Electricity: motive power systems – Synchronous motor systems – Armature winding circuits
Patent
1989-01-17
1991-04-09
Shoop, Jr., William M.
Electricity: motive power systems
Synchronous motor systems
Armature winding circuits
318254, 318705, H02P 534
Patent
active
050067761
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to electrical machines and, more particularly, to a gate-controlled electric drive.
DESCRIPTION OF THE PRIOR ART
The gate-controlled electric drive has recently found wide application. However, these electric drives are fed from a.c. mains or from a d.c. power source and comprise a complex power system with rectifiers and filters. When such devices are included into the circuit of a gate-controlled electric drive, they increase the weight, dimensions and cost of this drive and, at the same time, reduce its reliability and efficiency.
Known in the art is a gate-controlled electric drive (SU, A, 1144201) comprising a synchronous motor having windings connected to the output of a polyphase controlled transforming unit; a phase inverter which is mechanically connected to the shaft of the synchronous motor, the polyphase winding of said inverter being connected to a polyphase sine wave voltage source; a phase-shifting unit; a phase difference measuring unit; a controlled pulse generator and a permanent memory.
This prior art gate-controlled electric drive is designed for connection to a.c. power mains and is equipped with a complex control system. When a gate-controlled electric drive is supplied from a.c. mains it must include a rectifier and a filter, which reduce its reliability and efficiency, increase the cost, weight and overal dimensions.
Also known in the art is a gate-controlled electric drive (SU, A, 1244779) comprising a synchronous motor with m windings, a short position transducer whose output is connected to the address input of a fixed memory storing codes of width and polarities of power supply pulses fed to the windings of the synchronous motor, the m outputs for setting a pulse width code of said fixed memory being connected to the inputs of m pulse-width modulators. The complementing input of each pulse-width modulator is connected to the output of a controlled-frequency divider whose control input receives a control signal modulus code, while the complementing input is connected to a pulse generator. (m-1) outputs for a polarity setting code of the fixed memory are connected to (m-1) inputs of a reverser whose control input receives a a control signal polarity code. There are m control units, and the control input of each control unit is connected to the output of the corresponding pulse-width modulator, while the polarity setting inputs of the (m-1) control units are connected to the (m-1) reverser outputs. The outputs of each control unit are connected to the inputs of a corresponding switching unit whose output is connected to a corresponding winding of the synchronous motor; an m-phase transformer is connected to m-phase a.c. supply mains, the output windings of said transformer being connected to the power inputs of the corresponding switching units.
The output windings of the m-phase transformer are connected to the m-phase rectifier whose output is connected to a filter whose output is connected to the power inputs of the switching circuits built around unidirectional solid-state switches.
The reverser also comprises (m-1) inputs connected respectively to the corresponding outputs of the pulse-width modulators and (m-1) outputs connected to the corresponding control inputs of the control units.
In this case the mth code presetting output of the fixed memory is connected to the polarity setting input of the corresponding control unit.
Formation of a required perpendicular orientation of the magnetic fields of the stator and rotor of the synchronous motor, at which maximum torque is obtained, in the prior art electric drive is effected by rectifying the a.c. supply voltage, smoothing the ripples by a filter and subjecting the output voltage to pulse-width modulation through a switching circuit.
The reverser used in this drive is complex since it is based on (2m-2) multiplexers, in which case the reverse of the drive is accompanied by chaotic changes of the torque due to disurbance of mutual orientation of the magnetic fields of th
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Chushenkov Igor M.
Matjukhina Ljudmila I.
Mikhalev Alexandr S.
Sidoruk Sergei N.
Belorussky Gosudarstvenny Universitet Imeni V.I. Lenina
Martin David
Shoop Jr. William M.
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