THESIS
2022
1 online resource (x, 57 pages) : illustrations (some color)
Abstract
An electrical direct drive system with controllers, sensors, and actuators is proposed to replace
conventional gym equipment. Replacing the heavy, redundant iron box with a light and intelligent
direct drive system has become an unstoppable trend. Compared with QDD system, DD system
can obtain durable torque output and a more accurate torque control with lower cost by removing
the gear box. The proposed DD system includes a) The electro-mechanical system, with a straightskew
large torque SPMSM, angle, current and temperature sensors, b) multiple conventional and
customized training modes stored in the controllers, c) a fast response current, speed, and angle
controller.
A Dead-zone Current Calculation (DCC) method is designed to increase the current controllers’
bandwidth with limited h...[
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An electrical direct drive system with controllers, sensors, and actuators is proposed to replace
conventional gym equipment. Replacing the heavy, redundant iron box with a light and intelligent
direct drive system has become an unstoppable trend. Compared with QDD system, DD system
can obtain durable torque output and a more accurate torque control with lower cost by removing
the gear box. The proposed DD system includes a) The electro-mechanical system, with a straightskew
large torque SPMSM, angle, current and temperature sensors, b) multiple conventional and
customized training modes stored in the controllers, c) a fast response current, speed, and angle
controller.
A Dead-zone Current Calculation (DCC) method is designed to increase the current controllers’
bandwidth with limited hardware condition. To further increase the torque control accuracy, the
cogging torque is analyzed and anti-cogging algorithms such as VCT are applied. A fast response
current controller is the basis of a high-performance DD system.
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