Meidensha Corporation

Toru Kakebayashi

Takashi Yamaguchi

Yugo Tadano

Takashi Okitsu

Daiki Matsuhashi

Yukimasa Hisamitsu

A LPF extracts DC component of a current detection value of an inverter input current. A subtracting sectioncalculates a difference between a current command value and the DC component of the current detection value. A current controllerproduces two-phase PWM signals Sa and Sb complementary to each other, from the current difference. Further, an integrating circuitintegrates output terminal voltages Vu, Vv and Vw of the inverter to convert the output terminal voltages Vu, Vv and Vw into a magnetic-flux information &#x3a6;u, &#x3a6;v and &#x3a6;w. A logic conversion sectionconverts the magnetic-flux information &#x3a6;u, &#x3a6;v and &#x3a6;w into 120-degree conduction patterns S'-S&#x2032; to output the 120-degree conduction patterns S&#x2032;-S&#x2032;. Then, a logic circuit sectionexecutes a logic synthesis between the PWM signals Sa and Sb and the 120-degree conduction patterns S&#x2032;-S&#x2032; to output gate signals S-S

Inverter control system

A motor drive device including a battery; switching elementsandwhich are connected in series with a condenser Chaving a voltage Vdc resulting from an increase action of battery voltage and which are operated in a chopper control; a reactor Lwhose one end is connected with a common connection point of the switching elementsand; and an inverterfor driving a PM motorwhich is connected between another end of the reactor Land a negative-pole terminal of the battery. In such a motor drive device, an electrical power W is determined based on the voltage Vdc of positive-side point P of the condenser C, a current Idc flowing in the reactor L, and a switching duty dof the switching elementwhich satisfies a condition of 0&#x2266;d&#x2266;1, i.e., is determined by calculating Vdc&#xb7;d&#xb7;Idc.

Electrical power control device and electrical power calculation method in electrical power control device

Accurate power consumption is calculated without raising cost, or making the device bigger. Power consumption (P) upon driving a motor is calculated from an input voltage (Vdc), a switching duty factor of a switching device (SW) of a chopper circuit (ch), which is provided with the switching device (SW) and a reactor (Ldc), a reactor current (Idc), motor winding reactance (L), and motor rotation speed (N), in a motor driving device wherein: the input voltage (Vdc) inputted to the chopper circuit (ch) is stepped down by the chopper circuit (ch); DC power outputted by the chopper circuit (ch) is converted to AC power by driving an inverter (INV) with 120-degree conduction, and outputted to a motor (M); and surge voltage to be generated when the inverter (INV) undergoes commutation is clamped to the input voltage (Vdc), by a diode (D) connected in inverse-parallel to the chopper circuit (ch).

Power-consumption calculating method of motor driving device, and control method of motor driving device using the power-consumption calculating method

Disclosed is a current source inverter device which controls the power factor in an arbitrarily configurable manner without a magnetic pole position detector. The device is provided with a current source inverter; a motor supplied with alternating current power from the current source inverter; and a control means which detects the terminal voltage of the motor, calculates the motor's internal induced voltage and the motor current that flows in the motor based on the detected terminal voltage, and controls the current source inverter. The control means calculates the phase difference (&#x3b8;c) between the terminal voltage and the motor current, the phase difference (&#x3b8;x) between the motor current and the internal induced voltage, and the phase difference (&#x3b8;v) between the terminal voltage and the internal induced voltage. An adjustment angle (&#x3b8;&#x3b1;), which is the error in the phase difference between the motor current and the internal induced voltage when the set value of the phase difference (&#x3b8;x) is &#x3b8;y, is obtained from the conditional equation &#x3b8;&#x3b1;=&#x3b8;v&#x2212;&#x3b8;y&#x2212;&#x3b8;c.

Current source inverter device

In a rotor structure of a permanent magnet type rotary machine comprising a cylindrical permanent magnetfixed on an outer peripheral surface of a rotor shaft, wherein torque acting on the permanent magnetis transmitted to the rotor shaft, the rotor structure further comprises two annular side platesand a holding ring. Each side plate has an axial holeinto which the rotor shaftis fitted so as to rotate with the side plates integrally and the side platesare attached on the both end surface of the permanent magnet, respectively so as to confront with each other. A circular U-shaped groovecoaxially with the axial holeis provided at a end surfacefor facing with the permanent magnetof each side plate. The holding ringis formed cylindrically and covers circumferential sections of the permanent magnetand the side platesand fasten the permanent magnetand the side platesso as to move them integrally.

Rotor structure of permanent magnet type rotary machine

[Task] A high-speed driving is possible, a utilization of a power supply having a low voltage is possible, and a regeneration is easy to be carried out. [Means to solve the task] A first buck-boost chopper portion is provided on an output side of a batteryto boost a voltage across batteryduring a drive of a motor, a second buck-boost chopper portion is provided on an output side of the first buck-boost chopper portion to boost the voltage from an inverter portionduring a regeneration, inverter portionof a 120-degree conduction current source inverter is provided on the output side of the second buck-boost chopper portion, and a motoris provided on an output side of inverter portion

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Tokyo, Japan

Toru Kakebayashi