초록 ▼

According to the present invention, there is provided a harmonically suppressed driver for a three phase full bridge pulse width modulated (PWM) inverter, for driving an AC motor. The driver generates three phase PWM waveforms for operating a motor in a speed range of from approximately 240 to 4000

According to the present invention, there is provided a harmonically suppressed driver for a three phase full bridge pulse width modulated (PWM) inverter, for driving an AC motor. The driver generates three phase PWM waveforms for operating a motor in a speed range of from approximately 240 to 4000 rpm. Below 1800 rpm, voltage reduction is implemented by phase shifting in order to maintain constant volt-sec operation and prevent armature flux saturation. Additional load dependent flux compensation is achieved by measuring motor speed, calculating the slip and providing compensation at large slips.

대표청구항 ▼

A harmonically suppressed driver for use with an AC motor comprising: (a) means for storing at least one cycle of a pulse width modulated wave form in the form of successive digital signals; and (b) means for sequentially accessing successive ones of said digital signals at a pre-determined rate; (c

A harmonically suppressed driver for use with an AC motor comprising: (a) means for storing at least one cycle of a pulse width modulated wave form in the form of successive digital signals; and (b) means for sequentially accessing successive ones of said digital signals at a pre-determined rate; (c) inverter means for receiving said sequentially accessed signals and controlling current flow through one or more coils of said AC motor in response thereto producing a current flow through said one or more coils in the form of a harmonically suppressed sine wave; (d) wherein said means for sequentially accessing said successive digital signals is comprised of a slave microprocessor repeatedly executing a program loop for accessing said digital signals and applying said accessed signals to said inverter means, said program loop being characterized by a pre-determined number of slave microprocessor internal clock cycles which define the synchronous speed of rotation of said AC motor.