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Title: A high speed high precision linear drive system for manufacturing automation
Authors: Tam, MSW
Cheung, NC 
Keywords: Acceleration control
Cascade control
Electric control equipment
Linear synchronous motors
Machine control
Manufacturing industries
Permanent magnet motors
Process control
Synchronous motor drives
Velocity control
Issue Date: 2001
Source: APEC 2001 : Sixteenth Annual Applied Power Electronics Conference and Exposition : 4-8 March, 2001, Disneyland Hotel, Anaheim California, p. 440-444 How to cite?
Abstract: High speed and high precision linear motions are found in many industrial applications, such as the wire-bonding and die-bonding of microelectronic components. In order to achieve the tight requirements of future-generation semiconductor packaging machines, a high-performance linear drive system is developed. The linear drive system consists of linear permanent magnet synchronous motors (LPMSM) and a DSP-based fully digital PWM drive. To achieve high trajectory accuracy, a dual-rate multi-loop cascade control structure with velocity and acceleration feed-forward is employed. Also, a velocity observer is used to provide reliable and ripple free feedback information. To increase the current dynamics, overrated momentary high-voltage and high-current are injected to the actuator's coils, through the PWM drive. Finally, to reduce mechanical resonance during the high-speed start-stop operations, a third-order profile generator is developed and employed in the motion path generation process. This paper describes the development of such a linear drive system. The paper includes: (i) the construction and modeling of the permanent magnet synchronous linear drive; (ii) the simulation of the linear drive and the control system; (iii) the design and hardware implementation of the linear drive system; and (iv) the implementation result. The final result shows that the system is capable of 15 G acceleration and 1 micron position accuracy
ISBN: 0-7803-6618-2
DOI: 10.1109/APEC.2001.911684
Appears in Collections:Conference Paper

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