Driving device for electric machine
A technology for motor driving and driving objects, applied in starting devices, single motor speed/torque control, electronic commutator, etc. Uneven position, etc.
Inactive Publication Date: 2005-06-22
SEIKO EPSON CORP
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Problems solved by technology
[0005] However, in the case of sensorless control based on the counter electromotive force voltage, the above-mentioned low-speed control cannot be performed, and the effect is not good when repeated stop and start drive control
In addition, low-speed control can also be performed by using the control method of the Hall element, but the accuracy of the control is affected by the error of the commutation sequence due to the unevenness of the magnetic pole distribution width of the rotor magnetic pole and the uneven installation position of the Hall element. , the action of the back electromotive voltage within the detectable speed range, the sensorless control based on the back electromotive voltage presents a stable state because it does not contain the above error, it is desired to have a driving method that can be controlled even at low speeds, and can More precise control of motors
Method used
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[0044] Specifically, the brushless motor 1 is a three-phase brushless motor in which three stator windings of U-phase, V-phase and W-phase are star-connected. The driving device 10 has an inverter 11, and each output terminal of the inverter 11 It is connected to each terminal of U-phase to W-phase of the brushless motor 1 . The inverter 11 has, for example, a well-known structure in which three sets of connected transistors on the power supply side and transistors on the ground side correspond to U-phase to W-phase. Off is controlled by the commutation signal supplied from the commutation control circuit 12 , whereby the respective phases of the brushless motor 1 are sequentially excited and rotationally driven.
[0045] The rotating shaft of the brushless motor 1 is connected to the paper feeding mechanism of the printer by means of a gear mechanism not shown in the figure. By driving and controlling the brushless motor 1, the rotational force of the brushless motor 1 is tra...
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The motor drive device according to the present invention rotates and drives the motor by switching the excitation phase according to the position of the rotor of a brushless DC motor or a stepping motor to perform commutation control. A motor drive device according to an embodiment of the present invention includes a position detector that outputs a pulse signal as the object to be driven by the motor moves; and a commutator that performs commutation control on the motor based on the pulse signal from the position detector. means of control. In this way, the control can be performed even at low speeds, and the purpose of more precisely controlling the motor can be achieved.
Description
technical field [0001] The present invention relates to a drive device for a motor, which controls the commutation by switching the excitation phase according to the position of the rotor of a brushless DC motor or a stepping motor, thereby driving the motor to rotate, and particularly relates to the use of a position detector to control the motor. A motor drive device that detects the position of the driven object and controls the commutation of the motor. Background technique [0002] As a technique for detecting the rotor position of a motor using a permanent magnet in the rotor like a brushless DC motor or a stepping motor, conventionally, a back electromotive voltage generated in an open phase (non-energized phase) of a stator winding is used. That is, the counter electromotive voltage obtained from the excitation coil is detected, and the zero-crossing point where the detected counter electromotive voltage intersects with the neutral point voltage is obtained to detect...
Claims
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IPC IPC(8): H02P6/08H02P6/06
CPCH02P6/20H02P6/30
Inventor 池上昭彦宫崎新一
Owner SEIKO EPSON CORP