US 2022/0182003 A1Published application

Motor control device

AssigneeMitsuba Corporation

InventorKazuki IRISAWA

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Abstract

A motor control device including a PWM control part is provided. The PWM control part has a two-phase complementary PWM control part, and when driving opening and closing of an opening/closing body, PWM-controls upper switching elements and lower switching elements of three phases in a three-phase inverter circuit based on an energization mode that sequentially switches among energized phases, which are two of the three phases, and a non-energized phase, which is a remaining one phase. The two-phase complementary PWM control part, in one of the energized phases, controls one of the upper switching element and the lower switching element by a PWM signal, and controls the other by a complementary PWM signal having a polarity opposite to the PWM signal, and, in the non-energized phase, controls one of the upper switching element and the lower switching element to be off, and controls the other by the complementary PWM signal.

Claims9

Dependent claims

A motor control device, which is a motor control device controlling rotation of an electric motor that drives opening and closing of an opening/closing body of a vehicle, the motor control device comprising:

upper switching elements of three phases, respectively connected between a high-potential power supply and output terminals of the three phases connected to the electric motor;
lower switching elements of the three phases, respectively connected between the output terminals of the three phases and a low-potential power supply;
a rotation detection part that detects a rotation position and a rotation speed of the electric motor;
a speed control part that outputs a command value of a PWM duty ratio based on an error between the rotation speed detected by the rotation detection part and a predetermined target rotation speed;
and
a PWM control part that, when driving opening and closing of the opening/closing body, receives the rotation position from the rotation detection part and the command value from the speed control part, and PWM-controls the upper switching elements of the three phases and the lower switching elements of the three phases based on an energization mode that sequentially switches among energized phases, which are two of the three phases, and a non-energized phase, which is a remaining one phase,
wherein the PWM control part has a two-phase complementary PWM control part that
in one of the energized phases, controls one of the upper switching element and the lower switching element by a PWM signal, and controls the other by a complementary PWM signal having a polarity opposite to the PWM signal, and
in the non-energized phase, controls one of the upper switching element and the lower switching element to be off, and controls the other by the complementary PWM signal.

6 more elements

upper switching elements of three phases, respectively connected between a high-potential power supply and output terminals of the three phases connected to the electric motor;
lower switching elements of the three phases, respectively connected between the output terminals of the three phases and a low-potential power supply;
and
a PWM control part, wherein when fixing a position of the opening/closing body at a position in the middle of opening and closing, by PWM-controlling the upper switching elements of the three phases and the lower switching elements of the three phases based on an energization pattern in which two of the three phases are energized phases, and a remaining one phase is a non-energized phase, the PWM control part fixes a rotation position of the electric motor in a direction corresponding to an energization direction of the energized phases,
wherein the PWM control part has a position-fixing PWM control part that
in one of the energized phases, controls one of the upper switching element and the lower switching element by a PWM signal, and controls the other by a complementary PWM signal which has a polarity opposite to the PWM signal, and
in the non-energized phase, controls one of the upper switching element and the lower switching element to be off, and controls the other by the complementary PWM signal.

4 more elements

Dependencies are inferred from the claim text.