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Maximum torque per ampere (MTPA) control scheme for internal permanent magnet (IPM) machine is presented in this paper. Proposed control scheme was developed based on measurement of only DC link quantities eliminating the necessity of 3-phase current feedback. The scheme employs an online search algorithm with initial condition computed from a-priory system information. Hybridization of search based...
This paper proposes a novel topology which is capable of operate two permanent-magnet synchronous machines (PMSM) using a single 6-bridge inverter and its control method. In the conventional parallel connection method for this application, two motors can operate only at the same speed and have a high risk of loss of synchronism since the single voltage is applied to both motors. In other inverter...
In this paper, motor drive system fed by single phase diode rectifier without Power Factor Correction (PFC) circuit is proposed. The motor drive considered in this paper consists of single phase diode rectifier, three-phase inverter, and small DC-link capacitor. Since DC-link capacitor is small, grid input current of the diode rectifier can be directly affected by electrical output power of the inverter...
This paper presents an advanced pulse width modulation (PWM) method with cross-correlation-based digital signal processing for electric vehicle (EV) application. The algorithm is designed to adaptively apply PWM techniques depending on motor operating conditions: space vector PWM (SVPWM) method in the high total harmonic distortion (THD) condition and the discontinuous PWM (DPWM) method in the low...
In recent years, sensorless techniques based on HF carrier injection have become very popular as they are capable to estimate rotor position in a wide speed range. They can provide precise control over interior PMSMs without the accompanying need for a position sensor. However, in surface-mounted PMSMs, the estimation of rotor position is only reliable at light loads due to the very small saliency...
Asymmetrical multi-lane multi-phase motor drives are introduced in this paper. There are two conventional symmetrical drive systems for multi-phase motors. First one is modular phase multi-lane drive with single-phase inverters and second one is single-lane multi-leg inverter. While first one has high level of fault-tolerance, second one is a cost-effective solution. New class of drive systems, asymmetrical...
Stepper motor drives exhibit advantages like open loop capability, high torque density and lower cost with respect to other brushless servo alternatives. However, the typical performances of conventional open loop stepper motor drives are limited, making them unsuitable where high speeds, fast dynamics and smooth motion is required. They are also easily prone to stall and usually produce loud audible...
Most eco-friendly vehicles can adopt a concept of an integrated battery charger (IBC), which utilizes a motor drive system for charging a high voltage battery pack. The IBCs inevitably require an additional boost inductor when the common mode inductance of the motor/generator (M/G) is too small to satisfy a condition for continuous conduction mode operation. In this paper, the IBC system with the...
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