Motor controller and steering device
A technology of motor controller and motor, which is applied in the direction of controlling electromechanical brakes, control systems, steering mechanisms, etc., and can solve problems such as driver discomfort
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no. 1 example
[0045] The first embodiment will be described with reference to the drawings. figure 1 It is a block diagram showing the structure of the steering equipment. FIG. 2 is a block diagram showing the structure of a motor controller for an electric motor (referred to as a motor) applied to a steering apparatus. In this embodiment, a steering device having a transmission ratio changing mechanism will be described as a steering device for changing the rotation transmission ratio between the steering angle of the steering wheel and the rotation angle of the steering wheel in accordance with the vehicle speed. For example, the rotation transmission ratio of the transmission ratio changing mechanism is controlled by the steering device so that when the vehicle is stopped or moving at a low speed, the turning angle of the steering wheel is greater than the steering angle of the steering wheel, thereby reducing the amount of operation of the steering wheel by the driver. On the other hand, w...
no. 2 example
[0113] The second embodiment will be described. In this embodiment, the inverter 30 is constructed by MOSFETs (T1, T2, T3, T4, T5, T6) having electrical characteristic values within a predetermined range.
[0114] MOSFETs (T1, T2, T3, T4, T5, T6) are divided into a plurality of groups, in which the range of the threshold voltage Vth of the MOSFET or the range of the parasitic capacitance C of the MOSFET is different, and the converter 30 consists of the same group MOSFET (T1, T2, T3, T4, T5, T6) is constructed. Therefore, the deviation of the electrical characteristic values of the MOSFETs (T1, T2, T3, T4, T5, T6) constituting the inverter 30 can be suppressed, and the waveforms of the respective phases generated by the inverter 30 can be made consistent with each other, so that the rotation can be suppressed. The surge of the moment current Iq and the torque change of the motor 5 can be suppressed.
[0115] It is not necessary to perform grouping of MOSFETs (T1, T2, T3, T4, T...
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