<p>The amplitude of a swing powered by an electric motor is controlled by detecting a peak voltage induced in the motor coil by the swing motion when the motor is not being powered and comparing the detected voltage with a one of a set of pre-measured reference values of peak voltages obtained at corresponding amplitude settings to provide a signal to a motor controller which adjusts the power supplied to the motor to bring the swing amplitude to. The motor controller supplies a PWM signal voltage to power the motor and adjusts the voltage on-time to bring or restore the swing to the selected amplitude.</p>
申请公布号
WO2008131449(A2)
申请公布日期
2008.10.30
申请号
WO2008US61353
申请日期
2008.04.23
申请人
MAX TECHNOLOGY CAPITAL LTD;TING, BERNIE;TSE, YAU, CHO;CHAN, CHI FAI