Motor control device

Patent metadata

Field	Value
Publication number	US-12015361-B2
Application number	US-202017796682-A
Country	US
Kind code	B2
Filing date	Mar 4, 2020
Priority date	Mar 4, 2020
Publication date	Jun 18, 2024
Grant date	Jun 18, 2024

Abstract

A motor control device includes: a step-down device including a DC-output power conversion device having a first mode for outputting first voltage and a second mode for outputting second voltage lower than the first voltage; a power supply device; and a control device, and controls a motor. When a flying object takes off, the control device controls the power conversion device in the first mode. When the control device judges that flight information which is one or both of information of a motor parameter obtained along with control for the motor and information of an environmental factor relevant to the flight altitude of satisfies a predetermined condition, or when the control device has received an mode signal for which the second mode is selected on the basis of the flight information during control for the motor, the control device controls the power conversion device in the second mode.

First claim

The invention claimed is:

1. A motor control device for controlling a motor of a flying object that takes off from a ground and flies, the motor control device comprising:
a step-down device which receives DC power supplied from a DC distribution network as input power and outputs DC power having voltage equal to or smaller than distribution network voltage of the DC distribution network;
a power supply device which converts the DC power to AC power and outputs the AC power to the motor; and
a control device for controlling the step-down device and the power supply device, wherein
the step-down device includes a DC-output power conversion device which converts the input power to DC power having voltage equal to or smaller than the distribution network voltage of the DC distribution network, and an output capacitor for smoothing output voltage of the DC-output power conversion device,
the DC-output power conversion device has a first operation mode for outputting first voltage and a second operation mode for outputting second voltage lower than the first voltage,
when the flying object takes off from the ground, the control device controls the DC-output power conversion device in the first operation mode, and
when the control device judges that flight information which is one or both of information of a motor parameter obtained along with control for the motor and information of an environmental factor relevant to a flight altitude of the flying object satisfies a predetermined condition, or when the control device has received an operation mode signal for which the second operation mode is selected on the basis of the flight information during control for the motor, the control device controls the DC-output power conversion device in the second operation mode.

2. The motor control device according to claim 1 , further comprising an environmental information detection sensor for detecting the information of the environmental factor, wherein
the flight information is the information of the environmental factor,
in a state in which the DC-output power conversion device is controlled in the first operation mode, when the control device judges that an information value based on the information of the environmental factor has passed through a first environmental threshold, the control device controls the DC-output power conversion device in the second operation mode, and
in a state in which the DC-output power conversion device is controlled in the second operation mode, when the control device judges that the information value based on the information of the environmental factor has passed through a second environmental threshold, the control device controls the DC-output power conversion device in the first operation mode.

3. The motor control device according to claim 2 , wherein
the environmental information detection sensor is any of an altitude sensor for detecting altitude information of the flying object, an outside air pressure sensor for detecting outside air pressure information outside the flying object, an air component concentration sensor for detecting air component concentration information outside the flying object, an outside air temperature sensor for detecting outside air temperature information outside the flying object, or a radiation sensor for detecting radiation dose information of radiation showering to the flying object, and
the information of the environmental factor is estimated altitude information obtained by estimating an altitude from any of the outside air pressure information, the air component concentration information, the outside air temperature information, or the radiation dose information detected by the environmental information detection sensor, or is the altitude information detected by the altitude sensor.

4. The motor control device according to claim 2 , wherein
the information of the environmental factor is any of altitude information of the flying object, outside air pressure information outside the flying object, air component concentration information outside the flying object, outside air temperature information outside the flying object, or radiation dose information of radiation showering to the flying object, or complex information generated from a plurality of these kinds of information.

5. The motor control device according to claim 1 , wherein
the flight information is the information of the motor parameter,
in a state in which the DC-output power conversion device is controlled in the first operation mode, when the control device judges that an information value based on the information of the motor parameter is smaller than a first parameter threshold, the control device controls the DC-output power conversion device in the second operation mode, and
in a state in which the DC-output power conversion device is controlled in the second operation mode, when the control device judges that the information value based on the information of the motor parameter is greater than a second parameter threshold greater than the first parameter threshold, the control device controls the DC-output power conversion device in the first operation mode.

6. The motor control device according to claim 5 , wherein
the information of the motor parameter is a motor parameter command for the motor,
the control device includes a motor parameter command sensor for detecting the motor parameter command,
the motor parameter command is any of a motor speed command, a motor output command, a motor AC voltage command, a motor current command, or a motor torque command, or complex information generated from a plurality of these kinds of information, and
the first parameter threshold is a first parameter command threshold, and the second parameter threshold is a second parameter command threshold.

7. The motor control device according to claim 5 , wherein
the information of the motor parameter is motor parameter detected information of the motor,
the motor control device further comprises a motor parameter sensor for detecting the motor parameter detected information,
the motor parameter detected information is any of detected motor speed information, detected motor output information, detected motor AC voltage information, detected motor current information, or detected motor torque information, or complex information generated from a plurality of these kinds of information, and
the first parameter threshold is a first parameter detection threshold, and the second parameter threshold is a second parameter detection threshold.

8. The motor control device according to claim 5 , wherein
the information of the motor parameter is motor parameter estimated information of the motor,
the control device includes an observer for outputting the motor parameter estimated information,
the motor parameter estimated information is any of estimated motor speed information, estimated motor output information, or estimated motor torque information, or complex information generated from a plurality of these kinds of information, and
the first parameter threshold is a first parameter estimation threshold, and the second parameter threshold is a second parameter estimation threshold.

9. The motor control device according to claim 1 , further comprising an environmental information detection sensor for detecting the information of the environmental factor, wherein
the flight information is the information of the motor parameter and the information of the environmental factor,
in a state in which the DC-output power conversion device is controlled in the first operation mode, when the control device judges that an information value based on the information of the environmental factor has passed through a f

Assignees

• Mitsubishi Electric Corp
• Japan Aerospace Exploration

Inventors

• Fujiwara Kenji
• Fukumoto Hisatoshi
• Takegami Tomoki
• Kojima Tetsuya
• Iwata Akihiko
• Sugahara Masahiro
• Kobayashi Hiroshi
• Nishiyama Mari
• Nishizawa Akira

Classifications

• H02M7/537

  using semiconductor devices only, e.g. single switched pulse inverters · CPC title

• H02M3/158

  including plural semiconductor devices as final control devices for a single load · CPC title

• B60L2200/10

  Air crafts · CPC title

• B60L50/52

  characterised by DC-motors · CPC title

• H02K11/33

  Drive circuits, e.g. power electronics (H02K11/38 takes precedence) · CPC title