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System and method for starting synchronous motor

A technology of synchronous motor and permanent magnet synchronous motor, which is applied in the direction of motor generator control, control system, control generator, etc., and can solve the problems of increasing system complexity and cost

Pending Publication Date: 2018-05-22
MICROCHIP TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods add complexity and cost to the system

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  • System and method for starting synchronous motor

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Embodiment Construction

[0022] The present invention relates to the starting of a three-phase permanent magnet synchronous machine (PMSM) under field oriented control ("FOC"). The FOC vector control of the motor is a control method that characterizes the stator current of the three-phase AC motor through the magnetic flux and its torque of the motor. With the FOC method, one of the fluxes (rotor, stator or air gap) is considered as a reference for creating a frame of reference for one of the other fluxes, with the aim of decoupling the torque and flux producing components of the stator current. This decoupling helps to ensure easy control of complex 3-phase motors in the same way as DC separate excitation motors. Armature current can be used for torque generation and excitation current can be used for flux generation. In some applications, the rotor flux can be considered as a frame of reference for the stator and air gap fluxes. The principle of FOC is discussed in relevant literature, including s...

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Abstract

The invention relates to a system and method for starting a synchronous motor. According to the system and method for starting the synchronous motor of the invention, in order to avoid a control faulton a windmill-type rotating PMSM (permanent magnet synchronous motor) during startup, an initial speed and position are determined before the startup. A controller uses an FOC (field-orientated control) routine having a speed PI control loop, weak field control, a current PI control loop, and a speed observer; when the controller receives an instruction to start the PMSM, the controller delays startup and executes an estimation phase; during the estimation phase, the controller executes the FOC routine with the speed PI control loop and the weak field control disabled; the estimation phase isrepeated a plurality of times, and estimated values converge towards an actual speed and position through successive iteration; when an estimated speed and position value are stabilized, the estimated values are adopted as the initial speed and position for driving the PMSM, so that the motor can be started; and after the speed PI control loop and the weak field control are enabled, the FOC routine is used to drive the PMSM.

Description

technical field [0001] This disclosure generally relates to the starting of synchronous motors that tend to rotate prior to starting, and more particularly to three-phase permanent magnet synchronous motors (PMSMs) that do not have an initial position for receiving information about their rotors ( angle) and / or rotational speed information, but the PMSM can windmill when activated. Background technique [0002] Permanent magnet synchronous motors (PMSM) are the most common choice of equipment manufacturers due to their high power density, fast dynamic response and high efficiency compared to other motors in their class. In PMSM, the rotor field speed must be equal to (ie, synchronized with) the stator (armature) field speed. A lack of synchronization between the rotor and stator fields can cause the motor to stop, so knowing the speed and position of the rotor is critical to avoid control failures in such motors. Conventional methods of determining the position and speed o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/34H02P21/13
CPCH02P21/13H02P1/029H02P6/18H02P21/0089H02P21/10H02P21/34H02P6/181H02P21/18H02P6/04H02P21/0021
Inventor 王微子
Owner MICROCHIP TECH INC