Title:
MOTOR DRIVE DEVICE AND ELECTRIC DEVICE USING SAME
Document Type and Number:
WIPO Patent Application WO/2014/141345
Kind Code:
A1
Abstract:
A motor drive device (22) includes: a rectifying and smoothing circuit (2) for rectifying the inputted AC current to DC current; and an inverter (3) for converting DC current output from the smoothing circuit (2) to three-phase AC current and driving a brushless DC motor (4). The motor drive device (22) further includes: a position detector (5) for detecting the rotational position of the brushless DC motor (4); and a speed estimation unit (7) for estimating the driving speed of the brushless DC motor (4) from a signal detected by the position detector (5).
The motor drive device (22) still further includes: a PWM setting unit (10) for setting the on-duty and carrier frequency using pulse width modulation on the basis of the driving speed such that the carrier frequency is reduced to lower than the carrier frequency having an on-duty greater than a prescribed value by maintaining a constant PMW minimum pulse width when the on-duty is lower than a prescribed value; and a waveform generation unit (11) for generating a driving waveform for the inverter (3) by superimposing the on-duty and the carrier frequency set by the PWM setting unit onto the rotational position and the driving speed.
Inventors:
TANAKA HIDEHISA
TAKEOKA YOSHINORI
TAKEOKA YOSHINORI
Application Number:
PCT/JP2013/007535
Publication Date:
September 18, 2014
Filing Date:
December 24, 2013
Export Citation:
Assignee:
PANASONIC CORP (JP)
International Classes:
H02P6/06; H02P6/08; H02P6/16; H02P6/17; H02P6/18; H02P6/182; H02P6/21
Foreign References:
| JP2012222842A | 2012-11-12 | |||
| JP2000316294A | 2000-11-14 |
Attorney, Agent or Firm:
NAITO, Hiroki et al. (JP)
Hiroki Naito (JP)
Hiroki Naito (JP)
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