US Patent No. 9,722,529

CONTROL FOR PULSE WIDTH MODULATED DRIVEN MOTORS


Patent No. 9,722,529
Issue Date August 01, 2017
Title Control For Pulse Width Modulated Driven Motors
Inventorship Christian Paintz, Erfurt (DE)
Assignee MELEXIS TECHNOLOGIES NV, Tessenderlo (BE)

Claim of US Patent No. 9,722,529

1. A method for assisting in operating a PWM driven motor, the method comprising, during at least a certain period in time,
the following steps for at least one phase of the brushless DC motor:
generating, for a given/measured rotor position, a pulse width modulated phase voltage scheme according to a desired phase
profile with a base scaling factor,

by time multiplexing a first pulse and at least one further pulse within a pulse width modulation period of the phase,
the first pulse having a pulse width according to a first phase profile, for that rotor position, multiplied with a first
scaling factor, the first phase profile being in phase with the desired phase profile, and

the at least one further pulse having a pulse width that corresponds with at least one further phase profile, for that rotor
position, multiplied with a further scaling factor, the at least one further phase profile being not in phase with the desired
phase profile,

whereby the first pulse and the at least one further pulse are positioned within the pulse width modulation period of the
phase in at least partially non-overlapping way, and whereby a combination between the multiplication of the first phase profile
and the first scaling factor and the multiplication of the at least one further phase profile and the further scaling factor
corresponds with the multiplication of the desired phase profile with the base scaling factor,

wherein said method furthermore comprises, prior to said generating, determining the first phase profile and the at least
one further phase profile by decomposing the desired phase profile comprising the base scaling factor, into the first phase
profile which is multiplied with the first scaling factor and the at least one further phase profile which is multiplied with
the further scaling factor, whereby the first profile is in phase with the desired phase profile, and whereby the at least
one further profile is not in phase with the desired phase profile,

wherein the method further comprises applying a voltage by a voltage generation unit according to the pulse width modulated
phase voltage scheme.