pole synchronous motor intended for a new mining machine drive. The optimum considers demand for maximum torque of the motor. Hence, the main idea is to find optimal values of stator flux current Isd and rotor field excitation current If to achieve maximum available torque of the machine. This contribution describes proposed control. The theoretical conclusions are verified by simulation results and extensive experiments made on developed down-scale prototype of the investigated drive.

Reduced-order Kalman filter in phase coordinates for IPMSM with higher flux harmonics

The aim of this paper is an investigation of an extended Kalman filer (EKF) based on a model in phase coordinates for sensorless control of an interior permanent magnet synchronous motor (IPMSM) with higher harmonics in the motor flux. The challenge for the EKF is to minimize its execution time especially for model in phase coordinates. This is achieved by using state space model of the drive with only two state variables, the rotor speed and the rotor position, which is known as the reduced-order model. This paper describes proposed EKF based estimator, verifies in simulations and experiments, that the EKF with this reduced model has low computational cost and high estimation accuracy. All experiments were carried out on a laboratory prototype of the IPMSM drive with rated power of 4 kW.