Research on Closed-Loop Drive System of Two-Phase Hybrid Step Motor Based on SVPWM

Lü, Wei; Wang, Quanwu; Ji, Kehui; Dong, Hairong; Lin, Jing‐Yuan; Jie, Qian

doi:10.1109/vppc.2016.7791764

Cited by 10 publications

(3 citation statements)

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“…The proposed method achieves a very low static error both in load (0.05 ± 1.3 mrad) and no-load (0.09 ± 1.4 mrad) conditions, as measured in the experiment reported in Section 4.4). This error can be compared, for example, to those obtained by similar closed loop controllers described in [19] and [20], where static errors of 0.5 • (~8 mrad) and 0.2 • (3.5 mrad) are reported, respectively. The position error present during constant velocity movement (see experiment 4.4) is similar or lower to that shown in Figure 5 of [11], where a different FOC closed loop controller for stepper motors is presented.…”

Section: Discussionmentioning

confidence: 98%

Simple Torque Control Method for Hybrid Stepper Motors Implemented in FPGA

Ricci

Meacci

2018

Electronics

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Stepper motors are employed in a wide range of consumer and industrial applications. Their use is simple: a digital device generates pulse-bursts and a direction bit towards a power driver that produces the 2-phase currents feeding the motor windings. Despite its simplicity, this open-loop approach fails if the torque load exceeds the motor capacity, so the motor and driver should be oversized at the expense of efficiency and cost. Field-Oriented closed-loop Control (FOC) solves the problem, and the recent availability of low cost electronics devices like Digital Signal Processors, Field Programmable Gate Arrays (FPGA), or even Microcontrollers with dedicated peripherals, fostered the investigation and implementation of several variants of the FOC method. In this paper, a simple and economic FOC torque control method for hybrid stepper motors is presented. The load angle is corrected accordingly to the actual shaft position through pulse-bursts and direction commands issued towards a commercial stepper driver, which manages the 2-phase winding currents. Thanks to the FPGA implementation, the control loop updates the electrical position every 50 μs only, thus allowing a load angle accuracy of −1/100 rad for a rotor velocity up to 750 rev/min, as shown in the reported experiments.

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Section: Discussionmentioning

confidence: 98%

Simple Torque Control Method for Hybrid Stepper Motors Implemented in FPGA

Ricci

Meacci

2018

Electronics

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“…Traditional openloop control can lead to momentary step loss or position error when the load changes. As a result, the stepper motor drive system for position and speed control loops has been gradually enhanced as a closed-loop control [1][2][3][4][5]. In Ref.…”

Section: Introductionmentioning

confidence: 99%

“…In Ref. [1], PI controllers are applied for the current and speed closed-loop control, and P control for the position control loop. For Ref.…”

Section: Introductionmentioning

confidence: 99%

FPGA-Based Hybrid Stepper Motor Drive System Design by Variable Structure Control

et al. 2021

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A stepper motor is usually operated in position open-loop control for simplicity. However, in order to improve the transient and steady-state performances of the stepper motor-based drive system, a high performance stepper motor drive system is usually designed to feed the encoder signal back to form a closed-loop system such as a general servo motor drive, and high-performance position and speed loop controller can then be used to overcome the nonlinear characteristics of the motor, such as the cogging force and impacts from external load. On the other hand, the existed cogging force of the hybrid stepper motor must be solved to increase the positioning precision. The variable structure control (VSC) is insensitive to the bounded uncertainty and load disturbance, and has been known as a high-performance controller. A predefined sliding surface is used to shape the system performances, and incorporate with switching control to achieve the robustness property. Thus, we applied the VSC to implement the stepper motor drive system about the position and speed control, and the switching control is used to overcome the cogging force. The field programmable gate array (FPGA) is a good alternative to be used to realize a motor drive system by considering its programmable ability and diverse designing environment. It is easily developed as an intellectual property (IP) for future use or combined as a part of a large control system. This paper showed the procedures to develop the hardware circuits for the variable structure controller, and applied it to stepper motor position and velocity control. Functions such as PI controllers, dq-axis transformation and two-phase space vector space vector modulation (SVPWM) designed for the stepper motor drives are also shown in the paper. The system simulation and hardware circuit realization are based on MATLAB/Simulink, and realized on Altera FPGA. Simulations on MATLAB/Simulink with trapezoidal velocity profile command, and experiments with and without the load added are shown to demonstrate the hardware performances and correctness.

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