Torque fluctuation suppression control device
A technology for suppressing control and torque fluctuations, applied in the field of torque fluctuation suppression control devices, can solve problems such as vibration and noise, affecting control accuracy, steering wheel vibration, etc., and achieve the effect of reducing or eliminating torque fluctuations
Inactive Publication Date: 2016-08-24
谭方平 +1
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Problems solved by technology
The motor generally drives the load indirectly through the reduction mechanism, and the torque fluctuation will be amplified and transmitted to the whole system, which will cause vibration at low speed and noise at high speed, causing bad influence
For example, in machine tools in the industrial field, the uneven movement caused by torque fluctuations directly affects the machining accuracy; in new energy vehicles and electric drive systems of automobiles, motor torque fluctuations will cause vibration and noise, especially in electric power steering systems , too much torque fluctuation will make the driver feel the vibration of the steering wheel and affect the driving feeling; the torque fluctuation of the servo control system will affect the control accuracy
Method used
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Embodiment Construction
[0050] The torque fluctuation of surface-mounted permanent magnet synchronous motor has two main components: cogging torque and synchronous torque. Among them, the cogging torque belongs to the unique component of the permanent magnet synchronous motor, and its magnitude does not change with the speed and load. Therefore, the inventor proposes the present invention from the perspective of reducing the synchronous torque.
[0051] The electromagnetic torque formula of the permanent magnet synchronous motor is as follows (taking the three-phase permanent magnet synchronous motor as an example):
[0052] T e =(e a × i a +e b × i b +e c × i c ) / ω
[0053] where e a 、e b 、e c is the three-phase back electromotive force, i a i b i c is the three-phase current of the permanent magnet synchronous motor, T e is the electromagnetic torque of the permanent magnet synchronous motor, and ω is the speed of the permanent magnet synchronous motor.
[0054] Ideally, the three-ph...
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The invention discloses a torque fluctuation restraint control device used for a permanent magnet synchronous motor. The device comprises a d-axis PI control module, a q-axis PI control module, a d-axis voltage calculating module, a q-axis voltage calculating module, a voltage converting module, a revolving speed inducting module, a rotor position inducting module and a feedforward offset voltage calculating module. According to the torque fluctuation restraint control device, the d-axis feedforward offset voltage and the q-axis feedforward offset voltage compensate for the d-axis target voltage and the q-axis target voltage within each period of time, and the counter emf harmonic wave of the permanent magnet synchronous motor and the current harmonic wave of an inverter are eliminated within the period of time.
Description
technical field [0001] The invention relates to the technical field of permanent magnet synchronous motors, in particular to a torque fluctuation suppression control device. Background technique [0002] A motor is an electromagnetic mechanical device that converts electromechanical energy. It is used to convert electrical energy into mechanical energy to drive machinery and devices for various purposes to meet different needs and has a wide range of applications. The types of motors can be divided into two categories: AC motors and DC motors. Among them, the permanent magnet synchronous motor is a relatively new member of the AC motor family. The stator uses multi-phase windings and the rotor uses permanent magnets. It has a series of advantages such as high power density, wide speed range, high efficiency, small interference and small torque fluctuation. Therefore, it gradually replaces other motors in industries such as industrial drives, servo control, office automati...
Claims
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IPC IPC(8): H02P6/10
Inventor 谭方平万新山
Owner 谭方平