EPE Association: EPE 1995 - 23 - Lecture Session L6c: DRIVES, SPECIAL ASPECTS

EPE 1995 - 23 - Lecture Session L6c: DRIVES, SPECIAL ASPECTS
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1995 - Conference > EPE 1995 - 23 - Lecture Session L6c: DRIVES, SPECIAL ASPECTS

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   INFLUENCE OF SWITCHING FREQUENCY AND SQUIRREL CAGE DESIGN ON AUDIBLE NOISE AND LOSSES IN VARIABLE SPEED INDUCTION MOTOR DRIVES WITH TRANSISTOR AND IGBT INVERTER
By S. Van Haute; A. Malfait; G. Meynants; R. Reekmans; R. Belmans [View]
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Abstract: A large number of experiments are performed to analyse the influence of the inverter type and the switching frequency on the audible noise, losses and overall efficiency in induction motor drives. Temperature measurements both in stator and rotor give an indication of the required derating, if any. Results for a standard design motor, consecutively supplied by a transistor based inverter and IGBT inverter are compared with the behaviour when the machine is directly connected to the mains. To analyse the influence of the rotor design, a special rotor with no current redistribution is constructed and mounted in a rewind stator. Higher switching frequencies have a large influence on audible noise and temperature, but the overall efficiency remains nearly constant. However the distribution of losses is influenced.

   DESIGN AND PERFORMANCE OF A HIGH EFFICIENCY, 5-PHASE SWITCHED RELUCTANCE DRIVE
By A. M. Michaelides; C. Pollock [View]
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Abstract: A new configuration of switched reluctance drive is proposed in which the motor windings are configured to encourage short flux paths within the motor. The 5-phase prototype motor can be f ed from a new power converter which uses six switching devices in a shared switch configuration. Experimental results demonstrate that the 5-phase prototype achieves higher eff iciency than prior art switched reluctance and induction drives constructed in the same frame size, and with the benefit of the new electronic circuit it is very cost effective.

   Position Sensor-less Control of a Half-Wave Rectified Brushless Synchronous Motor
By Jun Oyama; Takashi Abe; Tsuyoshi Higuchi; Eiji Yamada; Kenji Shibahara [View]
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Abstract: We proposed a "half-wave rectified brushless synchronous motor" as a novel servo motor. This motor has simple and robust brushless structure and is maintenance free. This motor provides us with the torque control operation over the speed range from zero to the rated speed. We also proposed a new type half-wave rectified brushless synchronous motor with permanent magnet in order to improve the power factor and efficiency. This paper proposes a new position sensorless control system using half-wave rectified brushless synchronous motor. The emf, in the rotor winding of this motor, is induced by the mmf which rotates at synchronous speed and pulsates at bias frequency. The field poles are excited by the field current obtained by rectifying the emf with a diode inserted into the field winding. If there is any displacement between the axis of rotating mmf and the axis of the rotor, the impedance of the field circuit varies. Therefor, rotor position can be detected only by measuring bias frequency components of armature voltage.

   FLUX, POSITION, AND VELOCITY ESTIMATION IN AC MACHINES AT ZERO AND LOW SPEED VIA TRACKING OF HIGH FREQUENCY SALIENCIES
By P. L. Jansen; M. J. Corley; R. D. Lorenz [View]
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Abstract: This paper presents an elegantly simple and viable generalized approach to achieving robust, accurate transducerless state estimation in polyphase AC machines, including the estimation of flux, position, and velocity in induction and synchronous machines at zero and low speeds. lt is based upon the tracking of magnetic saliencies via inverter-generated high-frequency signal injection with demodulation incorporating heterodyning and a closed loop observer. The saliencies may be saturation-induced, thus yielding a means of direct flux position estimation, or rotor-constructed and thus yielding rotor position and velocity estimation. Experimental results are provided demonstrating rotor positi9n estimation with a permanent magnet synchronous motor.

EPE 1995 - 23 - Lecture Session L6c: DRIVES, SPECIAL ASPECTS
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1995 - Conference > EPE 1995 - 23 - Lecture Session L6c: DRIVES, SPECIAL ASPECTS
	[return to parent folder]

	INFLUENCE OF SWITCHING FREQUENCY AND SQUIRREL CAGE DESIGN ON AUDIBLE NOISE AND LOSSES IN VARIABLE SPEED INDUCTION MOTOR DRIVES WITH TRANSISTOR AND IGBT INVERTER By S. Van Haute; A. Malfait; G. Meynants; R. Reekmans; R. Belmans	[View] [Download]
Abstract: A large number of experiments are performed to analyse the influence of the inverter type and the switching frequency on the audible noise, losses and overall efficiency in induction motor drives. Temperature measurements both in stator and rotor give an indication of the required derating, if any. Results for a standard design motor, consecutively supplied by a transistor based inverter and IGBT inverter are compared with the behaviour when the machine is directly connected to the mains. To analyse the influence of the rotor design, a special rotor with no current redistribution is constructed and mounted in a rewind stator. Higher switching frequencies have a large influence on audible noise and temperature, but the overall efficiency remains nearly constant. However the distribution of losses is influenced.

	DESIGN AND PERFORMANCE OF A HIGH EFFICIENCY, 5-PHASE SWITCHED RELUCTANCE DRIVE By A. M. Michaelides; C. Pollock	[View] [Download]
Abstract: A new configuration of switched reluctance drive is proposed in which the motor windings are configured to encourage short flux paths within the motor. The 5-phase prototype motor can be f ed from a new power converter which uses six switching devices in a shared switch configuration. Experimental results demonstrate that the 5-phase prototype achieves higher eff iciency than prior art switched reluctance and induction drives constructed in the same frame size, and with the benefit of the new electronic circuit it is very cost effective.

	Position Sensor-less Control of a Half-Wave Rectified Brushless Synchronous Motor By Jun Oyama; Takashi Abe; Tsuyoshi Higuchi; Eiji Yamada; Kenji Shibahara	[View] [Download]
Abstract: We proposed a "half-wave rectified brushless synchronous motor" as a novel servo motor. This motor has simple and robust brushless structure and is maintenance free. This motor provides us with the torque control operation over the speed range from zero to the rated speed. We also proposed a new type half-wave rectified brushless synchronous motor with permanent magnet in order to improve the power factor and efficiency. This paper proposes a new position sensorless control system using half-wave rectified brushless synchronous motor. The emf, in the rotor winding of this motor, is induced by the mmf which rotates at synchronous speed and pulsates at bias frequency. The field poles are excited by the field current obtained by rectifying the emf with a diode inserted into the field winding. If there is any displacement between the axis of rotating mmf and the axis of the rotor, the impedance of the field circuit varies. Therefor, rotor position can be detected only by measuring bias frequency components of armature voltage.

	FLUX, POSITION, AND VELOCITY ESTIMATION IN AC MACHINES AT ZERO AND LOW SPEED VIA TRACKING OF HIGH FREQUENCY SALIENCIES By P. L. Jansen; M. J. Corley; R. D. Lorenz	[View] [Download]
Abstract: This paper presents an elegantly simple and viable generalized approach to achieving robust, accurate transducerless state estimation in polyphase AC machines, including the estimation of flux, position, and velocity in induction and synchronous machines at zero and low speeds. lt is based upon the tracking of magnetic saliencies via inverter-generated high-frequency signal injection with demodulation incorporating heterodyning and a closed loop observer. The saliencies may be saturation-induced, thus yielding a means of direct flux position estimation, or rotor-constructed and thus yielding rotor position and velocity estimation. Experimental results are provided demonstrating rotor positi9n estimation with a permanent magnet synchronous motor.