초록 ▼

A permanent magnet brushless DC motor controller, and method of operation of the controller, provide effective and smooth regulation of the speed of the motor from zero to above base speed (e.g. at least about 100% above base speed). For a three phase motor the controller comprises three Hall sensor

A permanent magnet brushless DC motor controller, and method of operation of the controller, provide effective and smooth regulation of the speed of the motor from zero to above base speed (e.g. at least about 100% above base speed). For a three phase motor the controller comprises three Hall sensors, a power amplifier comprising a plurality of power electronic switch connected to the motor, two switches (bottom and top) for each phase, and at least an eight bit microprocessor connected to and controlling the switches, and a frequency to voltage controller. The Hall sensors are connected substantially directly to the microprocessor, and also through the frequency to voltage converter. In response to sensing by the Hall sensors, both directly and through the frequency to voltage converter, the microprocessor is used to control the electronic switches to smoothly speed regulate the motor both below and above base speed. Below base speed the microprocessor utilizes a commutation truth table, and the bottom switches provide pulse width modulation, whereas equal to and above base speed the microprocessor uses first and second jump tables, the first jump table comprising the commutation truth table forward rotated one step, and the second jump table the commutation truth table forward rotated two steps.

대표청구항 ▼

[ What is claimed is:] [1.] A method of operating a permanent magnet brushless DC motor having a plurality of Hall sensors for commutation of the motor, a base speed, and an applicable commutation truth table, using at least one jump table based upon the applicable commutation truth table, said meth

[ What is claimed is:] [1.] A method of operating a permanent magnet brushless DC motor having a plurality of Hall sensors for commutation of the motor, a base speed, and an applicable commutation truth table, using at least one jump table based upon the applicable commutation truth table, said method comprising:(a) up to base speed operation, effecting commutation of the motor using the applicable commutation truth table triggered by the Hall sensors, with pulse width modulation switching;(b) above base speed operation, automatically determining a proper time delay between the edge of the most recently triggered Hall sensor and the time to switch to the next commutation step; and(c) automatically regulating motor speed above base speed, utilizing the time delay from (b), and without pulse width modulation switching, by using the at least one jump table.