Back to results
US 5,675,699 AGranted
Motor controller
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsMunenori Yamamoto, Takayuki Kifuku, Shunichi Wada
Life of this patent
Estimating the term…
Abstract
A motor controller is provided which improves response to control inversion of a motor, and which also improves controllability and driving comfort when applied to electric power steering. In the motor controller a bridge circuit 5 is formed which includes switching elements 3a to 3d which are driven to control the motor 2 in a direction of conduction, a drive system is switched between a single-phase one-sided chopper system and either a single-phase double-sided chopper system or a double-phase double-sided chopper system based on detected states of an apparatus or the amount of control, so as to control the motor 2 with a drive system suitable for each state of the apparatus.
Claims8
A motor controller comprising:
- a motor connected as a load to a bridge circuit formed of four switching elements;
- detection means for detecting various states of an apparatus;
- and
- control means for controlling said motor to a desired motor current by obtaining the amount of control based on the result of detection by said detection means and by operating two pairs of the switching elements of said bridge circuit based on the amount of control, wherein said control means comprises drive system switching means for switching a drive system between a single-phase double-sided chopper system in which one of the two pairs of switching elements is driven by a PWM drive signal in a desired direction of conduction and the other pair of switching elements is turned off when the result of detection or the amount of control falls below a predetermined value and a single-phase one-sided chopper system in which one switching element of one of the two pairs of switching elements is driven by a PWM drive signal in a desired direction of conduction, the other switching element of said one of the two pairs of switching elements is turned on continuously, and the other pair of switching elements is turned off when the result of detection or the amount of control exceeds the predetermined value.
1 more element
A motor controller comprising:
- a motor connected as a load to a bridge circuit formed of four switching elements;
- detection means for detecting various states of an apparatus;
- and
- control means for controlling said motor to a desired motor current by obtaining the amount of control based on the result of detection by said detection means and by operating two pairs of the switching elements of said bridge circuit based on the amount of control, wherein said control means comprises drive system switching means for switching a drive system between a double-phase double-sided chopper system in which one of the two pairs of switching elements is driven by a PWM drive signal in a desired direction of conduction and the other pair of switching elements is driven by an inverted signal of the drive signal when the result of detection or the amount of control falls below a predetermined value and a single-phase one-sided chopper system in which one switching element of one of the two pairs of switching elements is driven by a PWM drive signal in a desired direction of conduction, the other switching element of said one of the two pairs of switching elements is turned on continuously, and the other pair of switching elements is turned off when the result of detection or the amount of control exceeds the predetermined value.
1 more element
A motor controller comprising:
- a motor connected as a load to a bridge circuit formed of four switching elements;
- detection means for detecting various states of an apparatus;
- and
- control means for controlling said motor to a desired motor current by obtaining the amount of control based on the result of detection by said detection means and by operating two pairs of the switching elements of said bridge circuit based on the amount of control, wherein said control means comprises drive system switching means for switching a drive system among a double-phase double-sided chopper system in which one of the two pairs of switching elements is driven by a PWM drive signal in a desired direction of conduction and the other pair of switching elements is driven by an inverted signal of the drive signal when the result of detection or the amount of control falls below a first predetermined value, a single-phase double-sided chopper system in which one switching element of one of the two pairs of switching elements is driven by a PWM drive signal in a desired direction of conduction and the other pair of switching elements is turned off when the result of detection or the amount of control exceeds the first predetermined value and falls below a second predetermined value greater than the first predetermined value, and a single-phase one-sided chopper system in which one switching element of one of the pairs of switching elements is driven by a PWM drive signal in a desired direction of conduction, the other switching element of said one of the pairs of switching elements is turned on continuously, and the other pair of switching elements is turned off when the result of detection or the amount of control exceeds the second predetermined value.
1 more element
Dependencies are inferred from the claim text.